Compilare: user.cpp: In function ‘int main()’: user.cpp:180:15: warning: unused variable ‘s’ [-Wunused-variable] int i,j,h,x,k,s; ^ user.cpp: In function ‘bool comp(int*, int*)’: user.cpp:37:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:178:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("plus2.in","r",stdin); ^ user.cpp:179:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("plus2.out","w",stdout); ^ user.cpp:181:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:185:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d",&k); ^