C :

#include<stdio.h>
#include<math.h>
int main()
{
	int t,n;
	double a;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%lf",&a);
		n=1;
		if(a<=10){printf("1\n");continue;}
		while(a>=10)
		{
			a+=5;
			a/=10;
			a=floor(a);
			n*=10;
		}
		printf("%d\n",(int)(a*n));
	}
	return 0;
}

C++ :

#include <stdio.h>

int main() {
	int t, n, k;
	scanf("%d", &t);
	while (t--) {
		scanf("%d", &n);
		if (n <= 10) {
			puts("1");
			continue;
		}
		k = 1;
		while (1) {
			k *= 10;
			if (k > n)
				break;
			if (n % k >= k / 2)
				n = (n / k + 1) * k;
			else
				n = n / k * k;
		}
		printf("%d\n", n);
	}
	return 0;
}