Compilare: main.cpp: In function 'int main()': main.cpp:15:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i = 1; i <= n; i++) ^~~ main.cpp:30:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout << a[44000+x]; ^~~~ main.cpp:21:36: warning: iteration 12000 invokes undefined behavior [-Waggressive-loop-optimizations] a[k] = b[k-i*j] + b[k] + b[k+i*j]; ~~~~~~~^ main.cpp:19:38: note: within this loop for(int k = 88000; k >= 0; k--) ~~^~~~ In file included from /usr/include/string.h:635:0, from /usr/include/c++/6/cstring:42, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:48, from main.cpp:1: In function 'void* memcpy(void*, const void*, size_t)', inlined from 'int main()' at main.cpp:18:40: /usr/include/x86_64-linux-gnu/bits/string3.h:53:71: warning: call to void* __builtin___memcpy_chk(void*, const void*, long unsigned int, long unsigned int) will always overflow destination buffer return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest)); ^