Compilare: user.cpp:27:24: warning: integer overflow in expression [-Woverflow] const int oo = (1<<31)-1; ^ user.cpp: In function ‘void ReadData()’: user.cpp:61:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Heights.size() ; ++ i, cout << '\n') ^ user.cpp:62:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < Heights[i].size() ; ++ j) ^ user.cpp: In function ‘void BuildGraph()’: user.cpp:67:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Heights.size() ; ++ i) { ^ user.cpp:68:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < Heights.size() ; ++ j) { ^ user.cpp: In function ‘void MaximumMatching()’: user.cpp:102:32: warning: pointer to a function used in arithmetic [-Wpointer-arith] if(PairUp[i]) { ^