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[Codeforces Round 642 (Div. 3)] ABCDEF题解 A. Most Unstable Array 思路: 当$n=1$时答案为$\text 0$, 当$n=2$时答案为$\mathit n$, 当$n=3$时答案为$2 n$, 代码: B. Two Arrays And 阅读全文
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[NCD 2019] G. Ali and the Breakfast (解析几何) G. Ali and the Breakfast time limit per test 1 second memory limit per test 256 megabytes input standard in 阅读全文
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[AtCoder Beginner Contest 165] E Rotation Matching (构造) Problem Statement You are going to hold a competition of one to one game called AtCoder Janken 阅读全文
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[2019 ICPC Universidad Nacional de Colombia Programming Contest] 题解 A. Amazon Amazon has grown so much these days, it has decided to build its own sub 阅读全文
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[Educational Codeforces Round 86 (Rated for Div. 2)] E. Placing Rooks (组合数学,容斥定律) E. Placing Rooks time limit per test 2 seconds memory limit per test 阅读全文
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[AtCoder Beginner Contest 164] E Two Currencies (分层最短路) Problem Statement There are NN cities numbered 11 to NN, connected by MM railroads. You are no 阅读全文