Compilare: main.cpp: In function 'void ireis(std::__cxx11::string&, std::array<std::pair<int, int>, 100005ul>&, int)': main.cpp:40:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < s.size(); j++) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < s.size(); i += 2) { ~~^~~~~~~~~~ main.cpp:86:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) { ~~^~~~~~~~~~ main.cpp:91:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size() - 1; i++) { ~~^~~~~~~~~~~~~~