coffeescript data fetch.. please upvote the answer if it helps you. thanks.

https://stackoverflow.com/a/74575681/5115565

Test Cases 2 & 3 give wrong answer not sure what's going on t = int(input().strip()) for a0 in range(t): n = int(input().strip()) s = 0 n = n-1 m = n//3 x = n//5 y = n // 15 s += 3*m*(m+1)/2 s += 5*x*(x+1)/2 s -= 15*y*(y+1)/2 print(int(s))

print(int(s))

Help me, my code does not the test 2 and test 3 due to a time error.

int main(){
    int t;
    cin >> t;
    for(int a0 = 0; a0 < t; a0++){
        int n;
        int addition = 0;
        cin >> n;
        for (int i = 0; i<n; i++) {
          if (i % 3 == 0 || i % 5 == 0) {
            addition += i;
          }
        }
        cout << addition << "\n";
    }
    return 0;
}

Can someone help? 2 of my test cases don't pass due to a time error.

include

int main () { int t; int sum = 0; scanf ("%d", &t); for (int j = 0; j < t; j++) { int n; scanf ("%d", &n); for (int i = 0; i < n; i++) { if (i % 3 == 0 || i % 5 == 0) sum = sum + i; } printf("%d",sum); sum=0; }

return 0; }

Using AP Time Complexity: O(1)

long long sumAP(long long n, long long d)
{
    n /= d;
    return (n) * (1 + n) * d / 2;
}

long long sumMultiples(long long n)
{
    n--; 
    return sumAP(n, 3) + sumAP(n, 5) - sumAP(n, 15);
}