제출 #714464

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
714464		radal	철인 이종 경기 (APIO18_duathlon)	C++17	0 / 100	72 ms	9916 KiB

count_triplets

#include <bits/stdc++.h>
//#pragma GCC target("sse,sse2,avx2")
#pragma GCC optimize("unroll-loops,O3")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 1e5+20,mod = 998244353,sq = 1000;
constexpr ll inf = 1e9+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}
 
inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k >>= 1;
    } 
    return z; 
}

int n,m;
int h[N];
bool cut[N];
vector<int> G[N];

void dfs(int v){
	for (int u : G[v]){
		if (h[u] != -1) continue;
		h[u] = h[v] + 1;
		dfs(u);
	}
}

int main(){
	ios :: sync_with_stdio(0); cin.tie(0);  cout.tie(0);
	memset(h,-1,sizeof h);
	cin >> n >> m;
	rep(i,0,m){
		int u,v;
		cin >> u >> v;
		G[u].pb(v);
		G[v].pb(u);
	}
	h[1] = 0;
	dfs(1);
	rep(i,1,n+1) if (h[i] == -1) assert(0);
}

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