View Compilation Error

0_0_32776115_14072.cpp: In function 'long long unsigned int string_hash(int, int)':
0_0_32776115_14072.cpp:57:12: error: 'h' was not declared in this scope
     return h[r] - h[l-1]*base[r-l+1];//熟练掌握字符串哈希的写法，有点类似前缀和的思想；
            ^
0_0_32776115_14072.cpp:57:26: error: 'base' was not declared in this scope
     return h[r] - h[l-1]*base[r-l+1];//熟练掌握字符串哈希的写法，有点类似前缀和的思想；
                          ^