Compilare: main.cpp: In function 'int main()': main.cpp:78:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<sol.size();++k) ~^~~~~~~~~~~ main.cpp:56:10: warning: 'color' may be used uninitialized in this function [-Wmaybe-uninitialized] char color; ^~~~~ main.cpp:102:30: warning: 'cy' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<cx<<' '<<cy<<'\n'<<color; ^~~~~ main.cpp:102:15: warning: 'cx' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<cx<<' '<<cy<<'\n'<<color; ^~~