제출 #878962

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
878962		sabukatsire	Traffic (IOI10_traffic)	C++17	0 / 100	8 ms	31068 KiB

traffic

#include<bits/stdc++.h>
using namespace std;
#include "traffic.h"
vector<int> v[1000001];
int sz[1000001],ans = 200000000000,idx;
void dfs(int curr,int pp,int sum){
	int mx = 0;
	for(int j=0;j<v[curr].size();j++){
		if(v[curr][j] == pp) continue;
		dfs(v[curr][j],curr,sum);
		sz[curr] += sz[v[curr][j]];
		mx = max(sz[v[curr][j]],mx);
	} mx = max(mx,sum-sz[curr]);
	if(ans > mx){
		ans = mx;
		idx = curr;
	}
}
int LocateCentre(int n,int p[1000001],int s[1000001],int d[1000001]){
	int sum = 0;
	for(int i=0;i<n;i++) v[i].clear();
	for(int i=0;i<n;i++){
		v[s[i]].push_back(d[i]);
		v[d[i]].push_back(s[i]);
		sz[i] = p[i]; sum += p[i];
	}
	dfs(0,0,sum);
	return idx;
}

컴파일 시 표준 에러 (stderr) 메시지

traffic.cpp:5:23: warning: overflow in conversion from 'long int' to 'int' changes value from '200000000000' to '-1863462912' [-Woverflow]
    5 | int sz[1000001],ans = 200000000000,idx;
      |                       ^~~~~~~~~~~~
traffic.cpp: In function 'void dfs(int, int, int)':
traffic.cpp:8:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |  for(int j=0;j<v[curr].size();j++){
      |              ~^~~~~~~~~~~~~~~

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