#690575 (Go) No.1098 LCAs

• 問題: No.1098 LCAs
• ユーザー: sgsw
• 提出日時: 2021-08-17 22:09:40
• 言語: Go (1.22.1)
• 結果: AC
• 実行時間: 538 ms / 2,000 ms
• コード長: 2,228 bytes
• コンパイル時間: 11,450 ms
• コンパイル使用メモリ: 226,724 KB
• 実行使用メモリ: 83,584 KB
• 最終ジャッジ日時: 2024-04-19 05:40:37
• 合計ジャッジ時間: 19,388 ms
• ジャッジサーバーID （参考情報）: judge4 / judge5

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	1 ms; 5,248 KB
testcase_02	AC	1 ms; 5,376 KB
testcase_03	AC	1 ms; 5,376 KB
testcase_04	AC	1 ms; 5,376 KB
testcase_05	AC	1 ms; 5,376 KB
testcase_06	AC	1 ms; 5,376 KB
testcase_07	AC	1 ms; 5,376 KB
testcase_08	AC	1 ms; 5,376 KB
testcase_09	AC	1 ms; 5,376 KB
testcase_10	AC	1 ms; 5,376 KB
testcase_11	AC	1 ms; 5,376 KB
testcase_12	AC	1 ms; 5,376 KB
testcase_13	AC	3 ms; 5,376 KB
testcase_14	AC	3 ms; 5,376 KB
testcase_15	AC	3 ms; 5,376 KB
testcase_16	AC	3 ms; 5,376 KB
testcase_17	AC	2 ms; 5,376 KB
testcase_18	AC	439 ms; 21,120 KB
testcase_19	AC	425 ms; 21,120 KB
testcase_20	AC	426 ms; 21,120 KB
testcase_21	AC	420 ms; 21,120 KB
testcase_22	AC	426 ms; 21,120 KB
testcase_23	AC	382 ms; 22,144 KB
testcase_24	AC	395 ms; 24,064 KB
testcase_25	AC	387 ms; 22,016 KB
testcase_26	AC	397 ms; 22,016 KB
testcase_27	AC	385 ms; 25,088 KB
testcase_28	AC	532 ms; 81,152 KB
testcase_29	AC	538 ms; 83,584 KB
testcase_30	AC	522 ms; 80,768 KB

ソースコード

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var wg = bufio.NewScanner(os.Stdin)

const (
	inf            = int(1e18)
	initialBufSize = int(1e6)
	maxBufSize     = int(1e6)
)

var buf []byte = make([]byte, initialBufSize)

type Graph struct {
	n     int
	edges [][]int
}

func NewGraph(n int) *Graph {
	g := &Graph{
		n:     n,
		edges: make([][]int, n),
	}
	for i := 0; i < n; i++ {
		g.edges[i] = make([]int, 0)
	}
	return g
}

func (g *Graph) AddEdge(u, v int) {
	g.edges[u] = append(g.edges[u], v)
}

func main() {
	n := nextInt()
	g := NewGraph(n)
	for i := 0; i < n-1; i++ {
		u, v := nextInt(), nextInt()
		u--
		v--
		g.AddEdge(u, v)
		g.AddEdge(v, u)
	}

	//visited
	dist := make([]int, n)
	child := make([]int, n)
	par := make([]int, n)
	prev_sum := make([]int, n)

	dp := make([]int, n)
	for i := 0; i < n; i++ {
		par[i] = -1
		dist[i] = inf
	}

	S := 0
	dist[S] = 0

	var dfs func(int)

	dfs = func(u int) {
		for _, v := range g.edges[u] {
			if dist[v] == inf {
				dist[v] = dist[u] + 1
				par[v] = u
				dfs(v)

			}
		}

		child[u]++
		for _, v := range g.edges[u] {
			if v != par[u] {
				child[u] += child[v]
				dp[u] -= prev_sum[v]
			}
		}
		dp[u] += child[u] * child[u]
		prev_sum[u] = child[u] * child[u]
	}

	dfs(S)

	for _, v := range dp {
		fmt.Printf("%d\n", v)
	}
}

// greatest common divisor (GCD) via Euclidean algorithm
func GCD(a, b int) int {
	for b != 0 {
		t := b
		b = a % b
		a = t
	}
	return a
}
func modInv(a, modulo int) int {
	b := modulo
	u, v := 1, 0
	for b > 0 {
		t := a / b
		a, b = b, a-t*b
		u, v = v, u-t*v
	}
	u %= modulo
	if u < 0 {
		u += modulo
	}
	return u
}

func powMod(x, n, mod int) int {
	retval := 1
	for mul := x; n > 0; {
		if n&1 == 1 {
			retval = retval * mul % mod
		}
		mul = mul * mul % mod
		n >>= 1
	}
	return retval
}

func init() {
	wg.Split(bufio.ScanWords)
	wg.Buffer(buf, maxBufSize)
}

func reverse_array(array []int) []int {
	//reverse the slice
	for i, j := 0, len(array)-1; i < j; i, j = i+1, j-1 {
		array[i], array[j] = array[j], array[i]
	}
	return array
}

func nextInt() int {
	wg.Scan()
	i, e := strconv.Atoi(wg.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func nextStr() string {
	wg.Scan()
	i := wg.Text()
	return i
}