Compilare: main.cpp: In function 'int main()': main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= input.size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:26:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < input.size()) ~~^~~~~~~~~~~~~~ main.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == input.size() || (i != 0 && get<0>(input[i - 1]) != salt)) ~~^~~~~~~~~~~~~~~ main.cpp:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == input.size()) ~~^~~~~~~~~~~~~~~