제출 #33692

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
33692		mohammad_kilani	장난감 기차 (IOI17_train)	C++14	11 / 100	2000 ms	2952 KiB

train

#include <bits/stdc++.h>
#include "train.h"
using namespace std;
const int N = 5010;
bool win[N];
int vis[N];
int vi = 0;
vector<int> g[N];
vector<int> r;
bool DFS(int node,int source){
	if(vis[node] == vi) return false;
	if(r[node]) return false;
	vis[node] = vi;
	if(node == source) return true;
	for(int i=0;i<g[node].size();i++){
		if(DFS(g[node][i],source)) return true;
	}
	return false;
}

bool DFS2(int node){
	if(win[node]) return true;
	if(vis[node] == vi) return false;
	vis[node] = vi;
	for(int i=0;i<g[node].size();i++){
		if(DFS2(g[node][i])) return true;
	}
	return false;
}

std::vector<int> who_wins(std::vector<int> a, std::vector<int> R, std::vector<int> u, std::vector<int> v) {
	vector<int> ans;
	r = R;
	int n = a.size();
	for(int i=0;i<u.size();i++) g[u[i]].push_back(v[i]);
	for(int i=0;i<n;i++){
		for(int j=0;j<g[i].size();j++){
			vi++;
			if(DFS(g[i][j],i)) win[i] = 1;
		}
	}
	for(int i=0;i<n;i++){
		vi++;
		if(DFS2(i)) win[i] = 1;
		ans.push_back(win[i] ^ 1);
	}
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

train.cpp: In function 'bool DFS(int, int)':
train.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[node].size();i++){
               ^
train.cpp: In function 'bool DFS2(int)':
train.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[node].size();i++){
               ^
train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<u.size();i++) g[u[i]].push_back(v[i]);
               ^
train.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<g[i].size();j++){
                ^

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