PTA 1011 World Cup Betting

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博客围绕中国足球彩票“Triple Winning”游戏展开，介绍其规则，即选三场比赛，每场选W、T、L三种结果之一，各结果有赔率，胜者赔率为三赔率乘积乘65%。给出输入输出规格和示例，并用Python实现思路以计算最大利润。

问题描述

With the 2010 FIFA World Cup running, football fans the world over were becoming increasingly excited as the best players from the best teams doing battles for the World Cup trophy in South Africa. Similarly, football betting fans were putting their money where their mouths were, by laying all manner of World Cup bets.

Chinese Football Lottery provided a “Triple Winning” game. The rule of winning was simple: first select any three of the games. Then for each selected game, bet on one of the three possible results – namely W for win, T for tie, and L for lose. There was an odd assigned to each result. The winner’s odd would be the product of the three odds times 65%.

For example, 3 games’ odds are given as the following:

W T L
1.1 2.5 1.7
1.2 3.1 1.6
4.1 1.2 1.1
To obtain the maximum profit, one must buy W for the 3rd game, T for the 2nd game, and T for the 1st game. If each bet takes 2 yuans, then the maximum profit would be (4.1×3.1×2.5×65%−1)×2=39.31 yuans (accurate up to 2 decimal places).

Input Specification:
Each input file contains one test case. Each case contains the betting information of 3 games. Each game occupies a line with three distinct odds corresponding to W, T and L.

Output Specification:
For each test case, print in one line the best bet of each game, and the maximum profit accurate up to 2 decimal places. The characters and the number must be separated by one space.

Sample Input:
1.1 2.5 1.7
1.2 3.1 1.6
4.1 1.2 1.1
Sample Output:
T T W 39.31

思路分析及代码实现

def solve(li):
    res = (max(li[0]) * max(li[1]) * max(li[2]) * 0.65 - 1) * 2
    dic = {0:'W',1:'T',2:'L'}
    maxn = 0
    for i in range(3):
        maxn = max(li[i])
        index = dic[li[i].index(maxn)]
        print(index, end=' ')
    print(round(res, 2))

li = [[1.1,2.5,1.7],[1.2,3.1,1.6],[4.1,1.1,1.2]]
solve(li)