Submission #4033564

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define dump(a) cout << (a) << '\n';
typedef uint64_t Int;
Int mod = 1e9+7;
Int MOD = 998244353;

int main() {
    ios::sync_with_stdio(false);
    Int n, m;
    cin >> n >> m;
    bool am[20][20] = {};
    for (Int i = 0; i < m; i++) {
        Int a, b;
        cin >> a >> b;
        am[a][b] = am[b][a] = true;
    }
    Int res = 0;
    for (Int bit = 0; bit < (1<<n); bit++) {
        vector<Int> v;
        for (Int i = 0; i < n; i++) {
            if (bit & (1<<i)) v.emplace_back(i + 1);
        }
        bool x = true;
        for (Int i = 0; i < (Int)v.size() - 1; i++) {
            for (Int j = i + 1; j < (Int)v.size(); j++) {
                if (!am[i][j]) x = false;
            }
        }
        if (x) res = max(res, (Int)v.size());
    }
    dump(res);
    return 0;  
} 

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