Submission #638296

#	Time	Username	Problem	Language	Result	Execution time	Memory
638296		jamezzz	Thousands Islands (IOI22_islands)	C++17	5 / 100	26 ms	3028 KiB

islands

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

variant<bool,vector<int>> find_journey(int N,int M,vector<int> U,vector<int> V){
	if(N<3)return false;
	int a,b,c,d;
	for(int i=0;i<M;++i){
		if(U[i]==0&&V[i]==1)a=i;
		if(U[i]==1&&V[i]==0)b=i;
		if(U[i]==0&&V[i]==2)c=i;
		if(U[i]==2&&V[i]==0)d=i;
	}
	return vector<int>{a,b,c,d,b,a,d,c};
}

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:14:36: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |  return vector<int>{a,b,c,d,b,a,d,c};
      |                                    ^
islands.cpp:14:36: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:14:36: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:14:36: warning: 'a' 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