c++ - C++找不到成员

Question

错误信息:
“std::__ cxx11::basic_string ”没有成员“isSubsequence”。

#include<iostream>
#include<string>
#include<unordered_map>
#include<vector>
using namespace std;

class Solution {
public:
    bool isSubsequence(string s, string t) {
        if(s.size()<t.size()) return false;
        unordered_map<char,int> window,need;
        for(char c:s) need[c]++;
        int left=0,right=0;
        int sum=0;
        while(right<t.size()){
            char c = t[right];
            right++;
            if(need.count(c)){
                window[c]++;
                if(window[c]==need[c]){
                    sum++;
                }
            }
            if(sum==need.size()){
                return true;
            }
        }
        return false;
    }
};

int main(){
    
    string s = "abc";
    string t = "ahbgdc";
    Solution s;
    s.isSubsequence(s,t);    
    return 0;
}

为什么对象不能调用类成员函数？

Answer 1

这里存在命名冲突:

string s = "abc";
//     ^
string t = "ahbgdc";
Solution s;
s.isSubsequence(s,t);
^               ^

可能您想做:

string str = "abc";
string t = "ahbgdc";
Solution s;
s.isSubsequence(str, t);