杭电 1570 A C

Problem Description

Are you excited when you see the title "AC" ? If the answer is YES , AC it ;

You must learn these two combination formulas in the school . If you have forgotten it , see the picture.




Now I will give you n and m , and your task is to calculate the answer .

 

Input

In the first line , there is a integer T indicates the number of test cases.
Then T cases follows in the T lines.
Each case contains a character 'A' or 'C', two integers represent n and m. (1<=n,m<=10)

 

Output

For each case , if the character is 'A' , calculate A(m,n),and if the character is 'C' , calculate C(m,n).
And print the answer in a single line.

 

Sample Input

2 A 10 10 C 4 2

 

Sample Output

3628800 6

 

Author

linle

 

Source

HDU 2007-1 Programming Contest

 

    题目简述：给定两个值n、m，求这俩数的组合值和排列值！n，m的范围都很不大，所以这题不难！

#include <stdio.h>

int AA( int n, int m )
{
    int mul = 1, i;
    for( i = 0; i <= (m-1); i++ )
        mul *= (n - i);
    return mul;
}

int main()
{
    int tcase, n, m;
    char c;
    scanf( "%d", &tcase );
    getchar();
    while( tcase-- )
    {
            scanf( "%c %d %d", &c, &n, &m  );
            getchar();
            if( c == 'A' )
                printf( "%d\n", AA(n,m) );
            else if( c == 'C' )
                printf( "%d\n",AA(n,m)/AA(m,m) );
    }
    return 0;
}