Compilare: main.cpp: In function 'std::__cxx11::string ins(std::__cxx11::string, int, char)': main.cpp:7:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:12:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == s.size()) ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:22:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j <= ans.size()) { ~~^~~~~~~~~~~~~