# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1035125 | vjudge1 | Pipes (CEOI15_pipes) | C++17 | 390 ms | 65536 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <vector>
using namespace std;
const int N = 8e4+2;
struct dsu {
int e[N];
int find(int &x) { return e[x] < 0 ? x : e[x] = find(e[x]); }
bool join(int a, int b) {
a = find(a), b = find(b);
if (a == b) return false;
if (e[a] > e[b]) swap(a, b);
e[a] += e[b]; e[b] = a;
return true;
}
} d1, d2;
vector<int> g[N];
int timer=0;
void dfs(int at, int par) {
d1.e[at]=d2.e[at]=++timer;
for(int &to:g[at]) {
if(to == par) {
par+=N;
continue;
}
if(d2.e[to]) {
d1.e[at]=min(d1.e[at], d2.e[to]);
} else {
dfs(to, at);
d1.e[at]=min(d1.e[at], d1.e[to]);
}
}
if(par>N)par-=N;
if(d1.e[at] == d2.e[at] and at!=par) {
printf("%d %d\n", at, par);
}
}
int n, m, u, v;
int main() {
srand(time(0));
scanf("%d %d", &n, &m);
//nt u, v;
for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=-1;
for(int i = 0;i<m;i++) {
scanf("%d %d", &u, &v);
if((d1.join(u, v) || d2.join(u, v))) {
g[u].push_back(v);
g[v].push_back(u);
}
}
for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=0;
for(int i= 1;i<=n;i++) {
if(!d1.e[i]) {
dfs(i, i);
}
}
}
Compilation message (stderr)
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