Compilare: user.cpp:131:10: warning: "/*" within comment [-Wcomment] /* ^ user.cpp:146:9: warning: "/*" within comment [-Wcomment] /*for(int i = 1; i <= m; i++) ^ user.cpp: In function ‘void build_prefix(std::string)’: user.cpp:25:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.length(); i++) ^ user.cpp:31:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < a.length(); i++) ^ user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.length(); i++) ^