Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:47:8: warning: unused variable ‘mx’ [-Wunused-variable] int mx = -1, x = 0, y = 0, lin, col, ok = 0; ^ user.cpp:47:17: warning: unused variable ‘x’ [-Wunused-variable] int mx = -1, x = 0, y = 0, lin, col, ok = 0; ^ user.cpp:47:24: warning: unused variable ‘y’ [-Wunused-variable] int mx = -1, x = 0, y = 0, lin, col, ok = 0; ^ user.cpp: In function ‘void write()’: user.cpp:81:5: warning: ‘mx’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i = 1; i <= mx; ++i){ ^ user.cpp:83:25: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] x = dad[lin][col] / n + 1; ^ user.cpp:83:25: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized]