Problem in declaring vector,Runtime error

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1

The link to my code is mwwBjl - Online C++ Compiler & Debugging Tool - Ideone.com

Why am i getting runtime error. the above code is solution of question Smallest Multiple With 0 and 1 | InterviewBit

Thanks in advance.

2

the problem is in your multiple function not in declaration…
if you try to run your main only by commenting your multiple function you will see the output “in main”

3

  1. Your multiple function returns an std::string but you haven’t used the return value. Though this is not the reason of the runtime error, still it will give a warning.

  2. In line number 16 and 18, you are doing flag[val] = 1, where val = 1 according to your code. However, your vectors are still of size 0, so you are accessing memory out of bounds, which gives you RTE.

Have a look at this code of yours. I have removed the RTE, but have not touched your solution: Corrected code

4

on dev c++, I could even see some chk0 printed.chk0 which are before the assignment flag[val]=1 get printed and after that code stops working.

5

Got it. Thanks a lot.

6

#include <bits/stdc++.h>

using namespace std;

int main () {
int t;
cin >>t;
while(t–) {
long long int n,k;
cin >>n>>k;
vector< int> v(k+1);
for(long long int i =0;i<n;i++) {
long long int x;
cin >>x;
v[k - x%k]++;
}
pair <long long int ,long long int> p = {0,0};
for (long long int i=1;i<k;i++) {
if(p.first < v[i]) {
p.first = v[i];
p.second = i;
}
else if (p.first ==v[i]) {
p.second =i;
}
}
if(p.first ==0) cout <<“0” <<endl;
else cout << p.first * k -(k-p.second) + 1<<endl;
}
}

why this code is giving runtime error in testcase 5.