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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#327647#833. Cells BlockingpeterAC ✓351ms80112kbC++141.6kb2024-02-15 11:42:372024-02-15 11:42:38

Judging History

你现在查看的是最新测评结果

  • [2024-02-15 11:42:38]
  • 评测
  • 测评结果:AC
  • 用时:351ms
  • 内存:80112kb
  • [2024-02-15 11:42:37]
  • 提交

answer

// Problem: ptz winter 2020 day3 C
// Contest: ptz
// URL: https://qoj.ac/problem/833
// Memory Limit: 512 MB
// Time Limit: 3000 ms

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxn=3005;
bool a[maxn][maxn],f[maxn][maxn],g[maxn][maxn];
vector<int> vec[maxn<<1];
char ch[maxn];

int main(){
	
	int n,m,cnt=0;
	
	scanf("%d %d",&n,&m);
	for(int i=1;i<=n;i++){
		scanf("%s",ch+1);
		for(int j=1;j<=m;j++){
			a[i][j]=(ch[j]=='.');
			cnt+=a[i][j];
		}
	}
	
	f[1][1]=a[1][1];
	g[n][m]=a[n][m];
	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			if(!a[i][j]) continue;
			f[i][j]|=(f[i-1][j]|f[i][j-1]);
		}
	}
	
	if(!f[n][m]){
		printf("%lld\n",1ll*cnt*(cnt-1)/2);
		return 0;
	}
	
	for(int i=n;i>=1;i--){
		for(int j=m;j>=1;j--){
			if(!a[i][j]) continue;
			g[i][j]|=(g[i+1][j]|g[i][j+1]);
		}
	}
	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			if(f[i][j]&&g[i][j]) vec[i+j].push_back(i);
			else a[i][j]=0;
		}
	}
	
	ll res=0;
	
	for(int i=2;i<=n+m;i++){
		if(vec[i].empty()) continue;
		else if((int)vec[i].size()==1){
			cnt--;
			res+=cnt;
		}else{
			if((int)vec[i].size()==2) res++;
			int tl=vec[i][1],tr=vec[i].back();
			for(int j=i+1;j<=n+m;j++){
				if(!a[tl][j-tl]) tl++;
				if(a[tr+1][j-tr-1]) tr++;
				if(tl==tr&&(int)vec[j].size()>1) res++; 
			}
			tl=vec[i][0];
			tr=vec[i][(int)vec[i].size()-2];
			for(int j=i+1;j<=n+m;j++){
				if(!a[tl][j-tl]) tl++;
				if(a[tr+1][j-tr-1]) tr++;
				if(tl==tr&&(int)vec[j].size()>1) res++; 
			}
		}
	}
	
	printf("%lld\n",res);
	
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 8120kb

input:

3 3
...
...
...

output:

17

result:

ok 1 number(s): "17"

Test #2:

score: 0
Accepted
time: 0ms
memory: 8128kb

input:

3 3
.**
.*.
...

output:

15

result:

ok 1 number(s): "15"

Test #3:

score: 0
Accepted
time: 1ms
memory: 8184kb

input:

3 4
****
....
****

output:

6

result:

ok 1 number(s): "6"

Test #4:

score: 0
Accepted
time: 1ms
memory: 8108kb

input:

5 5
*....
.*.*.
*****
*.***
..*..

output:

66

result:

ok 1 number(s): "66"

Test #5:

score: 0
Accepted
time: 1ms
memory: 8032kb

input:

10 10
...***.*..
**...*.***
...***.*..
.**...*.*.
.*****..*.
..*.****.*
.**...****
..*..*.*.*
*.*.**....
....**...*

output:

1378

result:

ok 1 number(s): "1378"

Test #6:

score: 0
Accepted
time: 280ms
memory: 79860kb

input:

3000 3000
.....................................................................................................................................................................................................................................................................................................

output:

17999999

result:

ok 1 number(s): "17999999"

Test #7:

score: 0
Accepted
time: 276ms
memory: 79656kb

input:

3000 3000
...................................................................................................................*......................................................................................................................................................................*..........

output:

17981671

result:

ok 1 number(s): "17981671"

Test #8:

score: 0
Accepted
time: 268ms
memory: 79484kb

input:

3000 3000
.....................................................................................................................................................................................................................................................................................................

output:

17963615

result:

ok 1 number(s): "17963615"

Test #9:

score: 0
Accepted
time: 273ms
memory: 79240kb

input:

3000 3000
.........................................................................................................*...........................................................................................................................................................................................

output:

17945165

result:

ok 1 number(s): "17945165"

Test #10:

score: 0
Accepted
time: 287ms
memory: 79776kb

input:

3000 3000
......................................................................................................................................*........................................................................................................................................*.....................

output:

17928211

result:

ok 1 number(s): "17928211"

Test #11:

score: 0
Accepted
time: 281ms
memory: 79072kb

input:

3000 3000
...........................................*.........................................................................................................................................................................................................................................................

output:

17911522

result:

ok 1 number(s): "17911522"

Test #12:

score: 0
Accepted
time: 305ms
memory: 78936kb

input:

3000 3000
..............................*................................................................................................................*.....................................................................................................................................................

output:

17892283

result:

ok 1 number(s): "17892283"

Test #13:

score: 0
Accepted
time: 284ms
memory: 78892kb

input:

3000 3000
................................................................*....*................................................................................................................................................................................*..............................................

output:

17873837

result:

ok 1 number(s): "17873837"

Test #14:

score: 0
Accepted
time: 271ms
memory: 79044kb

input:

3000 3000
............................................................................................*.............................................................................*.....................................................................................................*....................

output:

17856701

result:

ok 1 number(s): "17856701"

Test #15:

score: 0
Accepted
time: 279ms
memory: 79116kb

input:

3000 3000
......................................*..........................................................................................................................................................*...................................................................................................

output:

17837857

result:

ok 1 number(s): "17837857"

Test #16:

score: 0
Accepted
time: 271ms
memory: 78412kb

input:

3000 3000
.................................................................................................................................................................................................................................*...................................................................

output:

17819731

result:

ok 1 number(s): "17819731"

Test #17:

score: 0
Accepted
time: 254ms
memory: 62644kb

input:

3000 3000
......**.....*.......*.*..........*..*...............**.............*.......*......*........*...*.....*.*.................*......*....*.........*....................*.................*.......................*.......*..*.*.......*.......................*..........*..*......................*...

output:

16202000

result:

ok 1 number(s): "16202000"

Test #18:

score: 0
Accepted
time: 295ms
memory: 46068kb

input:

3000 3000
..................*....*....*...*.*.............*.............*....*.*..*...*...*...*....*.................*...*.*.***...*....*......*.......**...*.......*.*...**...*...*...**.........*..........*.....*.*....*..*.......*.........*..*.....*...............**.......*.....*.*..*.*.*........*.....

output:

21600132

result:

ok 1 number(s): "21600132"

Test #19:

score: 0
Accepted
time: 47ms
memory: 21552kb

input:

3000 3000
..*.**...*...............*........*.*..*.*.....*........*.*..........***..*..*..*..*.*....*...*.*.....***.*...*........*..*.****..*.*....**.......*......*....*..*......*......*..*..*.*..*....*..**.*.......**.*...*....**.....**..*......*...*....*..*.**.*..***...*.....*....***.*........*.......

output:

19862779430431

result:

ok 1 number(s): "19862779430431"

Test #20:

score: 0
Accepted
time: 52ms
memory: 21556kb

input:

3000 3000
.**.**..***....*.*....*..*...*.**.**.**.......*...*........*.**.*...*...**..*...*.*.**.*.*.*.*..*...*.....*.*.**.*.*....*.**.....*..**.**.*....**.**.**..*..**...*...***.**.*.*......**.**.*...****.....***.*..*.**.*......*..**.**.**.....**...*.*..***.******...**....****..***..**.*........*.....

output:

14601805246666

result:

ok 1 number(s): "14601805246666"

Test #21:

score: 0
Accepted
time: 1ms
memory: 8076kb

input:

1 1
*

output:

0

result:

ok 1 number(s): "0"

Test #22:

score: 0
Accepted
time: 1ms
memory: 8188kb

input:

1 1
.

output:

0

result:

ok 1 number(s): "0"

Test #23:

score: 0
Accepted
time: 1ms
memory: 8192kb

input:

2 2
..
..

output:

6

result:

ok 1 number(s): "6"

Test #24:

score: 0
Accepted
time: 52ms
memory: 21624kb

input:

3000 3000
.***..**..*.*.*..*...**.*.**...***.....*..***.***.***.*..***.*......*.**.***.***.*...**.*.*..***.*..*.**..***.....*.*...***.*.***.*...*.*.....***.*..**...*.*..*.******.*.*...**.*..**.**.**.*.**..***.**.***..*......**.***.**.*....*..*.....*...*..*.*..*..*.*...**.**...*..**..***.**..*....*.....

output:

10151159625145

result:

ok 1 number(s): "10151159625145"

Test #25:

score: 0
Accepted
time: 25ms
memory: 21328kb

input:

3000 3000
*******************************************************************************************************************************************************************************************************************************************************.******************************************...

output:

39716328

result:

ok 1 number(s): "39716328"

Test #26:

score: 0
Accepted
time: 278ms
memory: 79980kb

input:

3000 3000
..*..................................................................................................................................................................................................................................................................................................

output:

35988321

result:

ok 1 number(s): "35988321"

Test #27:

score: 0
Accepted
time: 304ms
memory: 79768kb

input:

3000 3000
.....................................................................................................................................................................................................................................................................................................

output:

35981866

result:

ok 1 number(s): "35981866"

Test #28:

score: 0
Accepted
time: 275ms
memory: 79636kb

input:

3000 3000
...**................................................................................................................................................................................................................................................................................................

output:

17988153

result:

ok 1 number(s): "17988153"

Test #29:

score: 0
Accepted
time: 269ms
memory: 79800kb

input:

3000 3000
...*.*...............................................................................................................................................................................................................................................................................................

output:

35969654

result:

ok 1 number(s): "35969654"

Test #30:

score: 0
Accepted
time: 282ms
memory: 79684kb

input:

3000 3000
..*..................................................................................................................................................................................................................................................................................................

output:

17982216

result:

ok 1 number(s): "17982216"

Test #31:

score: 0
Accepted
time: 259ms
memory: 79260kb

input:

3000 3000
....**.*.............................................................................................................................................................................................................................................................................................

output:

71916090

result:

ok 1 number(s): "71916090"

Test #32:

score: 0
Accepted
time: 281ms
memory: 79152kb

input:

3000 3000
....****.............................................................................................................................................................................................................................................................................................

output:

71903186

result:

ok 1 number(s): "71903186"

Test #33:

score: 0
Accepted
time: 287ms
memory: 80040kb

input:

3000 3000
.........*...........................................................................................................................................................................................................................................................................................

output:

17973051

result:

ok 1 number(s): "17973051"

Test #34:

score: 0
Accepted
time: 292ms
memory: 78712kb

input:

3000 3000
.*.......*.............................................................................................................*................................................................................*............................................................................................

output:

35630636

result:

ok 1 number(s): "35630636"

Test #35:

score: 0
Accepted
time: 347ms
memory: 79016kb

input:

3000 3000
.**...........................*..........................................................................................................................................*...........................................................................................................................

output:

44529907

result:

ok 1 number(s): "44529907"

Test #36:

score: 0
Accepted
time: 351ms
memory: 79032kb

input:

3000 3000
....*................................................................................................................................................................................................................................................................................................

output:

53426863

result:

ok 1 number(s): "53426863"

Test #37:

score: 0
Accepted
time: 326ms
memory: 78828kb

input:

3000 3000
..*.*........................................................................*............................*...............*.............................................................................................................................................*........*...................

output:

53419301

result:

ok 1 number(s): "53419301"

Test #38:

score: 0
Accepted
time: 297ms
memory: 78444kb

input:

3000 3000
......*.........*...................................................................................*.....................................................................................................................*................................................*.........................

output:

26705269

result:

ok 1 number(s): "26705269"

Test #39:

score: 0
Accepted
time: 277ms
memory: 78812kb

input:

3000 3000
....*.**....*................*............................*..........*...............................................................................................................................................................................................................................

output:

17799069

result:

ok 1 number(s): "17799069"

Test #40:

score: 0
Accepted
time: 337ms
memory: 78648kb

input:

3000 3000
...***.......................................*...........*.....................*........*...........................................................................................................................................................*................................................

output:

53393629

result:

ok 1 number(s): "53393629"

Test #41:

score: 0
Accepted
time: 275ms
memory: 79780kb

input:

3000 3000
.....................................................................................................................................................................................................................................................................................................

output:

98852811

result:

ok 1 number(s): "98852811"

Test #42:

score: 0
Accepted
time: 1ms
memory: 6244kb

input:

1 3000
........................................................................................................................................................................................................................................................................................................

output:

4498500

result:

ok 1 number(s): "4498500"

Test #43:

score: 0
Accepted
time: 299ms
memory: 78616kb

input:

3000 3000
.*.....*...........................................................................................................*...................................*........................................................................................*............*.......................................

output:

88979547

result:

ok 1 number(s): "88979547"

Test #44:

score: 0
Accepted
time: 320ms
memory: 80112kb

input:

3000 3000
.....................................................................................................................................................................................................................................................................................................

output:

35964327

result:

ok 1 number(s): "35964327"