LeetCode|387题|字符串中的第一个唯一字符

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LeetCode|387题|字符串中的第一个唯一字符

详细注释可执行代码

//
// Created by q on 2021/1/16.
//
#include <unordered_map>
#include <string>
#include <iostream>

using namespace std;

class Solution {
 public:
  int firstUniqChar(std::string s) {
    std::unordered_map<int, int> frequency;
    for (char ch: s) {
      ++frequency[ch];//先赋值再自增
    }
    for (int i = 0; i < s.size(); ++i) {
      if (frequency[s[i]] == 1) {//获取每个字符串的频率值
        return i;
      }
    }
    return -1;
  }
};

std::string s = "xiaoqiuslambiji";
int main(){
  Solution solution;
  cout << solution.firstUniqChar(s) << endl;
  return 0;
}

CMakeLists.txt编译文件

cmake_minimum_required(VERSION 2.8)
project(week9)
set(CMAKE_CXX_STANDARD 11)
add_executable(firstUniqChar firstUniqChar.cpp)

标签：std,int,firstUniqChar,frequency,387,字符串,include,LeetCode
来源： https://blog.csdn.net/qq_21950671/article/details/112696319