Compilare: main.cpp: In function 'int main()': main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s1.size(); i++) ~~^~~~~~~~~~~ main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < s2.size(); i++) ~~^~~~~~~~~~~ main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == s1.size()) ~~^~~~~~~~~~~~ main.cpp:16:9: warning: unused variable 'poz' [-Wunused-variable] int poz = 0; ^~~