제출 #100526

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
100526		Feeder	Wand (COCI19_wand)	C++11	컴파일 에러	0 ms	0 KiB

wand

#include<bits/stdc++.h>
using namespace std;
bool vis[100001];
vector<int> adj[100001];
void dfs(int x){
	vis[x] = 1;
	for(int i=0; i<adj[x].size(); i++){
		if(vis[adj[x][i]]) continue;
		dfs(adj[x][i]);
	}
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n, m, a, b;
	cin >> n >> m;
	for(int i=0; i<m; i++){
		cin >> a >> b;
		adj[b].push_back(a);
	}
	for(int i=0; i<adj[1].size(); i++) dfs(adj[1][i]);
	if(adj[1][i].size() == 0) vis[1] = 1;
	for(int i=1; i<=n; i++) cout << vis[i];
}

컴파일 시 표준 에러 (stderr) 메시지

wand.cpp: In function 'void dfs(int)':
wand.cpp:7:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<adj[x].size(); i++){
               ~^~~~~~~~~~~~~~
wand.cpp: In function 'int main()':
wand.cpp:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<adj[1].size(); i++) dfs(adj[1][i]);
               ~^~~~~~~~~~~~~~
wand.cpp:22:12: error: 'i' was not declared in this scope
  if(adj[1][i].size() == 0) vis[1] = 1;
            ^