Compilare: user.cpp: In function ‘int main()’: user.cpp:82:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &K, &N); ^ user.cpp:87:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &v[i].i1, &v[i].j1, &v[i].i2, &v[i].j2); ^ user.cpp: At global scope: user.cpp:11:21: warning: ‘w’ defined but not used [-Wunused-variable] struct {char x, y;} w[DIM][DIM]; ^