map in c 2b 2b

1#include <iostream>
2#include <string>
3#include <map>
4
5using std::string;
6using std::map;
7
8int main() {
9	// A new map
10  	map<string, int> myMap = { // This equals sign is optional
11		{"one", 1},
12    	{"two", 2},
13    	{"three", 3}
14  	};
15
16  	// Print map contents with a range-based for loop
17    // (works in C++11 or higher)
18  	for (auto& iter: myMap) {
19    	std::cout << iter.first << ": " << iter.second << std::endl;  
20  	}
21}

1//Since c++17
2for (auto& [key, value]: myMap) {
3    cout << key << " has value " << value << endl;
4}
5//Since c++11
6for (auto& kv : myMap) {
7    cout << kv.first << " has value " << kv.second << endl;
8}

1#include<bits/stdc++.h>
2using namespace std;
3
4int main()
5{
6  map<string,int>mapa;
7  for(int i=0;i<10;i++){
8    int x;
9    string s;
10    cin>>x>>s;
11    mapa.insert({s,x});
12    }
13  for(auto [x,y]:mapa){
14    cout<<x<<" "<<y<<'\n';
15  }
16}

1//assuming your variables are called : variables_
2#include <map>
3#include <string>
4
5std::map<int, std::string> map_;
6map_[1] = "mercury";
7map_[2] = "mars";
8map_.insert(std::make_pair(3, "earth"));
9//either synthax works to declare a new entry
10
11return map_[2]; //here, map_[2] will return "mars"

1// map::at
2#include <iostream>
3#include <string>
4#include <map>
5
6int main ()
7{
8  std::map<std::string,int> mymap = {
9                { "alpha", 0 },
10                { "beta", 0 },
11                { "gamma", 0 } };
12
13  mymap.at("alpha") = 10;
14  mymap.at("beta") = 20;
15  mymap.at("gamma") = 30;
16
17  for (auto& x: mymap) {
18    std::cout << x.first << ": " << x.second << '\n';
19  }
20
21  return 0;
22}

1#include <bits/stdc++.h>
2#include <iostream>
3#include <map>
4using namespace std;
5void mapDemo(){
6	map<int, int> A;
7	A[1] = 100;
8	A[2] = -1;
9	A[3] = 200;
10	A[100000232] = 1;
11	//to find the value of a key
12	//A.find(key)
13	
14	//to delete the key
15	//A.erase(key)
16	
17	map<char, int> cnt;
18	string x = "Sumant Tirkey";
19	
20	for(char c:x){
21		cnt[c]++;//map the individual character with it's occurance_Xtimes
22	}
23	
24	//see  how many times a and z occures in my name
25	cout<< cnt['a']<<" "<<cnt['z']<<endl;
26	
27} 
28	
29int main() {
30	mapDemo();
31	return 0;
32}