Compilare: main.cpp: In function 'int main()': main.cpp:28:9: warning: unused variable 'n' [-Wunused-variable] 28 | int n, h, w, mod, st, nrst, cnt; | ^ main.cpp: In function 'bool verif(int, int, int)': main.cpp:42:34: warning: unused variable 'first' [-Wunused-variable] 42 | int dir[4] = {w, -w, 1, -1}, first = 1, last = w * h, i; | ^~~~~