maps stl

#include <bits/stdc++.h> #include <iostream> #include <map> using namespace std; void mapDemo(){ map<int, int> A; A[1] = 100; A[2] = -1; A[3] = 200; A[100000232] = 1; //to find the value of a key //A.find(key) //to delete the key //A.erase(key) map<char, int> cnt; string x = "Sumant Tirkey"; for(char c:x){ cnt[c]++;//map the individual character with it's occurance_Xtimes } //see how many times a and z occures in my name cout<< cnt['a']<<" "<<cnt['z']<<endl; } int main() { mapDemo(); return 0; }

maps stl

#include<iostream>
#include<map>
#include<algorithm>

using namespace std;

int main()
{
    map<int,int>map1{{1,2},{2,3},{3,5},{4,7},{5,11}};
    cout<<map1.at(3)<<endl;
    cout<<map1[3]<<endl;
    map1[6];
    for(map<int,int>::iterator it=map1.begin();it!=map1.end();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }
    cout<<endl;
    cout<<"----------------------"<<endl;
    map1.insert(pair<int,int>(7,17));
    map1.insert(make_pair(8,23));

    for(map<int,int>::iterator it=map1.begin();it!=map1.end();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }
    cout<<endl;
    map<int,int>::iterator its=map1.find(2);
    map1.erase(its);
    for(map<int,int>::iterator it=map1.begin();it!=map1.end();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }
    cout<<endl;
    auto itss=map1.begin();
    auto itss2=map1.end();
    map1.erase(itss,itss2);
    for(map<int,int>::iterator it=map1.begin();it!=map1.end();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }
    cout<<endl;

    return 0;
}

Posted by: Guest on June-04-2021

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