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update(oj-notes): new array tip
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sabertazimi authored Aug 14, 2017
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Expand Up @@ -697,6 +697,10 @@ ll mod_pow(ll x, ll n, ll mod) {

## Tips

### Array

*   可以利用数组元素的正负性表示存在性(或其他特殊意义)

### Map

*   用于 Hash 化
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