1476B - Inflation - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;
int main(){
    int t;
    scanf("%d", &t);
    while(t--){
        long long n, k, sum;
        scanf("%lld %lld %lld", &n, &k, &sum);
        long long ans = 0;
        for(int i = 1; i < n; i++){
            long long x;
            scanf("%lld", &x);
            if(sum * k < x * 100){
                long long o = (x * 100 + k - 1) / k - sum;
                ans += o;
                sum += o;
            }
            sum += x;
        }
        printf("%lld\n", ans);
    }
    return 0;
}