k3forx/atcoder

atcoder

Progress

AtCoder Beginner Contest (ABC)

• 239 (2022/02/19)

  • A: Horizon
  • B: Integer Division
  • C: Knight Fork
  • D: Prime Sum Game
  • E: Subtree K-th Max
  • F: Construct Highway
  • G: Builder Takahashi
  • Ex: Dice Product 2

• 240 (2022/02/20)

  • A:

AtCoder Educational DP Contest

• A: Frog 1
• B: Frog 2

C++

vector<vector<int>> matrix(RR, vector<int>(CC));

// sort
sort(seq.begin(), seq.end())

// max integer
long long res = 1LL << 60;

//文字列抽出
string str = "";
str.substr(開始位置, 取り出す長さ);

// int to string
to_string()

Sort

• https://pkg.go.dev/sort

package main

import (
	"fmt"
	"sort"
)

func main() {
	ints := []int{5, 1, 9, 2, 3, 8}
	sort.Ints(ints)
	fmt.Println(ints)

	sort.Sort(sort.Reverse(sort.IntSlice(ints)))
	fmt.Println(ints)
}

Unique

• https://atcoder.jp/contests/abs/tasks/abc085_b

package main

import "fmt"

func main() {
	var n int
	fmt.Scan(&n)

	nums := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Scan(&nums[i])
	}

	m := map[int]bool{}
	var uniqueNums []int
	for _, num := range nums {
		if !m[num] {
			m[num] = true
			uniqueNums = append(uniqueNums, num)
		}
	}
	fmt.Println(len(uniqueNums))
}