http://acm.hdu.edu.cn/showproblem.php?pid=4803
贪心的策略是,每次尽量加价格,加到能满足条件的最大值,然后加一下数量,这样反复直到到达答案。
然后加到满足条件最大值一步不能模拟,可以推一下公式就能直接算出来了
代码:
#include <stdio.h> #include <string.h> const double eps = 1e-9; double x, y; int main() { while (~scanf("%lf%lf", &x, &y)) { if (x > y) { printf("-1\n"); continue; } double s = (y + 1 - eps) / x; double tmp = 1; int count = (int)x - 1; for (int i = 1; i <= (int)x; i++) { int sb = (int)(s * i - tmp); tmp += sb; tmp = tmp / i * (i + 1); count += sb; } printf("%d\n", count); } return 0; }
HDU 4803 Poor Warehouse Keeper(贪心),布布扣,bubuko.com
HDU 4803 Poor Warehouse Keeper(贪心)
原文地址:http://blog.csdn.net/accelerator_/article/details/25918999