oj.uz

Submission #317022

# Submission time Handle Problem Language Result Execution time Memory
317022 2020-10-29T01:07:01 Z nandonathaniel Traffic (IOI10_traffic) C++14
0 / 100
 15 ms 23808 KB 
#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN=1e6+5;
vector<int> adj[MAXN];
int subtree[MAXN],atas[MAXN];

void dfs(int now,int par){
	atas[now]=par;
	for(auto nxt : adj[now]){
		if(nxt==par)continue;
		dfs(nxt,now);
		subtree[now]+=subtree[nxt];
	}
}

int LocateCentre(int N, int P[], int S[], int D[])
{
	for(int i=0;i<N;i++)subtree[i]=P[i];
    for(int i=0;i<N-1;i++){
    	adj[S[i]].push_back(D[i]);
    	adj[D[i]].push_back(S[i]);
	}
	dfs(0,-1);
	int ans=1e9,idx;
	for(int i=0;i<N;i++){
		int ret=0;
		for(auto j : adj[i]){
			if(j==atas[i])ret=max(ret,N-subtree[i]);
			else ret=max(ret,subtree[j]);
		}
		if(ret<ans){
			ans=ret;
			idx=i;
		}
	}
	return idx;
}

Compilation message

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:37:9: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   37 |  return idx;
      |         ^~~

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Incorrect 15 ms 23808 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Incorrect 15 ms 23808 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Incorrect 15 ms 23808 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Incorrect 15 ms 23808 KB Output isn't correct
3 Halted 0 ms 0 KB -