Compilare: user.cpp: In function ‘int main()’: user.cpp:48:19: warning: unused variable ‘r’ [-Wunused-variable] int i,j,t,x,y,r,ok; ^ user.cpp:48:21: warning: unused variable ‘ok’ [-Wunused-variable] int i,j,t,x,y,r,ok; ^ user.cpp:45:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.in","r",stdin); ^ user.cpp:46:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.out","w",stdout); ^ user.cpp:50:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&K); ^