特殊矩阵的查找

#include<stdio.h>
int main()
{
    int a[5][6] = {  
                    {1, 2, 3, 4, 5, 6},    
                    {7, 8, 9, 10, 11, 12},    
                    {13, 14, 15, 16, 17, 18},    
                    {19, 20, 21, 22, 23, 24},    
                    {25, 26, 27, 28, 29, 30}
                };
    int i,j,sum,num;
    scanf("%d",&num);
    i = 0;
    j = 5;
    sum = 0;
    while(num > a[i][j])
    {
       i++;
       sum++;
        while(num<a[i][j])
        {
            j--;
            sum++;
        }
    }
    printf("%d %d %d\n",i,j,sum);
    return 0;
}