这道题目是一道非常简单的贪心,但是我却修改了1h+.原因就是qsort的comp有bug.其实还是题目中的数据可以为0.除数为0真的要慎重啊.后来改为结构体,加一层循环选取最大值,果然ac啊.wa了几次,测试数据都过,还是wa.无语.这道题目一定要注意数据类型,double型. #include <stdio.h> #include <stdlib.h> #define MAXNUM 10050 typedef struct { int js, fs; double rate; }…

DP. #include <stdio.h> #include <string.h> #include <stdlib.h> #define MAXNUM 1005 typedef struct { int w, s; int index; } mouse_st; mouse_st mouses[MAXNUM]; int dp[MAXNUM], next[MAXNUM]; int comp(const void *a, const void *b) { mouse_st…

这道题目是典型的DFS+记忆化搜索, DP思想.符合:含重叠子问题,无后效性等特点. #include <cstdio> #include <cstring> #include <cstdlib> #define MAXN 105 int dp[MAXN][MAXN]; int a[MAXN][MAXN]; int n, k; int max(int a, int b) { return a>b ? a:b; } int dfs(int x, int y) { i…

传送门: http://acm.hdu.edu.cn/showproblem.php?pid=1009 FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 93676    Accepted Submission(s): 32566 Problem Description FatMouse prepared M…

传送门: http://acm.hdu.edu.cn/showproblem.php?pid=1009 FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 92493    Accepted Submission(s): 32082 Problem Description FatMouse prepared M…

解题思路:一只老鼠共有m的猫粮,给出n个房间,每一间房间可以用f[i]的猫粮换取w[i]的豆,问老鼠最多能够获得豆的数量 sum 即每一间房间的豆的单价为v[i]=f[i]/w[i],要想买到最多的豆,一定是先买最便宜的,再买第二便宜的,再买第三便宜的 -----m的值为0的时候求得的sum即为最大值   所以先将v[i]从小到大排序.   FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/…

FatMouse' Trade 点我挑战题目 题意分析 每组数据,给出有的猫粮m与房间数n,接着有n行,分别是这个房间存放的食物和所需要的猫粮.求这组数据能保证的最大的食物是多少? (可以不完全保证这个房间的食物,及食物和猫粮可以同时乘a%) 经典的贪心策略. 先保证性价比最高的房间(花较少的猫粮可以保证最多的粮食),每组数据计算一个比率rate = 房间存放的粮食/所需要的猫粮,按照rate对其进行降序排列,优先满足上方的房间即可. 代码纵览 /* Title:HDOJ.1009 Author…

FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 43381    Accepted Submission(s): 14499 Problem Description FatMouse prepared M pounds of cat food, ready to trade with the cats gu…

FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 36632    Accepted Submission(s): 12064 Problem Description FatMouse prepared M pounds of cat food, ready to trade with the cats gu…

FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 42953    Accepted Submission(s): 14336 Problem Description FatMouse prepared M pounds of cat food, ready to trade with the cats g…