Eroare de compilare: user.cpp:13:1: error: ‘unordered_map’ does not name a type unordered_map< int, int > sol; ^ user.cpp: In function ‘long long int solve(int)’: user.cpp:16:10: error: ‘sol’ was not declared in this scope if ( sol.find( x ) != sol.end() ) { ^ user.cpp:30:5: error: ‘sol’ was not declared in this scope sol[ x ] = ans; ^ user.cpp: In function ‘int main()’: user.cpp:37:9: error: ‘sol’ was not declared in this scope sol[ i ] = -1; ^ user.cpp:39:5: error: ‘sol’ was not declared in this scope sol[ 1 ] = 1; ^