Compilare: main.cpp: In function 'void kmp(std::__cxx11::string, std::__cxx11::string&)': main.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<=s.size();i++){ ~^~~~~~~~~~ main.cpp:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=s.size();i++){ ~^~~~~~~~~~ main.cpp:22:6: warning: unused variable 'mx' [-Wunused-variable] int mx = 0, mx2 = 0; ^~ main.cpp:22:14: warning: unused variable 'mx2' [-Wunused-variable] int mx = 0, mx2 = 0; ^~~ main.cpp: In function 'int main()': main.cpp:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<s.size();i++){ ~^~~~~~~~~ main.cpp:60:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != s.size()){ ~~^~~~~~~~~~~ main.cpp:46:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strdup.in","r",stdin); ^ main.cpp:47:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strdup.out","w",stdout); ^