FFT make make runfft usage cat Data.txt | runfft > ans.txt in Data.txt, there should be $N$ float value, where $\exists k \in N, N = 2^k$. WAV sources ID Music Name URL Sources 0001 Sine:C4 N/A 0002 Sine:C4,E4,G4,C5 N/A 0003 啥啊 https://www.bilibili.com/video/BV15r4y1E72p/ 0004 我家的天空没法下雨 https://www.bilibili.com/video/BV1bZ4y1U7ah/ 0005 我丢了半杯奶茶 https://www.bilibili.com/video/BV1xS4y1G7az/ 0006 红丝绒蛋糕 https://www.bilibili.com/video/BV1Ub4y1q7Cv/ 0007 我在雨中旋转 https://www.bilibili.com/video/BV1bB4y1c7X4/ 0008 DECO*27 - 爱言叶Ⅲ feat. https://www.bilibili.com/video/BV1VW41127aW/ 0009 请踢断我的肋骨吧 https://www.bilibili.com/video/BV1GJ411J7wG/ 0010 DECO*27 - 愛言葉Ⅳ feat. https://www.bilibili.com/video/BV1u54y1f7mY/ 0011 我多想说再见啊 https://www.bilibili.com/video/BV1dP4y1T7TU/ 0012 大梦仙缘 https://www.bilibili.com/festival/VSF2022live?bvid=BV1PU4y1F7Vp 0013 《哈利波特·学院印象曲系列》赫奇帕奇 https://www.bilibili.com/video/BV1tL4y1Y7iF/ 0014 《哈利波特·学院印象曲系列》斯莱特林 https://www.bilibili.com/video/BV1DJ411w7Qw/ 0015 绝涮双娇 https://www.bilibili.com/video/BV1HS4y1y7nL/ 0016 畸形维纳斯 https://www.bilibili.com/video/BV15Q4y1m7uq/ 0017 我的稻草人 https://www.bilibili.com/video/BV1e64y1s7Cg/ 0018 夏风 https://www.bilibili.com/video/BV1Ux411F7Nh/ 0019 二十三 https://www.bilibili.com/video/BV1hi4y1j7e2/ 0020 白石溪 https://www.bilibili.com/video/BV1Ws411X7BJ/ 0021 我的悲伤是水做的 https://www.bilibili.com/video/BV1Qc411h7Ys/ 0022 夏日放映室 https://www.bilibili.com/video/BV1RJ411x7uQ/ 0023 剑器行 https://www.bilibili.com/video/BV1EJ411k7gu/ 0024 好累啊 https://www.bilibili.com/video/BV1Ws41137Yk/ 0025 光与影的对白 https://www.bilibili.com/festival/lty10th?bvid=BV1dZ4y1Y7bt 0026 牵丝戏 https://www.bilibili.com/video/BV1Rs411D79b/