九度1022 -栈 - 游船出租

这题目我想到的是栈，当然感觉也是想多了，，

#include<stdio.h>
#include<stack>
#include<math.h>
using namespace std;
double round(double r)
{
    return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
}
stack<int>data[100];
int sum;
int num;
int pre;
void init(){
    for(int i=0;i<100;i++){
        while(!data[i].empty())
            data[i].pop();
    }
    sum=0;num=0;pre=0;
}
int main(){

    int n,a,b;
    char c;
    init();
    while(1){
        scanf("%d",&n);
        if(n==-1)break;
        scanf(" %c %d:%d",&c,&a,&b);
        int t=a*60+b;
        if(n==0){
            if(num==0)
                printf("0 0\n");
            else
                printf("%d %d\n",num,(int)round((double)sum/num));
            init();
        }
        else{
            pre=t;
            if(c=='S')
                data[n].push(t);
            else if(c=='E'){
                if(data[n].empty())
                    continue;
                int time=data[n].top();
                data[n].pop();
                sum+=t-time;num++;
            }
        }
    }
    return 0;
}