Compilare: user.cpp: In function ‘void input()’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < word1.size(); ++i) { ^ user.cpp:32:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < word2.size(); ++i) { ^ user.cpp: In function ‘void solve()’: user.cpp:158:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < new_pos.size() - 1; ++i) { ^