제출 #246400

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
246400		NONAME	Ronald (COCI17_ronald)	C++14	0 / 120	52 ms	65540 KiB

ronald

#include  <bits/stdc++.h>
#define dbg(x) cerr << #x << " = " << x << "\n"
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie()
using namespace std;
using ll = long long;
using ld = long double;

const int N = 1e4;

int n, m;
bool mk[N];
vector <int> g[N];

void dfs(int v, int pr, int &e, int &cnt) {
    if (mk[v])
        return;

    e += int(g[v].size());
    ++cnt;

    for (int u : g[v])
        if (u != pr)
            dfs(u, v, e, cnt);
}

int main() {
    fast_io;

    cin >> n >> m;
    for (int i = 0; i < m; ++i) {
        int v, u;
        cin >> v >> u;
        --v, --u;

        g[v].push_back(u);
        g[u].push_back(v);
    }

    for (int i = 0; i < n; ++i) {
        if (mk[i])
            continue;

        int e = 0, cnt = 0;
        dfs(i, -1, e, cnt);

        if (e != (cnt * (cnt - 1)))
            return void(cout << "NE\n"), 0;
    }

    cout << "DA\n";
}

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