zoukankan      html  css  js  c++  java
  • LC 712. Minimum ASCII Delete Sum for Two Strings

    Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equal.

    Example 1:

    Input: s1 = "sea", s2 = "eat"
    Output: 231
    Explanation: Deleting "s" from "sea" adds the ASCII value of "s" (115) to the sum.
    Deleting "t" from "eat" adds 116 to the sum.
    At the end, both strings are equal, and 115 + 116 = 231 is the minimum sum possible to achieve this.
    

     

    Example 2:

    Input: s1 = "delete", s2 = "leet"
    Output: 403
    Explanation: Deleting "dee" from "delete" to turn the string into "let",
    adds 100[d]+101[e]+101[e] to the sum.  Deleting "e" from "leet" adds 101[e] to the sum.
    At the end, both strings are equal to "let", and the answer is 100+101+101+101 = 403.
    If instead we turned both strings into "lee" or "eet", we would get answers of 433 or 417, which are higher.
    

     

    Note:

    • 0 < s1.length, s2.length <= 1000.
    • All elements of each string will have an ASCII value in [97, 122].

    两个字符串最长子序列。

    Runtime: 12 ms, faster than 76.47% of C++ online submissions for Minimum ASCII Delete Sum for Two Strings.

    #include <iostream>
    #include <string>
    #include <string.h>
    using namespace std;
    class Solution {
    public:
      int minimumDeleteSum(string s1, string s2) {
        int dp[s1.size()+1][s2.size()+1];
        memset(dp, 0, sizeof(dp));
        int sum = 0;
        for(int i=0; i<s1.size(); i++){
          sum += (int)s1[i];
          for(int j=0; j<s2.size(); j++){
            if(s1[i] == s2[j]) {
              dp[i+1][j+1] = dp[i][j] + (int)s1[i];
            }else {
              dp[i+1][j+1] = max(dp[i+1][j], dp[i][j+1]);
            }
          }
        }
        for(int i=0; i<s2.size(); i++){
          sum += (int)s2[i];
        }
        return sum - 2*dp[s1.size()][s2.size()];
      }
    };
  • 相关阅读:
    CAP分布式
    专职DBA-MySQL数据库开篇
    os.sep
    DocStrings
    Python如何获取脚本的参数
    LVM基础命令
    VoAndEntityTrans
    短信倒计时
    springboot在eclipse上搭建项目一(无页面)
    springboot问题
  • 原文地址:https://www.cnblogs.com/ethanhong/p/10207995.html
Copyright © 2011-2022 走看看