Compilare: user.cpp: In function ‘int main()’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( register int i = 0; i < N; ++i ) { ^ user.cpp:25:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( register int j = 1; j <= k; ++j ) { ^ user.cpp:18:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( f, "%u%u", &N, &k ); ^