Compilare: main.cpp: In function 'int f(int)': main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1,j=n ; i<=n ; ++i) ~^~~ main.cpp:19:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j>=1 && a[i]+a[j]>x) ~~~~~~~~~^~ main.cpp: In function 'unsigned int func(unsigned int)': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(f(i+pas)<x) ~~~~~~~~^~ main.cpp: In function 'int main()': main.cpp:51:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.in","r",stdin); ^ main.cpp:53:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.out","w",stdout); ^ main.cpp:55:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u%u",&n,&k); ^ main.cpp:59:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u",&a[i]); ^