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咱們定文合法的標1只符爲:數字0-9組成的字符串, (能夠包合多個前導0)
定義合法的表達式爲:
1.若X爲合法的標識符,則X爲合法的表達式
2.若X爲合法的表達式,則(X)爲合法的表達式
3.若X和Y均爲合法的表達式,則X+Y, X-Y均爲合法的表達式
如,如下均合法的表:1, 100, 1+2. (10),1-(3-2)
如下爲不合法的表達式: (,-1, 1+-2
給定長度n,求長爲n的合法表達式的數目,長爲n的合法表達式可能有很是多, 你只需輸出結果對1000000007取模的餘數便可.
輸入描述:一個整數n
輸出描述:長度爲n的合法表達式的樹木對1000000007取模的餘數
輸入:1
輸出10
0<=n<=1000
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https://blog.csdn.net/a664607530/article/details/74912459
題目連接:http://codeforces.com/gym/101669
給出k(1≤3001≤300),n(1≤1e51≤1e5),表明一我的要參加k場演唱會,一共有n場演唱會會舉辦。接下來給出每場演唱會要歇息的天數(一共26個樂隊用ABC…Z表明),接下來一行給出n天演唱會舉辦的順序。問這我的按順序參加這k場演唱會有幾種方案。--------------------- https://blog.csdn.net/qq_29556211/article/details/80428339