Compilare: main.cpp: In function 'bool ok(double)': main.cpp:31:25: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] if(!gd[i][j]==1) ^~ main.cpp:36:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<q.size();i++) ~^~~~~~~~~