Compilare: main.cpp: In function 'int main()': main.cpp:92:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < t.size(); i++) { ~~^~~~~~~~~~ main.cpp:96:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i - length[i] - 1 >= 0 && i + length[i] + 1 < t.size() && t[i - length[i] - 1] == t[i + length[i] + 1]) { ~~~~~~~~~~~~~~~~~~^~~~~~~~~~