Compilare: main.cpp:4:0: warning: "OVERFLOW" redefined #define OVERFLOW (((long long)1 << 63) - 1) In file included from /usr/include/c++/6/cmath:45:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:41, from main.cpp:1: /usr/include/math.h:393:0: note: this is the location of the previous definition # define OVERFLOW 3 main.cpp: In function 'int main()': main.cpp:4:40: warning: integer overflow in expression [-Woverflow] #define OVERFLOW (((long long)1 << 63) - 1) ~~~~~~~~~~~~~~~~~~~~~^~~ main.cpp:58:18: note: in expansion of macro 'OVERFLOW' if (mysqrt(OVERFLOW, o) >= sq + 1) { ^~~~~~~~ main.cpp:45:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%lld", &n, &m); ^ main.cpp:47:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", &x); ^