Compilare: main.cpp: In function 'int main()': main.cpp:142:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < bucket[id].size(); j++) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:145:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = j + 1; k < bucket[id].size(); k++) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:163:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < events.size() && events[j].m <= l[i].m) { ~~^~~~~~~~~~~~~~~ main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:25:43: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ main.cpp: In member function 'void InputReader::advance()': main.cpp:70:47: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^