Submission

Score: 70

User: Ratthathammanoon

Problemset: เลขหลักของผลคูณ

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-12 21:42:03

#include <stdio.h>
int main(){
	int X;
	long long int A,B,C,u=1;
	
	
	scanf("%lld",&A);
	
	scanf("%lld",&B);
	
	scanf("%d",&X);
	
	C=A*B;
	
	long long temp = A * B;
	int digits = 0;
	while (temp > 0) {
    	temp /= 10;
    	digits++;
	}

	if (X > digits) {
    	printf("-");
    	return 0;
	}
	
	for(int i = 0; i < digits - X; i++){
        u *= 10;
	}
    C /= u;     
    C %= 10;    

	printf("%lld",C);
	
	return 0;
}