Compilare: user.cpp: In function ‘int main()’: user.cpp:67:19: warning: unused variable ‘ok’ [-Wunused-variable] int x, y, ok = 1, t = 0, lg; ^ user.cpp:67:34: warning: unused variable ‘lg’ [-Wunused-variable] int x, y, ok = 1, t = 0, lg; ^ user.cpp:74:65: warning: variable ‘len’ set but not used [-Wunused-but-set-variable] ll add = s[t][y] - s[t][y - 1] - s[t][x] + s[t][x - 1], len = n; ^ user.cpp:50:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lld", &n, &m, &S); ^ user.cpp:54:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^ user.cpp:60:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^ user.cpp:63:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &q); ^ user.cpp:69:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n%c %d %d", &ty, &x, &y); ^