oj.uz

Submission #527700

# Submission time Handle Problem Language Result Execution time Memory
527700 2022-02-18T03:57:06 Z beepbeepsheep Pipes (CEOI15_pipes) C++17
20 / 100
 994 ms 15140 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll int
#define ii pair<ll,ll>
#define endl '\n'
const ll inf=1e15;
const ll mod=1e9+7;
const ll maxn=1e5+5;

vector<ll> adj[maxn];
ll cnt[maxn],depth[maxn],low[maxn];
ll par[maxn][2];
int root(ll x, ll l){
    if (par[x][l]==x) return x;
    return par[x][l]=root(par[x][l],l);
}
bool connect(ll a, ll b, ll l){
    if (root(a,l)==root(b,l)) return 0;
    par[root(a,l)][l]=root(b,l);
    return 1;
}
void dfs(ll node, ll p){
    bool seen=0;
    for (auto &u:adj[node]){
        if (u==p && !seen){
            seen=1;
            continue;
        }
        if (depth[u]==-1){
            depth[u]=depth[node]+1;
            dfs(u,node);
            if (low[u]>depth[node]){
                cout<<node<<' '<<u<<endl;
            }
            low[node]=min(low[node],low[u]);
        } else if (u!=p){
            low[node]=min(low[node],depth[u]);
        }
    }
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,e,a,b;
    cin>>n>>e;
    for (int i=0;i<maxn;i++) low[i]=inf;
    memset(depth,-1,sizeof(depth));
    for (int i=0;i<maxn;i++){
        par[i][0]=i;
        par[i][1]=i;
    }
    for (int i=0;i<e;i++){
        cin>>a>>b;
        if (connect(a,b,0) || connect(a,b,1)){
            adj[a].emplace_back(b);
            adj[b].emplace_back(a);
        }
    }
    for (int i=1;i<=n;i++){
        if (depth[i]!=-1) continue;
        depth[i]=1;
        dfs(i,-1);
    }
    return 0;
}

Compilation message

pipes.cpp:7:14: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+15' to '2147483647' [-Woverflow]
    7 | const ll inf=1e15;
      |              ^~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4172 KB Output is correct
2 Incorrect 2 ms 4204 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4812 KB Output is correct
2 Incorrect 5 ms 4556 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 4748 KB Output is correct
2 Incorrect 81 ms 4676 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 142 ms 5396 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 255 ms 6968 KB Output is correct
2 Correct 206 ms 6580 KB Output is correct

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 420 ms 11908 KB Output is correct
2 Incorrect 295 ms 7916 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 545 ms 13152 KB Output is correct
2 Incorrect 455 ms 9816 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 663 ms 15140 KB Output is correct
2 Incorrect 654 ms 9480 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 845 ms 15132 KB Output is correct
2 Incorrect 777 ms 9384 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 994 ms 14652 KB Output is correct
2 Correct 952 ms 11080 KB Output is correct