Compilare: main.cpp: In function 'int main()': main.cpp:12:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[pos] != 'B' && pos < s.size() - 1) ~~~~^~~~~~~~~~~~~~ main.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = liber + 2; j < s.size() - 2; ++j) { ~~^~~~~~~~~~~~~~ main.cpp:52:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = pos + 2; j < s.size() - 1; ++j) { ~~^~~~~~~~~~~~~~