Compilare: main.cpp: In function 'bool permutation(ll*, ll)': main.cpp:78:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (hash.size()*1LL == n) ~~~~~~~~~~~~~~~~^~~~ main.cpp: In function 'void print(const H&, const T& ...)': main.cpp:129:1: warning: this 'if' clause does not guard... [-Wmisleading-indentation] nod[x] = true; ^ main.cpp:129:28: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' nod[x] = true; ^