제출 #244458

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
244458		dantoh000	Pipes (CEOI15_pipes)	C++14	20 / 100	1288 ms	65540 KiB

pipes

#include <bits/stdc++.h>
using namespace std;
const int mod = 1000000007;
typedef pair<int,int> ii;
int n,m;
vector<int> G[100005];
int num[100005];
int p[100005];
int low[100005];
int ct = 1;
int k[100005];
unordered_map<int,short> M;
int hsh(int u, int v){
    return (k[u]+k[v])%mod;
}

int root;
void dfs(int u){
    low[u] = num[u] = ct++;
    for (auto v : G[u]){
        if (num[v] == 0){
            p[v] = u;
            dfs(v);
            if (low[v] > num[u]){
                if (M[hsh(u,v)] == 1){
                    printf("%d %d\n",u,v);
                }
            }
            low[u] = min(low[u],low[v]);
        }
        else if (v != p[u]){
            low[u] = min(low[u],num[v]);
        }
    }
}
int main(){
    scanf("%d%d",&n,&m);
    k[0] = 1;
    for (int i = 1; i <= n; i++){
        k[i] = (k[i-1]*3)%1000000007;
    }
    for (int i = 0; i < m; i++){
        int u,v;
        scanf("%d%d",&u,&v);
        if (u > v) swap(u,v);
        G[u].push_back(v);
        G[v].push_back(u);
        M[hsh(u,v)] = min(2,M[hsh(u,v)]+1);
    }
    for (int i = 1; i <= n; i++){
        if (num[i] == 0){
            dfs(i);
        }
    }
}

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'int main()':
pipes.cpp:37:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
pipes.cpp:44:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&u,&v);
         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10