Submission #97597

#	Time	Username	Problem	Language	Result	Execution time	Memory
97597		dalgerok	Pipes (CEOI15_pipes)	C++14	60 / 100	1389 ms	20432 KiB

pipes

#include<bits/stdc++.h>
using namespace std;


const int N = 1e5 + 1, M = 6e6 + 1;



int n, m;
int p[2][N];
int tin[N], fup[N], timer;
bitset < N > used;
bitset < M > usd;
vector < int > g[N], e[N];

int dsu_get(int x, int v){
    return p[x][v] == v ? v : p[x][v] = dsu_get(x, p[x][v]);
}

void dfs(int v, int pr = 0){
    tin[v] = fup[v] = ++timer;
    used[v] = true;
    for(int i = 0; i < (int)g[v].size(); i++){
        int to = g[v][i], ind = e[v][i];
        if(ind == pr){
            continue;
        }
        if(!used[to]){
            dfs(to, ind);
            if(fup[to] > tin[v]){
                if(!usd[ind]){
                    usd[ind] = true;
                    cout << v << " " << to << "\n";
                }
            }
            fup[v] = min(fup[v], fup[to]);
        }
        else{
            fup[v] = min(fup[v], tin[to]);
        }
    }
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++){
        p[0][i] = p[1][i] = i;
    }
    for(int i = 1; i <= m; i++){
        int x, y;
        cin >> x >> y;
        if(dsu_get(0, x) == dsu_get(0, y)){
            if(dsu_get(1, x) == dsu_get(1, y)){
                continue;
            }
            p[1][dsu_get(1, x)] = dsu_get(1, y);
        }
        else{
            p[0][dsu_get(0, x)] = dsu_get(0, y);
        }
        g[x].push_back(y);
        e[x].push_back(i);
        g[y].push_back(x);
        e[y].push_back(i);
    }
    for(int i = 1; i <= n; i++){
        if(!used[i]){
            dfs(i);
        }
    }
}

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