Compilare: main.cpp: In function 'int main()': main.cpp:92:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < query[i].size(); k++){ ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read(int&)': main.cpp:31:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:36:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^