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:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:31:33: warning: array subscript has type 'char' [-Wchar-subscripts] astrkey ^= letKey[ a[i] ]; ^ main.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:35:29: warning: array subscript has type 'char' [-Wchar-subscripts] key ^= letKey[ b[i] ]; ^ main.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = len - 1; i < b.size(); i++ ) { ~~^~~~~~~~~~ main.cpp:41:37: warning: array subscript has type 'char' [-Wchar-subscripts] key ^= letKey[ b[i-len] ]; ^ main.cpp:42:33: warning: array subscript has type 'char' [-Wchar-subscripts] key ^= letKey[ b[i] ]; ^