原题：

Description

　　Let Compression of an integer  a be the sum of all digits of  a and yields another positive integer. It is obvious that if we compress a number for certain finite steps, we will reach a one digit number. You are given a positive integer a and you are asked to output a one digit number which is created by compression of a.
For instance, if you are given a number 86, after one step of compression, we will reach number 8+6=14 , and after another step of compression, we reach 1+4=5. So, you should write  5 to the output.

Input

The number of test cases comes in the first line.  For each test case you are given a positive integer a<=2^31-1

Output

For each test case, write one digit number that you will reach after some steps of compression.

Sample Input

34311157871

Sample Output

731

 

分析：

简单数学题~~

源码：

#include<stdio.h> int main() { 	long long k,m,n; 	scanf("%lld",&k); 	while(k--) 	{ 		scanf("%lld",&m); 		while(m/10!=0) 		{ 			n=m%10; 			m/=10; 			m+=n; 		} 		printf("%lld\n",m); 	} 	return 0; }