Compilare: user.cpp: In function ‘int main()’: user.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= x; ++i) ^ user.cpp:28:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = x + 1; j <= x2; ++j) ^ user.cpp:35:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = x + 1; j <= x2; ++j) ^ user.cpp:23:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%u", &n, &k, &x); ^