Compilare: main.cpp: In function 'void f(int)': main.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz == c.size() - 1) ~~~~^~~~~~~~~~~~~~~ main.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < c.size(); j ++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s.size(); j ++) ~~^~~~~~~~~~