Compilare: main.cpp: In function 'int main()': main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp:29:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i != s.size()-1) ~~^~~~~~~~~~~~~ main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; i++) ~~^~~~~~~~~~ main.cpp:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i + k < v.size() && i - k >= 0 && v[i + k] == v[i - k]) ~~~~~~^~~~~~~~~~ main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ~~^~~~~~~~~~