Submission #1061555

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061555		jamjanek	Thousands Islands (IOI22_islands)	C++17	5 / 100	18 ms	6336 KiB

islands

#include "islands.h"

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

int odw[100010];
vector<int>graf[100010];
void dfs(int x){
	for(auto j: graf[x]){
		odw[j]++;
		if(odw[j]==1)
			dfs(j);
	}
}
std::variant<bool, std::vector<int>> find_journey(int n, int m, std::vector<int> U, std::vector<int> V) {
	
	if(n==2)return false;
	int a, b, c, d, e, f;
	for(int i=0;i<m;i++){
		if(U[i]==0 && V[i]==1)
			a = i;
		if(V[i]==0 && U[i]==1)
			b = i;
		if(U[i]==0 && V[i]==2)
			c = i;
		if(V[i]==0 && U[i]==2)
			d = i;
		if(U[i]==2 && V[i]==1)
			e = i;
		if(V[i]==2 && U[i]==1)
			f = i;
	}
	vector<int>ans = {a, f, d, c, e, b, d, f, a, b, e, c};
	return ans;
	int i;
	for(i=0;i<m;i+=2){
		graf[U[i]].push_back(V[i]);
	}
	odw[0] = 1;
	dfs(0);
	for(i=0;i<n;i++)
		if(odw[i]>1)
			return true;
	return false;
}

Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:35:54: warning: 'f' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |  vector<int>ans = {a, f, d, c, e, b, d, f, a, b, e, c};
      |                                                      ^
islands.cpp:35:54: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:35:54: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:35:54: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:35:54: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:35:54: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 1: 0 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45