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function<int(int,int,int,int)> get = [&](int x1,int y1,int x2,int y2) -> int{ return 1; }
auto get = [&](int x1,int y1,int x2,int y2) -> int{ return 1; }
int get(int x1,int y1,int x2,int y2){ return 1; }
function<void(TreeNode*)> dfs = [&](TreeNode* root) {
}
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