제출 #373494

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
373494		eulerdesoja	Traffic (IOI10_traffic)	C++14	0 / 100	23 ms	31596 KiB

traffic

#include<bits/stdc++.h>
#include<fstream>
using namespace std;

#define ll long long
#define pb push_back
#define sz(x) int(x.size())

typedef pair<int,int>ii;
typedef vector<int> vi;

const int mxn=1e6+6;
//maximum of congestion in a road
vi g[mxn];	
int ma[mxn],sum[mxn];
bool cmp(ii a,ii b){
	if(a.first==b.first)return a.second<b.second;
	return a.first>b.first;
}
void dfs(int i,int p,int a[]){
	for(int j:g[i])if(j!=p){
		dfs(j,i,a);
		sum[i]+=sum[j];
	}
	sum[i]+=a[i];
}
int LocateCentre(int n,int a[],int s[],int d[]){
	
	for(int i=0;i<n-1;i++){
		g[s[i]].pb(d[i]);
		g[d[i]].pb(s[i]);
	}
	int ans=2e9+10,res=0;
	for(int i=0;i<n;i++){
		memset(sum,0,sizeof(sum));
		memset(ma,0,sizeof(ma));
		dfs(i,-1,a);
		for(int i=0;i<n;i++){
			for(int j:g[i])ma[i]=max(ma[i],sum[j]);
			ma[i]=max(ma[i],sum[0]-sum[i]);
		}
		int ans=2e9+10,res=0;
		if(ma[i]<ans){
			ans=ma[i];
			res=i;
		}
	}
	return res;
}

컴파일 시 표준 에러 (stderr) 메시지

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:42:18: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   42 |   int ans=2e9+10,res=0;
      |                  ^~~
traffic.cpp:33:6: warning: unused variable 'ans' [-Wunused-variable]
   33 |  int ans=2e9+10,res=0;
      |      ^~~

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