Submission #97599

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
97599	2019-02-17T12:18:36 Z	dalgerok	Pipes (CEOI15_pipes)	C++14	Compilation error	0 ms	0 KB

pipes

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


const int N = 1e5 + 2;



int n, m;
int p[2][N];
int tin[N], fup[N], timer;
vector < pair < int, int > > g[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].first,
            ind = g[v][i].second;
        if(ind == pr){
            continue;
        }
        if(!used[to]){
            dfs(to, ind);
            if(fup[to] > tin[v]){
                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(make_pair(y, i));
        g[y].push_back(make_pair(x, i));
    }
    for(int i = 1; i <= n; i++){
        if(!used[i]){
            dfs(i);
        }
    }
}

Compilation message

pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:20:5: error: 'used' was not declared in this scope
     used[v] = true;
     ^~~~
pipes.cpp: In function 'int main()':
pipes.cpp:61:13: error: 'used' was not declared in this scope
         if(!used[i]){
             ^~~~