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Submission #873195

# Submission time Handle Problem Language Result Execution time Memory
873195 2023-11-14T15:40:43 Z Ghulam_Junaid Pipes (CEOI15_pipes) C++17
50 / 100
 839 ms 45284 KB 
#include <bits/stdc++.h>
using namespace std;
 
const int N = 1e5 + 1;
int h[N], mnh[N], edges;
bool vis[N];
vector<pair<int, int>> g[N];
 
int root1(int& v){
    return (h[v] == -1 ? v : h[v] = root1(h[v]));
}
 
int root2(int& v){
    return (mnh[v] == -1 ? v : mnh[v] = root2(mnh[v]));
}
 
void merge1(int& u, int& v){    
    int r1 = root1(v);
    int r2 = root1(u);
 
    h[r1] = r2;
 
    edges++;
    g[v].push_back({u, edges});
    g[u].push_back({v, edges});
}
 
void merge2(int& u, int& v){
    int r1 = root2(u);
    int r2 = root2(v);
 
    if (r1 == r2)
        return;
 
    mnh[r1] = r2;
 
    edges++;
    g[v].push_back({u, edges});
    g[u].push_back({v, edges});
}
 
void dfs(int& v, pair<int, int> prev = {-1, -1}){
    vis[v] = 1;
    if (prev.first == -1)
        h[v] = 0;
    mnh[v] = h[v];
 
    for (auto& [u, id] : g[v]){
         if (prev.first == u and prev.second == id)
            continue;
 
        mnh[v] = min(mnh[v], h[u]);
 
        if (vis[u])
            continue;
 
        h[u] = h[v] + 1;
        dfs(u, {v, id});
        mnh[v] = min(mnh[v], mnh[u]);
 
        if (mnh[u] >= h[u])
            printf("%d %d\n", u, v);
            
    }
}
 
int main(){
    int n, m;
    scanf("%d%d", &n, &m);
 
    for (int i=1; i<=n; i++)
        h[i] = mnh[i] = -1;
 
    for (int i=0; i<m; i++){
        int u, v;
        scanf("%d%d", &u, &v);
 
        if (root1(u) != root1(v))
            merge1(u, v);
        else if (root2(u) != root2(v))
            merge2(u, v);
    }
 
    for (int i=1; i<=n; i++)
        h[i] = mnh[i] = n + 100;
 
    for (int v = 1; v <= n; v++)
        if (!vis[v])
            dfs(v);
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:69:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
pipes.cpp:76:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 3160 KB Output is correct
2 Correct 4 ms 2908 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 3156 KB Output is correct
2 Correct 78 ms 2904 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 3668 KB Output is correct
2 Correct 158 ms 3420 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 205 ms 5460 KB Output is correct
2 Correct 171 ms 4944 KB Output is correct

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 282 ms 10832 KB Output is correct
2 Runtime error 254 ms 17908 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 420 ms 12112 KB Output is correct
2 Runtime error 448 ms 26560 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 591 ms 14408 KB Output is correct
2 Runtime error 537 ms 31904 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 694 ms 14416 KB Output is correct
2 Runtime error 679 ms 37656 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 821 ms 13800 KB Output is correct
2 Runtime error 839 ms 45284 KB Memory limit exceeded
3 Halted 0 ms 0 KB -