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Educational Codeforces Round 22 E. Army Creation（主席树）

As you might remember from our previous rounds, Vova really likes computer games. Now he is playing a strategy game known as Rage of Empires. In the game Vova can hire n different warriors; ith warrior has the type a**i. Vova wants to create a balanced ar

0526. Beautiful Arrangement (M)

Beautiful Arrangement (M) 题目 Suppose you have n integers from 1 to n. We define a beautiful arrangement as an array that is constructed by these n numbers successfully if one of the following is true for the ith position (1 <= i <= n) in this array:

递归

PART 1-要点 1.1递归式 将原问题划分成子问题 1.2 递归出口 终止的条件 1.3 界函数 问题规模变化的函数 ！注意：由于函数的局部变量是存在栈上的， 如果有体积大的局部变量比如数组而递归 如果有体积大的局部变量，比如数组，而递归 层次又可能很深的情况下，也许会导致栈溢出， 因此可以考虑使

bingoyes' tiny dream

Gauss Elimination bool Gauss(){ int now=1,nxt; double t; R(i,1,n){ //enumerate the column for(nxt=now;nxt<=n;++nxt) if(fabs(a[nxt][i])>eps)break; //find a nonzero element in the ith row as 'nxt'

526. Beautiful Arrangement

Suppose you have N integers from 1 to N. We define a beautiful arrangement as an array that is constructed by these N numbers successfully if one of the following is true for the ith position (1 <= i <= N) in this array: The number at the ith posit