Submission #373483

#	Time	Username	Problem	Language	Result	Execution time	Memory
373483		eulerdesoja	Traffic (IOI10_traffic)	C++14	Compilation error	0 ms	0 KiB

traffic

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

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

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

void setIO(string s) {
  ios_base::sync_with_stdio(0); cin.tie(0); 
  freopen((s+".in").c_str(),"r",stdin);
  freopen((s+".out").c_str(),"w",stdout);
}
const int mxn=1e6+6;
vi g[mxn];
int n,a[mxn],ma[mxn],sum[mxn];//maximum of congestion in a road

void dfs(int i,int p){
	for(int j:g[i])if(j!=p){
		dfs(j,i);
		sum[i]+=sum[j];
		ma[i]=max(ma[i],max(ma[j],sum[j]));
	}
	sum[i]+=a[i];
}
int32_t main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	//setIO("sort");
	cin>>n;
	for(int i=0;i<n;i++)cin>>a[i];
	for(int i=0;i<n-1;i++){
		int x,y;cin>>x>>y;
		g[x].pb(y);
		g[y].pb(x);
	}
	int ans=1e18,res;
	for(int i=0;i<n;i++){
		memset(sum,0,sizeof(sum));
		memset(ma,0,sizeof(ma));
		dfs(i,-1);
		if(ma[i]<ans){
			ans=ma[i];
			res=i;
		}
	}
	cout<<res<<"\n";
	return 0;
}
/*
5
10 10 10 20 20
0 2
1 2
2 3
3 4
*/

Compilation message (stderr)

traffic.cpp: In function 'void setIO(std::string)':
traffic.cpp:14:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
traffic.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/cc4GO54H.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccCYUKNw.o:traffic.cpp:(.text.startup+0x0): first defined here
/tmp/cc4GO54H.o: In function `main':
grader.cpp:(.text.startup+0xd9): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status