Compilare: user.cpp: In function ‘void findc(int, int, int, int&, int&)’: user.cpp:14:9: warning: unused variable ‘ans’ [-Wunused-variable] int ans = -1, mx = INT_MIN; ^ user.cpp: In function ‘void combine(std::pair<std::vector<int>, std::vector<int> >&, std::pair<std::vector<int>, std::vector<int> >&)’: user.cpp:42:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < aux.first.size(); i ++ ) ^ user.cpp:48:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < aux.second.size(); i ++ ) ^ user.cpp: In function ‘int solve(int, int)’: user.cpp:136:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < aux.first.size(); i ++ ) { ^ user.cpp:158:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < aux.second.size(); i ++ ) { ^ user.cpp: In function ‘void builds(int, int, std::pair<std::vector<int>, std::vector<int> >&)’: user.cpp:111:35: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] if( y == f || mrk[y] == 1 || y == pos ) ^