제출 #345023

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
345023		DavidZ122	Traffic (IOI10_traffic)	C++14	0 / 100	17 ms	24812 KiB

traffic

#include <bits/stdc++.h>
#include "traffic.h"

using namespace std;
typedef vector<int> vi; 
typedef vector<pair<int,int>> vpi;
typedef long long ll; 
#define FIO ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define F1R(i,a) FOR(i,1,a)
#define ROF(i,a,b) for ( i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
#define rsz resize
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define f first
#define s second
#define mp make_pair
#define pb push_back
void setIO(string name = "") { 
    ios_base::sync_with_stdio(0); cin.tie(0); 
   
    if (sz(name)) {
        freopen((name+".in").c_str(), "r", stdin); 
        freopen((name+".out").c_str(), "w", stdout);
    }
}
bool cmp(const pair<pair<int,int>,int>&a, const pair<pair<int,int>,int> &b)
{
	return a.s>b.s;
}
bool cmp2(const pair<pair<int,int>,int>&a, const pair<pair<int,int>,int> &b)
{
	return a.f.s>b.f.s;
}
const int SZ=1e6+1;
const int MOD=1e9+7;
vi adj[SZ];
bool vis[SZ];
ll total=0;
void dfs(int node, int parent, int P[])
{
	total+=P[node];
	trav(x, adj[node])
	{
		if(x!=parent)
		dfs(x, node , P);
	}
}
ll solve(int node, int P[])
{
	ll m=0;
	trav(x, adj[node])
	{
		total=0;
		dfs(x, node, P);
		m=fmax(m, total);
	//	cout<<total<<' '<<x<<' '<<node<<endl;
	}
	return m;
}
int LocateCentre(int N,int P[],int S[], int D[]) {
    FIO;
   	for(int i=0; i<N-1; i++)
   	{
   		adj[S[i]].pb(D[i]);
		adj[D[i]].pb(S[i]);	
	}
	ll ans=0, ansMin=INT_MAX;
	F0R(i, N)
	{
		memset(vis, 0, SZ);
		ll a=solve(i, P);
		if(a<ansMin)
		{
			ans=i;
			ansMin=a;
		}
	}
	return ans+1;
}
//int main() {
//   int P[5] = {10,10,10,20,20};
//   int S[4] = {1, 2, 2, 3};
//   int D[4] = {2, 0, 3, 4};
//   //cout << LocateCentre(5, P, S, D);
// }

컴파일 시 표준 에러 (stderr) 메시지

traffic.cpp: In function 'void setIO(std::string)':
traffic.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   26 |         freopen((name+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
traffic.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   27 |         freopen((name+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25