Compilare: main.cpp: In function 'bool Ok(int)': main.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < sb.size(); i++) { ~~^~~~~~~~~~~ main.cpp:62:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(pointer[let] < buck[let].size() && buck[let][pointer[let]] < pos) ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:65:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pointer[let] + x > buck[let].size()) return false; ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:80:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < sa.size(); i++) { ~~^~~~~~~~~~~