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咱们定文合法的标1只符为:数字0-9组成的字符串, (能够包合多个前导0)
定义合法的表达式为:
1.若X为合法的标识符,则X为合法的表达式
2.若X为合法的表达式,则(X)为合法的表达式
3.若X和Y均为合法的表达式,则X+Y, X-Y均为合法的表达式
如,如下均合法的表:1, 100, 1+2. (10),1-(3-2)
如下为不合法的表达式: (,-1, 1+-2
给定长度n,求长为n的合法表达式的数目,长为n的合法表达式可能有很是多, 你只需输出结果对1000000007取模的余数便可.
输入描述:一个整数n
输出描述:长度为n的合法表达式的树木对1000000007取模的余数
输入:1
输出10
0<=n<=1000
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https://blog.csdn.net/a664607530/article/details/74912459
题目连接:http://codeforces.com/gym/101669
给出k(1≤3001≤300),n(1≤1e51≤1e5),表明一我的要参加k场演唱会,一共有n场演唱会会举办。接下来给出每场演唱会要歇息的天数(一共26个乐队用ABC…Z表明),接下来一行给出n天演唱会举办的顺序。问这我的按顺序参加这k场演唱会有几种方案。--------------------- https://blog.csdn.net/qq_29556211/article/details/80428339