Compilare: main.cpp: In function 'int main()': main.cpp:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < sir.size() ; i++ ) ~~^~~~~~~~~~~~ main.cpp:60:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < v.size() ; i++ ) ~~^~~~~~~~~~ main.cpp:62:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = i+1 ; j < v.size() ; j++ ) ~~^~~~~~~~~~