Compilare: user.cpp: In function ‘int expand(int, int)’: user.cpp:41:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = x, j = y ; j < S.size() ; ++ i, ++ j) { ^ user.cpp: In function ‘void preprocessZ()’: user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i < S.size() ; ++ i) ^ user.cpp:60:28: warning: unused variable ‘lungA’ [-Wunused-variable] int k = i - L, lungA = R - L + 1, lungB = R - i + 1; ^ user.cpp: In function ‘int main()’: user.cpp:75:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = A.size() ; i < S.size() ; ++ i) { ^ user.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Z[i] >= A.size()) ^