Compilare: user.cpp: In function ‘int main()’: user.cpp:57:17: warning: NULL used in arithmetic [-Wpointer-arith] if (G[i] == NULL || impar[i]) { ^~~~ user.cpp:46:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:49:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^