Compilare: main.cpp: In function 'void Read()': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < s.size();++i) ~~^~~~~~~~~~ main.cpp: In function 'void Solve()': main.cpp:84:11: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] if(x1 != y1) ^~ main.cpp:84:11: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized]