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View Compilation Error

0_0_38906421_31079.cpp: In function 'void updata(int, int, int, int, int)':
0_0_38906421_31079.cpp:28:20: error: 'max' was not declared in this scope; did you mean 'maxn'?
   28 |         tree[rt] = max(tree[rt << 1], tree[rt << 1 | 1]);
      |                    ^~~
      |                    maxn


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