Compilare: main.cpp: In function 'int ans(std::__cxx11::string, std::__cxx11::string)': main.cpp:20:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (a.sz+b.sz-2*cmlsc[a.sz-1][b.sz-1])<=k; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:25:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lant.in","r",stdin); ^ main.cpp:26:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lant.out","w",stdout); ^