Compilare: main.cpp: In function 'int main()': main.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cuv.size(); ++i) ~~^~~~~~~~~~~~ main.cpp:70:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; x - i >= 0 && x + 1 + i < cuv.size() && !vis[x - i] && !vis[x + 1 + i] && cuv[x - i] == cuv[x + 1 + i]; ++i) ~~~~~~~~~~^~~~~~~~~~~~ main.cpp:77:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ans < cuv.size()) ~~~~^~~~~~~~~~~~