Main.cpp: In function 'int32_t main()':
Main.cpp:10:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     freopen("duck.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:11:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     freopen("duck.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:28:13: warning: 'three' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |       three += 1;
      |       ~~~~~~^~~~
Main.cpp:23:11: warning: 'two' may be used uninitialized in this function [-Wmaybe-uninitialized]
   23 |       two += 1;
      |       ~~~~^~~~