Compilare: user.cpp: In function ‘int main()’: user.cpp:105:9: warning: unused variable ‘i’ [-Wunused-variable] int i,x,y; ^ user.cpp:105:11: warning: unused variable ‘x’ [-Wunused-variable] int i,x,y; ^ user.cpp:105:13: warning: unused variable ‘y’ [-Wunused-variable] int i,x,y; ^ user.cpp:106:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(In); ^ user.cpp:107:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(Out); ^ user.cpp:108:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^