Compilare: user.cpp: In function ‘int main()’: user.cpp:44:31: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(mat[i][j]!=mat[i+dx[k]][j+dy[k]] and mat[i][j]!=mat[i+dx[r]][j+dy[r]]) ^ user.cpp:14:19: warning: variable ‘sch’ set but not used [-Wunused-but-set-variable] char bord='2',sch; ^ /tmp/ccFgXDTh.o: In function `main': user.cpp:(.text.startup+0x83): warning: the `gets' function is dangerous and should not be used.