Tietoverkko

input/code.cpp: In function 'void removesingle()':
input/code.cpp:39:2: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(c==0) return;
  ^
input/code.cpp: In function 'int main()':
input/code.cpp:48:2: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(int i; i<(n*2); i++) {
  ^

#include <bits/stdc++.h>

using namespace std;

int n;
int p;
vector<int> v;
vector<int> w;

int findv(int x) {
	for(int i=0; i<n*2; i++) {
		if(v[i]==x) {
			return i;		
		}	
	}
	return -1;
}

void removesingle() {
	int c;
	for(int i = 0; i<n; i++) {
		if(w[i] == 1) { 
			p++;
			c++;
			int pos = findv(i+1);
			w[i]--;
			if(pos%2==0) {
				w[i+1]--;
				v.erase(v.begin()+pos);
				v.erase(v.begin()+pos+1);
			}
			else {
				w[i-1]--;
				v.erase(v.begin()+pos);
				v.erase(v.begin()+pos-1);
			}
		}
	}
	if(c==0) return;
	removesingle();
}

int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	
	cin >> n;
	for(int i; i<(n*2); i++) {
		int t; 
		cin >> t;
		v.push_back(t);
		w[t]++;
	}
	
	removesingle();
	
	cout << p << endl;
}

Test 1

Group: 1

Verdict: RUNTIME ERROR

Test 2

Group: 1

Verdict: RUNTIME ERROR

Test 3

Group: 1

Verdict: RUNTIME ERROR

Test 4

Group: 1

Verdict: RUNTIME ERROR

Test 5

Group: 1

Verdict: RUNTIME ERROR

Test 6

Group: 2

Verdict: RUNTIME ERROR

Test 7

Group: 2

Verdict: RUNTIME ERROR

Test 8

Group: 2

Verdict: RUNTIME ERROR

Test 9

Group: 2

Verdict: RUNTIME ERROR

Test 10

Group: 2

Verdict: RUNTIME ERROR