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F - Grid Clipping Problem Statement There is a grid with $H$ rows and $W$ columns. The cell at the $r$-th row from the top and $c$-th column from the 阅读全文
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E - Simple Division Problem Statement You are given integers $N$ and $M$. Find the remainder when $\lfloor N/M \rfloor$ is divided by $\color{red}{100 阅读全文
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G - 221 Subsequence Problem Statement For a sequence $X = (X_1, \dots, X_n)$ of positive integers, we call $X$ a 221 sequence if and only if the lengt 阅读全文
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F. Parabola Independence You are given a set of $n$ quadratic functions $F=\{f_1,f_2,\ldots,f_n \}$, where $f_i(x)=a_i x^2 + b_i x + c_i$. Two functio 阅读全文
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F1. Again Trees... (Easy Version) This is the easy version of the problem. The difference between the versions is that in this version, $k \leq 4$. Yo 阅读全文
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C2. XOR-convenience (Hard Version) This is the hard version of the problem. The difference between the versions is that in this version, $1 \le i \le 阅读全文