Compilare: user.cpp: In function ‘int main()’: user.cpp:94:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ansr.size(); ++i){ ^ user.cpp:104:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ansr.size(); ++i) ^ user.cpp:107:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ansb.size(); ++i) ^ user.cpp:42:15: warning: ‘sx’ may be used uninitialized in this function [-Wmaybe-uninitialized] visl[sx] = 1; ^ user.cpp:47:16: warning: ‘sy’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(visc[col]){ ^