Submission #801915

#	Time	Username	Problem	Language	Result	Execution time	Memory
801915		Trisanu_Das	Wand (COCI19_wand)	C++17	Compilation error	0 ms	0 KiB

wand

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

bool vis[100001];
vector<int> adj[100001];

void dfs(int u){
	vis[u] = true;
	for(int i = 0; i < adj[u].size(); i++){
		if(!vis[adj[u][i]]) dfs(adj[u][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 >> u >> v;
		adj[v].push_back(u);
	}
	for(int i = 0; i < adj[1].size(); i++) dfs(adj[1][i]);
	if(adj[1].size() == 0) vis[1] = 1;
	for(int i = 1; i < n + 1; i++) cout << vis[i];
}

Compilation message (stderr)

wand.cpp: In function 'void dfs(int)':
wand.cpp:9:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for(int i = 0; i < adj[u].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~
wand.cpp: In function 'int main()':
wand.cpp:18:10: error: 'u' was not declared in this scope
   18 |   cin >> u >> v;
      |          ^
wand.cpp:18:15: error: 'v' was not declared in this scope
   18 |   cin >> u >> v;
      |               ^
wand.cpp:21:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for(int i = 0; i < adj[1].size(); i++) dfs(adj[1][i]);
      |                 ~~^~~~~~~~~~~~~~~
wand.cpp:15:12: warning: unused variable 'a' [-Wunused-variable]
   15 |  int n, m, a, b;
      |            ^
wand.cpp:15:15: warning: unused variable 'b' [-Wunused-variable]
   15 |  int n, m, a, b;
      |               ^