Compilare: main.cpp: In function 'bool Matching(int)': main.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a.size(); i++ ) { ~~^~~~~~~~~~ main.cpp: In function 'void RabinKarp()': main.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a.size(); i++ ) { ~~^~~~~~~~~~ main.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a.size(); i++ ) { ~~^~~~~~~~~~ main.cpp:47:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = len - 1; i < b.size(); i++ ) { ~~^~~~~~~~~~