[PTA] 7-19 check face value (15 points)

A buyer went to the bank to exchange a y element f Split check , As a result, the cashier gave it to f element y branch . The buyer used n I didn't find anything wrong until I got a score , So I counted the balance and there was still 2y element 2f branch , Ask what the face value of the check is ？

Input format ：

The input gives less than... On one line 100 The positive integer n.

Output format ：

In one line by format y.f Output the original face value of the check . If there is no solution , The output No Solution.

Examples 1："> sample input 1：

23

sample output 1：

25.51

sample input 2：

22

sample output 2：

No Solution

#include <stdio.h>

int main(void)
{
    int y=0, f=0, n, flag=0;
    scanf("%d", &n);
    
//     f*100 + y - n == 2*y*100 + 2*f
    for (f = 0;  f*100 + y - n != 2*y*100 + 2*f; f++)
    {
        if (f==100)
        {
            f = 0;
            y++;
        }
        
        if (y==100)
        {
            flag = 1;
            break;
        }
        
    }
    
    if (flag == 1)
    {
        printf("No Solution");
    }
    else
    {
        printf("%d.%d", y, f);
    }
    
    return 0;
}