原文:Educational Codeforces Round 77 (Rated for Div. 2)

A. Heating Several days ago you bought a new house and now you are planning to start a renovation. Since winters in your region can be very cold you need to decide how to heat rooms in your house. You ...

2019-11-28 00:06 0 308 推薦指數:

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Educational Codeforces Round 76 (Rated for Div. 2)

A - Two Rival Students 題意:共n個人排一排,兩個人,位於a,b,相鄰位置交換至多x次,最大化abs(a-b)的值。 題解:每次交換至多+1,不能超過n-1。 B - ...

Thu Nov 14 16:50:00 CST 2019 2 298
Educational Codeforces Round 101 (Rated for Div. 2)

題目鏈接:https://codeforces.com/contest/1469 A.Regular Bracket Sequence 題目大意:給你含有一個( 和一個 ),其他全是 ?的字符串,判斷該字符串是否合法 題目思路:特判:①如果開頭 )結尾( ,不合法②如果 ? 的個數是奇數 ...

Wed Dec 30 01:06:00 CST 2020 2 275
Educational Codeforces Round 103 (Rated for Div. 2)

Educational Codeforces Round 103 A. K-divisible Sum 題意 給定 n , k 構造出長度為 n 的正整數序列, 使得序列的和是 k 的倍數,求最大值的最小值 思路 當 \(n \le k\) 時候,答案是 \(\lceil \dfrac ...

Sat Jan 30 17:58:00 CST 2021 0 295
Educational Codeforces Round 114 (Rated for Div. 2)

A. Regular Bracket Sequences 思路: 枚舉,我們讓出現先連續左括號和出現右括號的數量一一對應,我們從連續出現n個左括號開始枚舉,下一次枚舉是先連續出現n-1個左括號,在 ...

Wed Sep 22 00:46:00 CST 2021 2 130
Educational Codeforces Round 86 (Rated for Div. 2)

題目傳送門 A. Road To Zero 兩個數,將其中一個增加或減少1的代價為a,同時增加或減少1的代價為b,求將兩個數同時變為0的最小代價。 當一個數為0或者兩個數異號時,最優為只執行代價 ...

Mon Apr 27 18:07:00 CST 2020 5 308
Educational Codeforces Round 105 (Rated for Div. 2)

Educational Codeforces Round 105 (Rated for Div. 2) A - ABC String 第一個字母只能是 '(', 最后一個字母不等於第一個字母且只能是 ')' 所以就剩下一個字母沒確定, 直接分情況討論兩邊即可 B - Berland ...

Wed Mar 03 18:34:00 CST 2021 3 355
Educational Codeforces Round 100 (Rated for Div. 2)

Educational Codeforces Round 100 (Rated for Div. 2) A - Dungeon 貪心 B - Find The Array 每個b只含有一個二進制下的1, 必定相互之間可整除, 選擇最接近 a[i] 的2的階乘即可 或者還有一種解法 ...

Sat Dec 19 03:14:00 CST 2020 5 366
Educational Codeforces Round 107 (Rated for Div. 2)

Educational Codeforces Round 107 (Rated for Div. 2) 傳送門 E. Colorings and Dominoes 題意: 給一個n * m的矩陣,o表示可以安排為紅格子或藍格子,然后在將一個1 * 2大小的小矩陣放入大矩陣中,橫着放只能放在 ...

Tue Apr 13 18:08:00 CST 2021 0 348
 
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