Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:13:29: warning: unused variable 'j' [-Wunused-variable] int new_x , new_y , i , j ; ^ main.cpp: In function 'int main()': main.cpp:71:25: warning: 'j_' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs ( i_ , j_ , 1) ; ^ main.cpp:71:25: warning: 'i_' may be used uninitialized in this function [-Wmaybe-uninitialized]