new file: solutions/P6650.md
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@@ -58,7 +58,7 @@ int main()
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}
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```
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## 90 pts O(m log n)
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## 100 pts O(m log n)
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注意到一个区间内需要多次转移,非常浪费。可以考虑使用矩阵快速幂优化。
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