ZOJ - 3607 Lazier Salesgirl(模拟)
2017-08-21 19:16
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Lazier Salesgirl
Time Limit: 2 Seconds Memory Limit: 65536 KB
Kochiya Sanae is a lazy girl who makes and sells bread. She is an expert at bread making and selling. She can sell the i-th customer a piece of bread for price pi.
But she is so lazy that she will fall asleep if no customer comes to buy bread for more than w minutes. When she is sleeping, the customer coming to buy bread will leave immediately. It's known that she starts to sell bread now and the i-th
customer come after ti minutes. What is the minimum possible value of w that maximizes the average value of the bread sold?
The first line of each test case contains an integer 1 ≤ n ≤ 1000 indicating the number of customers. The second line contains n integers 1 ≤ pi ≤
10000. The third line contains nintegers 1 ≤ ti ≤ 100000. The customers are given in the non-decreasing order of ti.
Time Limit: 2 Seconds Memory Limit: 65536 KB
Kochiya Sanae is a lazy girl who makes and sells bread. She is an expert at bread making and selling. She can sell the i-th customer a piece of bread for price pi.
But she is so lazy that she will fall asleep if no customer comes to buy bread for more than w minutes. When she is sleeping, the customer coming to buy bread will leave immediately. It's known that she starts to sell bread now and the i-th
customer come after ti minutes. What is the minimum possible value of w that maximizes the average value of the bread sold?
Input
There are multiple test cases. The first line of input is an integer T ≈ 200 indicating the number of test cases.The first line of each test case contains an integer 1 ≤ n ≤ 1000 indicating the number of customers. The second line contains n integers 1 ≤ pi ≤
10000. The third line contains nintegers 1 ≤ ti ≤ 100000. The customers are given in the non-decreasing order of ti.
Output
For each test cases, output w and the corresponding average value of sold bread, with six decimal digits.Sample Input
2 4 1 2 3 4 1 3 6 10 4 4 3 2 1 1 3 6 10
Sample Output
4.000000 2.500000 1.000000 4.000000
题意:有一家面包店,接下来的第 t[i] 分钟会有一位客人来以 p[i] 的价格买走一块面包,但面包店只要超过 w 分钟没有顾客光临,老板就会睡着,
之后来的客人就买不了面包了,问在保证卖出的面包的平均价格尽量高的情况下 w 的最小值是多少
思路:由于数据范围不大,我们只需要暴力枚举每一个合法的老板有可能睡着的时间点 t[i] 即可。何谓合法的时间点?即到这一时刻之前
t[j] - t[j-1]的最大值必定要小于 t[i+1] - t[i]。(保证在这个时间点之前没睡着,且在下一位客人到来之前睡着)
#include <bits/stdc++.h> using namespace std; const int N = 1e4 + 10; int t, n; double p , v , vv ; struct xx{ double p, v; int n; }a ; bool cmp(xx a, xx b){ if(a.p == b.p) return a.v < b.v; return a.p > b.p; } int main(){ scanf("%d", &t); while(t--){ scanf("%d", &n); double sum = 0, maxi = 0; int ii = 0; for(int i = 1; i <= n; i++){ scanf("%lf", &p[i]); p[i] += p[i-1]; } for(int i = 1; i <= n; i++){ scanf("%lf", &v[i]); double tmp = v[i]-v[i-1]; vv[i] = max(vv[i-1], tmp); } v[n+1] = 0x3f3f3f3f; int x = 0; for(int i = 1; i <= n; i++){ if(vv[i] < v[i+1]- v[i]){ 4000 a[x].v = vv[i]; a[x].p = p[i]/i*1.0; x++; } } sort(a, a+x, cmp); printf("%.6f %.6f\n", a[0].v, a[0].p); } }
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