/in/foo.cc: In function 'int main()':
/in/foo.cc:16:27: error: 'memset' was not declared in this scope
   memset(dp, 0, sizeof(dp));
                           ^
/in/foo.cc:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 1; j < x.length(); j++)
                    ~~^~~~~~~~~~~~