Compilare: main.cpp: In function 'int main()': main.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1 ; i <= sir2.size()-1 ; i++ ) ~~^~~~~~~~~~~~~~~~ main.cpp:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i <= sir1.size()-1 ; i++ ) ~~^~~~~~~~~~~~~~~~ main.cpp:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i <= sir2.size()-1 ; i++ ) ~~^~~~~~~~~~~~~~~~