Compilare: main.cpp: In function 'int main()': main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 1; j < b.size(); j++ ) ~~^~~~~~~~~~ main.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 1; j < b.size(); j++ ) ~~^~~~~~~~~~ main.cpp:94:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < res.size(); i++ ) ~~^~~~~~~~~~~~