1. map search fault.cpp

#include<iostream>
#include<map>
using namespace std;
int main()
{
    map<char,int>Map;
    for(char c='a';c<='j';c++)
    {
        int value=(int)c;
        Map[c]=value;
    }
    cout<<"Initially map size: "<<Map.size()<<endl; 
    for(char c='a';c<='z';c++)
    {
        if(Map[c]==0){}
    }
    cout<<"After Search map size: "<<Map.size()<<endl;
    return 0;
}

2. output

Initially map size: 10
After Search map size: 26