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Solved it. Indexing problem. Thank you

I have roamed the internet for many test cases for this problem and I passed all of them but I got a WA. Why is this?
As follows in my code.
#include <bits/stdc++.h>
using namespace std;

int main(){
int months;
int ans;
while (cin >> months){
if (months < 0){
int a,b,c;
cin >> a >> b >> c ...