Compilare: main.cpp: In function 'bool Ok(int)': main.cpp:70:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < sb.size(); i++) { ~~^~~~~~~~~~~ main.cpp:74:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(firstpos + x - 1 >= buck[let].size()) ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:89:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < sa.size(); i++) ~~^~~~~~~~~~~