(Gym) Runtime Error http://codeforces.com/gym/100026 Problem C

I sent a code for problem C in this contest: http://codeforces.com/gym/100026 and I got runtime error (I didn't have runtime error in my computer nor in custom invocation). I couldn't find out where the error came from so I simplified my code (knowing it would get WA) to find the source. One of the last codes I sent was:  ↵
↵
~~~~~↵
#include <bits/stdc++.h>↵
↵
using namespace std;↵
struct punt{↵
int x,y;↵
};↵
typedef vector < punt > VE;↵
int n,k;↵
VE mines, pals;↵
int main(){↵
cin >> n >> k;↵
pals = VE(n);↵
mines = VE(k);↵
for(int i = 0; i < n; i++) {↵
int x,y;↵
cin >> x >> y;↵
pals[i] = {x,y};↵
}↵
for(int i = 0; i < k; i++) {↵
int x,y;↵
cin >> x >> y;↵
mines[i] = {x,y};↵
}↵
cout << "** " << mines[0].x << ' ' << mines[0].y << endl;↵
}↵
~~~~~↵
↵
↵
↵
And I still got runtime error. Checking the test case with a friend who has "coach mode" enabled I could find out k != 0 (as it corresponds to first test case in the sample). The source of the runtime error is the access to mines[0] but I don't understand why. ↵
Moreover, when I change the last few lines to these ones:  ↵
↵
~~~~~↵
for(int i = 0; i < k; i++) {↵
int x,y;↵
cin >> x >> y;↵
mines[i] = {x,y};↵
cout << "** " << mines[i].x << ' ' << mines[i].y << endl;↵
}↵
~~~~~↵
I don't get runtime error. Instead this message is shown     ↵
↵
![alt text](https://github.com/elpassiu/Algorithms/raw/master/foto1.png "Logo Title Text 1")↵
↵
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Can someone help me? Is it a CF problem or mine?