Compilare: user.cpp:27:24: warning: integer overflow in expression [-Woverflow] const int oo = (1<<31)-1; ^ user.cpp: In function ‘void BuildGraph()’: user.cpp:64:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Heights.size() ; ++ i) { ^ user.cpp:65:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1 ; j < Heights.size() ; ++ j) { ^ user.cpp: In function ‘void MaximumMatching()’: user.cpp:94:28: warning: pointer to a function used in arithmetic [-Wpointer-arith] if(PairUp[i]) { ^