Compilare: user.cpp: In function ‘int Gcd_Matrix(int, int, int)’: user.cpp:36:13: warning: unused variable ‘h’ [-Wunused-variable] int h = 9; ^ user.cpp: In function ‘int query(int, int, int, int)’: user.cpp:103:13: warning: unused variable ‘sum’ [-Wunused-variable] int sum = 0; ^ user.cpp: In function ‘void solve()’: user.cpp:118:52: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i][j + (1 << lg - 1)][lg - 1]); ^ user.cpp:119:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j][lg - 1]); ^ user.cpp:120:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] res = Gcd(res, gcd[i + (1 << lg - 1)][j + (1 << lg - 1)][lg - 1]); ^ user.cpp:120:68: 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:16:41: 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:19:34: 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 ‘int query(int, int, int, int)’: user.cpp:109:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void queries()’: user.cpp:136:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &L); ^