Compilare: user.cpp: In function ‘int query(int, int, int, int)’: user.cpp:101:13: warning: unused variable ‘sum’ [-Wunused-variable] int sum = 0; ^ user.cpp: In function ‘void solve()’: user.cpp:116:52: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i][j + (1 << lg - 1)][lg - 1]); ^ user.cpp:117:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j][lg - 1]); ^ user.cpp:118:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j + (1 << lg - 1)][lg - 1]); ^ user.cpp:118:68: 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:17:41: 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:20:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp: In function ‘int query(int, int, int, int)’: user.cpp:107:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void queries()’: user.cpp:134:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &L); ^