本文主要是介绍LeetCode-Jewels_and_Stones,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
题目:
You're given strings J
representing the types of stones that are jewels, and S
representing the stones you have. Each character in S
is a type of stone you have. You want to know how many of the stones you have are also jewels.
The letters in J
are guaranteed distinct, and all characters in J
and S
are letters. Letters are case sensitive, so "a"
is considered a different type of stone from "A"
.
Example 1:
Input: J = "aA", S = "aAAbbbb" Output: 3
Example 2:
Input: J = "z", S = "ZZ" Output: 0
Note:
S
andJ
will consist of letters and have length at most 50.- The characters in
J
are distinct.
翻译:
你被给定字符串 J
表示石头类型是珠宝, S
表示你有的石头。每一个 S
中的字符是一种你拥有的石头。你想知道你拥有的多少石头同时也是珠宝。
J
中的字母保证是不同的,并且 J
和 S
中的所有字符都是字母。字母大小写敏感,因此,"a"
被看作是和 "A"
不同的。
例子1:
输入: J = "aA", S = "aAAbbbb" 输出: 3
例子2:
输入: J = "z", S = "ZZ" 输出: 0
注意:
S
和J
包含的字符长度不超过50。J
中的字符是不同的。
思路:
用set存储 J 中不同的字符。然后扫描 S 中的字符看是否在set中,若在,则说明是珠宝,结果result++。
C++代码(Visual Studio2017):
#include "stdafx.h"
#include <iostream>
#include <string>
#include <set>
using namespace std;class Solution {
public:int numJewelsInStones(string J, string S) {int result=0;set<char> setJ(J.begin(), J.end());for (char s : S)if (setJ.count(s))result++;return result;}
};int main()
{Solution s;string J = "aA";string S = "aAAbbbb";int result;result = s.numJewelsInStones(J, S);cout << result;return 0;
}
这篇关于LeetCode-Jewels_and_Stones的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!