NutelIa's blog

By NutelIa, history, 7 years ago, In English

I sent a code for problem C in this contest: http://codeforces.net/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

Can someone help me? Is it a CF problem or mine?

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7 years ago, # |
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Auto comment: topic has been updated by NutelIa (previous revision, new revision, compare).

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7 years ago, # |
  Vote: I like it +4 Vote: I do not like it

it's not standard input!

freopen("mines.in", "r", stdin) ;
freopen("mines.out", "w", stdout) ;
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    7 years ago, # ^ |
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    Thank you! (I shouldn't be programming that late in the night hahaha)