How to memoization using map?

Question

Here is my code. It's not work...Anyone can help me?

map<int,int> fibo;

int fibonacci( int n )
{
    if ( n == 0 || n == 1 )
        return 1;
    map<int,int>::iterator itr = fibo.find( n );
    if ( itr != fibo.end() )
        return itr->second;
    else
        return fibo[ n ] = fibonacci( n -1 ) + fibonacci( n - 2 );
}

i've solved this. Here's the Sample Solution!

Answer 1

You are checking for end() against the wrong container. Presumably, results is another instance of a map<int,int> .

Change results to fibo :

    if ( itr != fibo.end() )