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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#648886#5407. 基础图论练习题lifan0 11ms4244kbC++141.5kb2024-10-17 20:50:122024-10-17 20:50:12

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  • [2024-10-17 20:50:12]
  • 评测
  • 测评结果:0
  • 用时:11ms
  • 内存:4244kb
  • [2024-10-17 20:50:12]
  • 提交

answer

// 
/*
https://www.cnblogs.com/xulongkai/p/18007142
*/
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=5005,mod=1e9+7;
int T;
int n;
bool g[N][N];
int d[N];
int get(char ch){
	if('0'<=ch&&ch<='9'){
		return ch-'0';
	}
	return ch-'A'+10;
}
int s[N],siz[N];
int sum[N][2];
int ans;
void solve(){
	scanf("%lld",&n);
	for(int i=1;i<=n;i++){
		d[i]=siz[i]=0;
	}	
	for(int i=2;i<=n;i++){
		string s;
		cin>>s;
		for(int j=0;j<(i+2)/4;j++){
			for(int k=0;k<4;k++){
				if(j*4+k+1<i){
					int x=get(s[j])>>k&1;
					g[i][j*4+k+1]=x,g[j*4+k+1][i]=!x;
					d[i]+=x,d[j*4+k+1]+=!x;
				}
			}
		}
	}
	for(int i=1;i<=n;i++){
		s[i]=d[i];
		siz[d[i]]++;
	}
	for(int i=1;i<=n;i++){
		siz[i]+=siz[i-1];
	}
	sort(s+1,s+n+1);
	for(int i=1;i<=n;i++){
		s[i]+=s[i-1];
		sum[i][0]=sum[i-1][0]+(s[i]==(i*(i-1)/2));//交换前 
		sum[i][1]=sum[i-1][1]+(s[i]==(i*(i-1)/2+1));//交换后	
	}
	ans=0;
	for(int i=n;i>=1;i--){
		for(int j=i-1;j>=1;j--){
			int x=i,y=j,res=sum[n][0];
			if(g[x][y]){
				swap(x,y);
			}
			if(d[x]>=d[y]){//交换前在同一个强连通分量
				res+=(sum[siz[d[x]]-1][1]-sum[siz[d[y]-1]][1]);
			}
			if(d[x]+1<d[y]){//交换后在同一个强连通分量
				res-=(sum[siz[d[y]-1]][0]-sum[siz[d[x]]-1][0]);
			}
			ans=(ans*2+res)%mod;
		}	
	}
	printf("%lld\n",ans);
}
signed main(){
	scanf("%lld",&T);
	while(T--){
		solve();
	}
	return 0;
}
/*
2
3
0
2
6
1
3
7
F
F1
*/

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 0
Wrong Answer

Test #1:

score: 0
Wrong Answer
time: 11ms
memory: 4244kb

input:

10000
100
1
2
2
8
C0
F0
27
78
AE1
C01
511
D87
EF20
3873
2742
73D0
DC9B0
FB2A3
9C011
9B4E0
95DC00
A7B980
F43531
6A6245
5347BE0
1A6C8A1
88E46D6
64CF3AE
D25F63C1
C894E4C3
1C0AFD73
EC1C3F9A
087CE17C0
22149A380
B28038AF1
B9CA21C7F
D78F5307C1
49045489A2
72C4DE6FD1
7713F40D05
EEE8878EEC1
310E62812B1
DA9D5B...

output:

281603732
13
266795052
371842543
67
0
7359
2
274305004
266338303
901107579
28174
2
699555017
63
1447744
2726
0
482956837
371842543
2093940
34687
7466
4262014
360656728
308924428
989705702
923440739
718165604
86033
285220919
542113286
32032
3899391
624478288
371842543
63
63
115
2097151
268435455
25
4...

result:

wrong answer 3rd numbers differ - expected: '285212672', found: '266795052'

Subtask #2:

score: 0
Skipped

Dependency #1:

0%

Subtask #3:

score: 0
Skipped

Dependency #1:

0%

Subtask #4:

score: 0
Skipped

Dependency #1:

0%

Subtask #5:

score: 0
Skipped

Dependency #1:

0%