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  • [小题狂做]欧拉公式与暴力展开(1)
    题&解

    [小题狂做]欧拉公式与暴力展开(1)

    由于这篇blog语言儒雅随和通俗易懂,所以一般通过观众也可以放心观看 例题(著名题): $\int^{\infty}{0}{\frac{{e^{cosx}}{sin(sinx)}}{x}}dx这道题乍一看很复杂,当时我也想了十万甚至九万分钟,但其实在回顾过3B1B的傅里叶变换后,才发现这是一道可以用傅里叶级……
    HDD 2019年4月21日
  • Orange Boy Can You Solve It Out? EP.3
    OBCYSIO

    Orange Boy Can You Solve It Out? EP.3

    思考题 for everyone Man on Graph Given a graph of N nodes and M edges. On node i there are A_i men. Then each person moves along 1 edge randomly connected to the node he stands. But if two men walked along the same edge, they'll fight and both die.……
    XGN 2019年4月21日
  • Orange Boy Can You Solve It Out? Ep.2
    OBCYSIO

    Orange Boy Can You Solve It Out? Ep.2

    思考题 for everyone Man on Graph You are given M chains each of N+1 nodes. We call the i-th node on the j-th chain (j,i-1). We define a bridge edge connecting (a,b) and (c,d) as follows: - a≠c - b=d - b and d don't equal to N or 0 We made sure that……
    XGN 2019年4月16日
  • Orange Boy Can You Solve It Out? Ep.1
    OBCYSIO

    Orange Boy Can You Solve It Out? Ep.1

    思考题for everyone Dynamic DP You are given: integer arrays A and dp of length N. integer arrays l and r of length N. For each 2\leq i\leq N,1\leq l_i\leq r_i\leq i-1 Known: dp_1=A_1 dp_i=min(dp[l_i,r_i])+A_i for 2\leq i\leq N. Now given q queries:……
    XGN 2019年4月14日
  • 回应赵宇“气”的问题
    题&解

    回应赵宇“气”的问题

    我佛了,空气阻力太难力 111 空气阻力F=kv^2 所以1° 上升时 F=-kv^2-mg dv/dt=-kv^2/m-g ∫(-1/kv^2/m+g)dv=t+v0 左边应该事arctan,所以v=-tanCt+v0,,, 2° 下降时 F=mg-kv^2 ∫(1/mg-kv^2)dv=t+C 有理分式,平方差暴力拆拆↑ 答案应该与e……
    HDD 2019年4月7日