Compilare: user.cpp: In function ‘int RMQ(int, int)’: user.cpp:84:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void findDiameter(int&, int&)’: user.cpp:122:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); i++) ^ user.cpp:148:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); i++) ^ user.cpp:171:15: warning: ‘start2’ may be used uninitialized in this function [-Wmaybe-uninitialized] y = start2; ^