nyoj 盗梦空间

#include <stdio.h>
#include <string.h>
int main()
{
    int t,i,n,x,y,time,s,l,m;
    char a[15];
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d",&m);
        y=0;
        time=0;
        getchar();
        while(m--)
        {
            gets(a);
            l=strlen(a);
            if(a[0]=='I')
            y++;
            else if(a[0]=='O')
            y--;
            else if(a[0]=='S')
            {
                for(i=0,x=1;i<y;i++)
                x*=20;
                n=0;
                for(i=l-1,s=1;i>=5;i--)
                {
                    n+=(a[i]-'0')*s;
                    s*=10;
                }
                time+=n*60/x;
            }
        }
        printf("%d\n",time);
    }
    return 0;
}