Compilare: user.cpp: In function ‘int main()’: user.cpp:15:13: warning: unused variable ‘x’ [-Wunused-variable] int n,k,x; ^ user.cpp: In function ‘void inout(bool)’: user.cpp:8:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triplet.in","r",stdin); ^ user.cpp:9:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triplet.out","w",stdout); ^ user.cpp: In function ‘int main()’: user.cpp:16:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:19:17: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] int x=0-k; ^