Compilare: user.cpp: In function ‘void solve()’: user.cpp:36:52: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i][j + (1 << lg - 1)][lg - 1]); ^ user.cpp:37:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j][lg - 1]); ^ user.cpp:38:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j + (1 << lg - 1)][lg - 1]); ^ user.cpp:38:68: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j + (1 << lg - 1)][lg - 1]); ^ user.cpp: In function ‘void read()’: user.cpp:12:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &k, &q); ^ user.cpp:15:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M[i][j]); ^ user.cpp: In function ‘void queries()’: user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &L); ^