Compilare: user.cpp: In function ‘bool check(line)’: user.cpp:115:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < puncte[nivel].size() ; ++i ){ ^ user.cpp:139:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < A[1].size() ; ++i ){ ^ user.cpp:144:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < A[2].size() ; ++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:185:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1 ; i < aux.size() ; ++i ){ ^ user.cpp:220:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < sol.size() ; ++i ){ ^ user.cpp:237:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1 ; i < sol.size() ; ++i ){ ^ user.cpp:244:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < unique_sol.size() ; ++i ){ ^