map of maps c++

Hilarious Hyena answered on August 19, 2020 Popularity 10/10 Helpfulness 1/10

answer map of maps c++

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map of maps c++

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map <typename,map<typename,typename>> mp;
map[key1][key2]=values

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Tags: c++ map maps

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Contributed on Aug 19 2020

Hilarious Hyena

0 Answers Avg Quality 2/10

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c++ map

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#include <map>

// ===== CONSTRUCTOR

// map (char -> int)
std::map<char,int> map_int;
map_int['a']=10;
map_int['b']=30;

// map (int -> string)
std::map<int, std::string> map_string;
map_string[24] = "46";

// ===== EXISTENCE and SIZE

// map size
map_int.size() : size_type (int)

// search for 'a'
// map.find(key) : map.iterator
if(map_int.find('a') != map_int.end()) {/*...*/}
// map_iterator->first : type(key)
// map_iterator->second : type(value)

// check if the map is empty
map_int.empty() // : bool

// ===== SET

// just name and set 
// if the element already exists, the statement will override that value
map_int['a']=10;

// check before set
if(map_int.find('a') == map_int.end()) 
	map_int['a']=10;

// ===== DELETE

// first: iterator, then: erase(it)
auto it = map_int.find('a');
if(it != map_int.end())
	map_int.erase(it);

// or also, using keys
map_int.erase('a');

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Tags: c++

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Contributed on Jul 31 2022

programmatoroSeduto

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c++ map

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#include <iostream>
#include <string>
#include <map>

using std::string;
using std::map;
map <int,string>MapName;//you can put type you want
map<int,string>::iterator iter;

int main(){
 	int i=31136;
  	string s="name;
//How you insert values
	MapName.insert(pair<int,string>(i,s));
//How you print keys and values 
  	for(iter=studentId.begin();iter!=studentId.end();iter++){
    	cout<<"Key"<<iter->first<<"Value: "<<iter->second<<endl;
    	}
//How you search data
  	if (m.find(31136) != m.end()) {
		cout << "found" << endl;
		}
	else {
		cout << "not found" << endl;
		}
	}

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Tags: c++

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Contributed on May 29 2022

Dull Dolphin

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map in c++

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map in c++

std::map<key_type, value_type> map_name = {{key1, value1},{key2, value2}, ...};

if {1,1,1,2,2,3,3,3,3,4} then after operation for key1 = 4 value will be 1

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Tags: c++

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Contributed on Jul 03 2023

Scary Shark

0 Answers Avg Quality 2/10

map of maps c++

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