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check if map key has alue cpp

By Graceful GoatGraceful Goat on Aug 28, 2020 
#include<map>

int main(){

  	map<int,char> m;
  	
  	char ch = '!';
  
	if (m.find(ch) != m.end()) {
		std::cout << "Key found";
	} else {
		std::cout << "Key not found";
	}
  
	return 0;
}

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check if an element exists in a map c++

By Concerned ChinchillaConcerned Chinchilla on Jan 01, 2021 
#include <iostream>
#include <unordered_map>
#include <algorithm>
 
int main()
{
    std::unordered_map<char,int> m;
 
    std::string s("abcba");
    std::for_each(s.begin(), s.end(), [&m](char &c) { m[c]++; });
 
    char ch = 's';
 
    if (m.find(ch) != m.end()) {
        std::cout << "Key found";
    } else {
        std::cout << "Key not found";
    }
 
    return 0;
}

Source: www.techiedelight.com

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