Compilare: main.cpp: In function 'bool kmp(std::__cxx11::string&, std::__cxx11::string&, int*)': main.cpp:45:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p[j]==s2.length()){ ~~~~^~~~~~~~~~~~~ main.cpp:52:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((p[j]!=s2.length()) && (s2[p[j] ]==s1[i-1]) ){ ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void build(std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++){ ~^~~~~~~~~ main.cpp:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v.size(); j++){ ~^~~~~~~~~ main.cpp: In function 'void build_ans()': main.cpp:157:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<ind.size(); i++){ ~^~~~~~~~~~~ main.cpp:159:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j= (((int)v[ind[i] ].length())-1-g[ind[i-1] ][ind[i] ]+1); j<v[ind[i] ].length(); j++ ){ ~^~~~~~~~~~~~~~~~~~~~