Ryuji is not a good student, and he doesn't want to study. But there are n books he should learn, each book has its knowledge a[i]a[i]. Unfortunately, the longer he learns, the fewer he gets. That means, if he reads books from ll to rr, he will get a…
Trace There's a beach in the first quadrant. And from time to time, there are sea waves. A wave ( xxx , yyy ) means the wave is a rectangle whose vertexes are ( 000 , 000 ), ( xxx , 000 ), ( 000 , yyy ), ( xxx , yyy ). Every time the wave will wash o…
There's a beach in the first quadrant. And from time to time, there are sea waves. A wave ( xx , yy) means the wave is a rectangle whose vertexes are ( 00 , 00 ), ( xx , 00 ), ( 00 , yy ), ( xx , yy ). Every time the wave will wash out the trace of f…
Morgana is learning computer vision, and he likes cats, too. One day he wants to find the cat movement from a cat video. To do this, he extracts cat features in each frame. A cat feature is a two-dimension vector <xx, yy>. If x_ixi = x_jxjand y_iy…
题意: 1.区间求 a[l]×L+a[l+1]×(L−1)+⋯+a[r−1]×2+a[r](L is the length of [ l, r ] that equals to r - l + 1) 2.单点修改 解析: 只有这两个操作 并且区间求得值与前缀和极为相似 所以嘛 就要想到树状数组 树状数组能够维护前缀和 所以区间 [ l, r ] 就是r的前缀和减去l的前缀和 但每个a[i]的系数都不同 求前缀和无用..所以要想到化简一下 把每个a[i]的系数都化为一样的或者定量 由上面的式子化…
目录 A. Hard to prepare B.BE, GE or NE F.Features Track G.Trace H.Ryuji doesn't want to study I.Characters with Hash J. Maze Designer A. Hard to prepare After Incident, a feast is usually held in Hakurei Shrine. This time Reimu asked Kokoro to deliver…
A prime number (or a prime) is a natural number greater than 11 that cannot be formed by multiplying two smaller natural numbers. Now lets define a number NN as the supreme number if and only if each number made up of an non-empty subsequence of all…
262144K Ryuji is not a good student, and he doesn't want to study. But there are n books he should learn, each book has its knowledge a[i]a[i]. Unfortunately, the longer he learns, the fewer he gets. That means, if he reads books from ll to rr, he…
