Compilare: user.cpp: In function ‘void BuildPrefixMatch()’: user.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= s.size(); i++) ^ user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= E.size(); i++) { ^ user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= s.size(); j++) { ^ user.cpp: In function ‘void BuildSuffixMatch()’: user.cpp:40:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= s.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:73:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= E.size(); i++) { ^ user.cpp:75:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j <= s.size(); j++) { ^