Compilare: user.cpp: In function ‘int main()’: user.cpp:68:50: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘int’ [-Wformat=] printf("%llu %llu\n", v[0].first, v[0].second); ^ user.cpp:46:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN_FILE, "r", stdin); ^ user.cpp:47:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT_FILE, "w", stdout); ^ user.cpp:49:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int X, Y; scanf("%d%d", &X, &Y); ^