Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<cat.size(); ++i) { ^ user.cpp:23:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=r=i; cat[r-l]==cat[r] && r<cat.size(); ++r); ^ user.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; r<cat.size() && cat[r-l]==cat[r]; ++r); ^ user.cpp:41:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=pat.size(); i<cat.size(); ++i) ^ user.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(z[i]>=pat.size()) ^ user.cpp:48:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=pat.size(); ant && i<cat.size(); ++i) ^ user.cpp:49:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(z[i]>=pat.size()) ^ user.cpp:12:9: warning: unused variable ‘n’ [-Wunused-variable] int n, m, k, l, r, ant; ^ user.cpp:12:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, k, l, r, ant; ^