PAT 1053 住房空置率 注意坑点

注意输出%的时候，printf("%%");需要两个百分号，这是这道题唯一的坑点。

#include <iostream>
#include<cstdio>
using namespace std;
struct room {
	int day;//观察天数
	double amount[1001];
	int low=0;//低于阙值的天数
};
room a[1001];
int  maybe=0, sure=0;
int main()
{
	int N, D;
	double e;
	cin >> N >> e >> D;
	for (int i = 0; i < N; i++) {
		cin >> a[i].day;
		for (int j = 0; j < a[i].day; j++) {
			cin >> a[i].amount[j];
			if (a[i].amount[j] < e)
				a[i].low++;
		}
		if (a[i].day <= D&&a[i].low > a[i].day / 2)
			maybe++;
		if (a[i].day > D&&a[i].low > a[i].day / 2)
			sure++;
	}
	double d1 = double(maybe) / double(N);
	double d2 = double(sure) / double(N);
	d1 *= 100;
	d2 *= 100;
	printf("%.1lf", d1);
	printf("%% ");
	printf("%.1lf", d2);
	printf("%%");
}

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