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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
#959258#6865. foreverlasting and fried-chickenDa_CapoAC ✓97ms3840kbC++202.8kb2025-03-31 17:08:392025-03-31 17:08:44

Judging History

This is the latest submission verdict.

  • [2025-03-31 17:08:44]
  • Judged
  • Verdict: AC
  • Time: 97ms
  • Memory: 3840kb
  • [2025-03-31 17:08:39]
  • Submitted

answer

// #include <algorithm>
// #include <bitset>
// #include <cctype>
// #include <cerrno>
// #include <clocale>
// #include <cmath>
// #include <complex>
// #include <cstdio>
// #include <cstdlib>
// #include <cstring>
// #include <ctime>
// #include <deque>
// #include <exception>
// #include <fstream>
// #include <functional>
// #include <limits>
// #include <list>
// #include <map>
// #include <iomanip>
// #include <ios>
// #include <iosfwd>
// #include <iostream>
// #include <istream>
// #include <ostream>
// #include <queue>
// #include <set>
// #include <sstream>
// #include <stack>
// #include <stdexcept>
// #include <streambuf>
// #include <string>
// #include <utility>
// #include <vector>
// #include <cwchar>
// #include <cwctype>
#include <bits/stdc++.h>

#define int long long
// #define int __int128
#define fi first
#define se second
#define endl "\n"
#define pb push_back
#define rep(i, a, b) for (int i = a; i <= b; i++)
#define lowbit(x) ((x) & (-x))

using namespace std;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> PII;
typedef pair<int, string> PIS;
typedef pair<ld, int> PDI;

const int N = 1e3 + 10, M = 1e3 + 10, INF = 1e18;
const double eps = 1e-15;
const int mod = 1e9 + 7;
// int mod = 1e9 + 7;

int n, m, k;
int dx[4] = {1, 0, 0, -1}, dy[4] = {0, -1, 1, 0};
int a[N], b[N], c[N];
// int a, b, c;
// double a, b, c;
char op;
int x, y, z, r;
// double x, y, z, r;
string s, s1, s2, str;
// vector<PII> v[N];
int f[N];
bitset<N> adj[N];
int d[N];

int c4(int x)
{
    return (x * (x - 1) * (x - 2) * (x - 3) / 24) % mod;
}
int c2(int x)
{
    return (x * (x - 1) / 2) % mod;
}

void solve(int _)
{

    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        adj[i].reset();
        d[i] = 0;
    }
    for (int i = 0; i < m; i++)
    {
        cin >> x >> y;
        d[x]++, d[y]++;
        adj[x].set(y);
        adj[y].set(x);
    }

    int res = 0;
    for (int i = 1; i <= n; i++)
    {
        for (int j = i + 1; j <= n; j++)
        {
            int s = (adj[i] & adj[j]).count();
            int sa = d[i], sb = d[j];
            if (adj[i].test(j)) // 去掉他们相邻的边
                sa--, sb--;
            if (s < 4)
                continue;
            res = (res + c4(s) * c2(sa - 4) % mod) % mod;
            res = (res + c4(s) * c2(sb - 4) % mod) % mod;
        }
    }

    cout << res << endl;
}

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    // getp(1000000);

    int t = 1;
    cin >> t;
    cout << fixed << setprecision(12);
    // getline(cin, s);

    // while (t--)
    for (int i = 1; i <= t; i++)
    {
        solve(i);
    }

    return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 97ms
memory: 3840kb

input:

9
8 10
1 2
1 3
1 4
1 5
1 6
1 7
8 4
8 5
8 6
8 7
10 12
1 2
1 3
1 4
1 5
1 6
1 7
8 4
8 5
8 6
8 7
8 9
8 10
11 13
1 2
1 3
1 4
1 5
1 6
1 7
8 4
8 5
8 6
8 7
8 9
8 10
1 11
11 14
1 2
1 3
1 4
1 5
1 6
1 7
8 4
8 5
8 6
8 7
8 9
8 10
1 11
1 8
10 45
5 10
2 9
5 8
3 10
2 10
4 9
4 3
4 2
5 6
7 1
10 6
10 7
6 1
8 3
5 1
7 5...

output:

1
2
4
4
37800
0
278229818
23929419
3268272

result:

ok 9 lines