SRM666
WalkOverATree: 找最长链作为不回头的路（×1），贪心走其他回头的路（×2）。
SumOverPermutations: DP，$f[i][j]$表示放了$i$个元素且当前有$j$个连续段。
CountBinarySequences: 把区间构出树来之后矩阵乘法DP。
TCO15 Round 2D
BalancedSubstrings: 暴力扫过去。
BallsInBoxes: 把长度为$N-K+1$的答案区间分成一段段长度为$K$的区间，把最后一段整区间与最后的多余部分合起来。在每段区间内二分即可。
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2018年10月26日 21:52
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2019年10月21日 03:29
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2022年8月28日 12:48
Bangladesh Education Board DPE has conducted the class 8th grade of Junior School Certificate Exam and Junior Dakhil Certificate Exam on 1st to 15th November 2022 at all centers in division wise under Ministry of Primary and Mass Education (MOPME), and the class 8th grade terminal examination tests are successfully conducted for all eligible JSC/JDC students for the academic year of 2022. Junior Dakil Result Barisal Board The Bangladesh government Minister of Secondary Education is going to announce the JSC Result 2022 in student wise for division students in education board wise, and the result documents will be submitted to the Prime Minister of the country after then the result with mark sheet will be announced to public to check the individual result.