三道水题

做了三道水题，练手。水题也要细心

POJ 1004：

/*Accepted 180K 0MS C++ 187B 2012-04-26 16:48:20 */
#include<cstdio>

double a, sum;

int main()
{
    sum = 0;
    for( int i = 0; i < 12; i ++)
    {
        scanf( "%lf", &a);
        sum += a;
    }
    printf( "$%.2lf\n", sum / 12);
    return 0;
}

POJ 2027

/*Accepted 164K 0MS C++ 223B 2012-04-26 16:54:03 */
#include<cstdio>

int main()
{
    int x, y;
    int t;
    scanf( "%d", &t);
    while( t --)
    {
        scanf( "%d%d", &x, &y);
         if( x < y)
            printf( "NO BRAINS\n");
        else
            printf( "MMM BRAINS\n");
    }
    return 0;
}

POJ 2017

/*Accepted 164K 0MS C++ 321B 2012-04-26 17:07:30 */
#include<cstdio>

int main()
{
    int n, a, b, c, d, sum;
    while( scanf( "%d", &n) != EOF)
    {
        if( n == -1) break;
        scanf( "%d%d", &a, &b);
        sum = a * b;
        for( int i = 1; i < n; i ++)
        {
            scanf( "%d%d", &c, &d);
            sum += c * ( d - b);
            b = d;
        }
        printf( "%d miles\n", sum);
    }
    return 0;
}