Compilare: main.cpp: In function 'int main()': main.cpp:35:17: warning: variable 'xx' set but not used [-Wunused-but-set-variable] int xx, yy; ^~ main.cpp:35:21: warning: variable 'yy' set but not used [-Wunused-but-set-variable] int xx, yy; ^~ main.cpp:18:34: warning: variable 'ok' set but not used [-Wunused-but-set-variable] int n, i, st, dr, mij, nr=0, ok, j; ^~ main.cpp:18:38: warning: unused variable 'j' [-Wunused-variable] int n, i, st, dr, mij, nr=0, ok, j; ^