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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#624851#9353. Interesting PermutationNENULZYAC ✓98ms4512kbC++171.2kb2024-10-09 16:44:342024-10-09 16:44:34

Judging History

你现在查看的是最新测评结果

  • [2024-10-09 16:44:34]
  • 评测
  • 测评结果:AC
  • 用时:98ms
  • 内存:4512kb
  • [2024-10-09 16:44:34]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<long long ,long long > 
ll mod=1e9+7;
ll a[200005];
int checkill(int n){
    if(a[1]!=0) return 0;
    if(a[n]!=n-1) return 0;
    for(int i=1;i<=n-1;i++){
        if(a[i+1]<a[i]||a[i]<i-1) return 0;
    }
    return 1;
}
ll A(ll sumx,ll sumy){
	ll res=1;
	for (ll i=1;i<=sumx;i++){
		res*=sumy;
		res%=mod;
		sumy--;
	}
	return res;
}
void solve() {
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    if (!checkill(n)){
    	cout<<0<<"\n";
    	return;
	}
	//	ll ans=(n-a[2])*2;
	//cout<<"ans "<<ans<<"\n";
	ll ans=2;
	for (int i=3;i<=n;i++){
		if (a[i]==a[i-1]){
			int j=i;
			while(a[j+1]==a[j]);
			ll sumx=j-i+1;
			ll sumy=a[i]-(i-1)+1;
			//cout<<sumx<<sumy<<"\n";
			ans*=A(sumx,sumy);
			ans%=mod;
			i=j;
		}
		else{
			//cout<<"fun\n";
			ans*=2;
			ans%=mod;
		}
	}
	cout<<ans%mod<<"\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t = 1;
    cin >> t;
    for (int i = 1; i <= t; i++) {
        //cout << "Case #" << i << ":";
//        cout<<"n: ";
//        cout<<i<<" \n";
        solve();
    }
    return 0;
}

这程序好像有点Bug,我给组数据试试?

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 3672kb

input:

3
3
0 2 2
3
0 1 2
3
0 2 3

output:

2
4
0

result:

ok 3 lines

Test #2:

score: 0
Accepted
time: 62ms
memory: 4512kb

input:

10039
14
5 6 7 8 9 10 11 12 13 13 13 13 13 13
14
0 5 6 7 8 9 10 11 12 13 14 14 14 14
1
1
14
0 5 4 8 9 10 11 12 13 13 13 13 13 13
45
0 1 1 2 2 3 5 5 6 6 8 9 11 13 15 17 18 18 20 22 22 24 26 26 26 26 27 27 27 28 30 32 32 33 34 34 34 36 36 38 38 38 39 39 44
24
0 2 3 5 7 9 9 10 11 12 13 14 14 14 14 15 1...

output:

0
0
0
0
0
0
24576
0
0
0
0
0
658159182
0
805306368
8
572589350
12288
2
0
981283070
0
0
2
0
0
0
0
4423680
0
0
14155776
16
0
768
0
0
0
855189487
0
2
0
0
0
0
2
0
2
797370259
0
0
0
0
4
0
0
0
301989888
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
192
0
0
12288
0
0
2
8
0
0
495514526
0
0
955131071
768
0
0
147456
0
0...

result:

ok 10039 lines

Test #3:

score: 0
Accepted
time: 98ms
memory: 4380kb

input:

20
100000
0 1 2 3 5 6 7 9 10 10 12 12 12 13 14 15 17 17 18 19 21 22 24 26 28 28 28 28 29 31 32 34 35 36 38 39 39 39 41 41 42 44 45 47 48 49 51 53 54 56 58 58 58 60 62 62 64 64 64 66 66 66 66 68 70 70 71 72 72 74 74 75 76 77 77 78 80 80 82 82 84 85 86 86 88 88 89 90 91 91 93 93 95 97 98 100 101 103 1...

output:

202795881
940225306
406525679
536765675
729062616
366047380
66289678
199278830
570456350
993317415
17778389
674797620
787821942
841428534
632185280
579006079
822641126
664256526
482813708
821188194

result:

ok 20 lines

Test #4:

score: 0
Accepted
time: 0ms
memory: 3664kb

input:

1
14
5 6 7 8 9 10 11 12 13 13 13 13 13 13

output:

0

result:

ok single line: '0'

Test #5:

score: 0
Accepted
time: 0ms
memory: 3592kb

input:

1
14
0 5 6 7 8 9 10 11 12 13 14 14 14 14

output:

0

result:

ok single line: '0'

Test #6:

score: 0
Accepted
time: 0ms
memory: 3652kb

input:

1
1
1

output:

0

result:

ok single line: '0'

Test #7:

score: 0
Accepted
time: 0ms
memory: 3672kb

input:

1
14
0 5 4 8 9 10 11 12 13 13 13 13 13 13

output:

0

result:

ok single line: '0'

Extra Test:

score: 0
Extra Test Passed