Compilare: main.cpp: In function 'int main()': main.cpp:18:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (L[i].size() < k) Q.push_back(i), E[i] = true;} ~~~~~~~~~~~~^~~ main.cpp:23:61: warning: this 'if' clause does not guard... [-Wmisleading-indentation] out << '\n'; bool r = true; for (int i = 0; i < n; i++) if (!E[i]) ^~ main.cpp:24:35: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' r = false, out << i+1 << ' '; if (r) out << "NU"; ^~