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  • LC 375. Guess Number Higher or Lower II

    We are playing the Guess Game. The game is as follows:

    I pick a number from 1 to n. You have to guess which number I picked.

    Every time you guess wrong, I'll tell you whether the number I picked is higher or lower.

    However, when you guess a particular number x, and you guess wrong, you pay $x. You win the game when you guess the number I picked.

    Example:

    n = 10, I pick 8.
    
    First round:  You guess 5, I tell you that it's higher. You pay $5.
    Second round: You guess 7, I tell you that it's higher. You pay $7.
    Third round:  You guess 9, I tell you that it's lower. You pay $9.
    
    Game over. 8 is the number I picked.
    
    You end up paying $5 + $7 + $9 = $21.
    

    Given a particular n ≥ 1, find out how much money you need to have to guarantee a win.

    Runtime: 56 ms, faster than 38.71% of C++ online submissions for Guess Number Higher or Lower II.
    Memory Usage: 5.4 MB, less than 0.56% of C++ online submissions for Guess Number Higher or Lower II.
     
    class Solution {
      vector<vector<int>>dp;
    public:
      int getMoneyAmount(int n) {
        dp.resize(n+1, vector<int>(n+1,0));
        return DP(1,n);  
      }
    
    
      int DP(int s, int e) {
        if(s >= e) return 0;
        if(dp[s][e] != 0) return dp[s][e];
        int res = INT32_MAX;
        for(int x=s; x<=e; x++) {
          int tmp = x + max(DP(s,x-1),DP(x+1,e));
          res = min(res, tmp);
        }   
        dp[s][e] = res;
        return res;
      }   
    };
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  • 原文地址:https://www.cnblogs.com/ethanhong/p/10361356.html
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