Compilare: main.cpp: In function 'int main()': main.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1, k = 0;i < s.size();++i) ~~^~~~~~~~~~ main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = p + 1;i < s.size();++i) ~~^~~~~~~~~~