Problem:
Score : 100 points

Problem Statement

Compute A \times B.

Constraints

1 \leq A \leq 100

1 \leq B \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the value A \times B as an integer.

Sample Input 1

2 5

Sample Output 1

10

We have 2 \times 5 = 10.

Sample Input 2

100 100

Sample Output 2

10000

Solution in C (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>

int main() {
    long long A[100000],answer = 1,max = 1000000000000000000;
    int n,i;
    scanf("%d",&n);
    
    for (i = 0;i < n;i++){
        scanf("%lld",&A[i]);
    }
    
    for (i = 0;i < n;i++){
        if (A[i] == 0){
            printf("0");
            return 0;
        }
    }
        
    for (i = 0;i < n;i++){
        if(max / A[i] < answer){
            printf("-1");
            return 0;
        }
    }
        
    for (i = 0;i < n;i++){
        answer *= A[i];
        }
    
    printf("%lld\n",answer);
    
    return 0;
}