Compilare: main.cpp:9:32: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] array<array<int,maxn-1>,1<<maxn-1> len; ~~~~^~ main.cpp: In function 'int main()': main.cpp:23:14: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] int N = 1<<n-1; ~^~ main.cpp:30:17: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] int Mi = M^M1&-M1; ~~^~~~ main.cpp:13:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.in", "r", stdin); ^ main.cpp:14:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.out", "w", stdout); ^