Compilare: main.cpp: In function 'void S(V&, const V&)': main.cpp:10:58: warning: this 'for' clause does not guard... [-Wmisleading-indentation] void S(V& A, const V& B) {if (A.empty()) A.push_back(0); for (size_t i = 0, j = std::max(A.size(), B.size()); i < j; i++) ^~~ main.cpp:11:34: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' I(A, i, B.size() <= i? 0: B[i]); if (!A.back()) A.pop_back();} ^~