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Given a binary string S[1,…,N]S[1,…,N] (i.e. a sequence of 0’s and 1’s), and QQ queries on the string. There are two types of queries: Flippin... 阅读全文
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In computer vision, a chain code is a sequence of numbers representing directions when following the contour of an object. For example, the fo... 阅读全文
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Lulu has a sweet tooth. Her favorite food is ring donut. Everyday she buys a ring donut from the same bakery. A ring donut is consists of nn p... 阅读全文
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https://loj.ac/problem/528不含平方因子的数才会有 -1 和 1才会对结果造成影响， 所有排除掉所有含有平方因子的数就好开始的时候平方是1 就是没有平方因子的情况，减去所有平方因子的情况#include using namespace std;const in... 阅读全文
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int miniexpress (char* s, int n) { int p = 0, q = 1; while (p 0) j=j+k+1; else i=i+k+... 阅读全文