foo.cpp: In function 'void dp(int, int, int, int)':
foo.cpp:63:31: error: 'memset' was not declared in this scope
  memset( d, 0x7f, sizeof( d ) );
                               ^
foo.cpp:58:12: warning: unused variable 'k' [-Wunused-variable]
  int i, j, k, p;
            ^