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Submission #527337

# Submission time Handle Problem Language Result Execution time Memory
527337 2022-02-17T08:31:41 Z jamielim Pipes (CEOI15_pipes) C++14
10 / 100
 2032 ms 65540 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb emplace_back
#define ALL(x) x.begin(),x.end()
#define SZ(x) (int)x.size()
typedef long long ll;
typedef pair<int,int> ii;
typedef pair<ii,ii> i4;
const int MOD=1000000007;
const int INF=1012345678;
const ll LLINF=1012345678012345678LL;
const double PI=3.1415926536;
const double EPS=1e-14;

const int MAXN=100001;
int n,m;
vector<int> adj[MAXN];
vector<ii> ans;

int par[MAXN];
int dep[MAXN];
int low[MAXN];
int ctr=1;

void dfs(int x){
	dep[x]=low[x]=ctr++;
	for(int i:adj[x]){
		if(dep[i]==0){ // not yet visited
			par[i]=x;
			dfs(i);
			if(low[i]>dep[x])ans.pb(i,x);
			low[x]=min(low[x],low[i]);
		}else if(i!=par[x])low[x]=min(low[x],dep[i]);
	}
}

int main(){
	scanf("%d%d",&n,&m);
	int a,b;
	for(int i=0;i<m;i++){
		scanf("%d%d",&a,&b);
		adj[a].pb(b);adj[b].pb(a);
	}
	for(int i=1;i<=n;i++)if(dep[i]==0)dfs(i);
	for(ii i:ans)printf("%d %d\n",i.fi,i.se);
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:42:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
pipes.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |   scanf("%d%d",&a,&b);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2636 KB Output is correct
2 Incorrect 1 ms 2636 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3320 KB Output is correct
2 Incorrect 5 ms 3020 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 147 ms 11480 KB Output is correct
2 Correct 149 ms 10692 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 255 ms 15452 KB Output is correct
2 Runtime error 308 ms 19236 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 468 ms 26792 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 764 ms 33108 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1111 ms 55368 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1534 ms 65540 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1976 ms 65540 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2032 ms 65540 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -