Compilare: user.cpp: In function ‘ll get(int)’: user.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (st < v[i].size()){ ^ user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (dr + 1 < v[i].size() && v[i][dr + 1] - v[i][st] <= l) dr++; ^ user.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dr == v[i].size() - 1) ans += (dr - st)*(dr - st + 1)/2, st = dr; ^ user.cpp: In function ‘void read(int&)’: user.cpp:16:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++p == dim) fread(buff, 1, dim, stdin), p = 0; ^ user.cpp:19:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++p == dim) fread(buff, 1, dim, stdin), p = 0; ^ user.cpp: In function ‘int main()’: user.cpp:41:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.in","r",stdin); ^ user.cpp:42:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.out","w",stdout); ^