Compilare: user.cpp: In function ‘int main()’: user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 2; i <= n; i++, lin = 1 - lin) { ^ user.cpp:17:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fdin, "%llu%llu%llu", &n, &l, &m); ^ user.cpp:18:61: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fdin, "%llu%llu%llu%llu%llu", &s, &x, &y, &z, &v); ^