Compilare: user.cpp: In function ‘int main()’: user.cpp:10:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=s;i++) ^ user.cpp:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=s;j++) ^ user.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=s;j++) ^ user.cpp:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=s;i++) ^ user.cpp:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=s;i++) ^ user.cpp:25:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=s;j++) ^ user.cpp:34:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=s;j++) ^ user.cpp:6:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avere.in","r",stdin); ^ user.cpp:7:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avere.out","w",stdout); ^ user.cpp:8:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu%llu",&s,&n); ^