#690573 (Go) No.1098 LCAs

• 問題: No.1098 LCAs
• ユーザー: sgsw
• 提出日時: 2021-08-17 22:06:57
• 言語: Go (1.22.1)
• 結果: RE
• 実行時間: -
• コード長: 1,418 bytes
• コンパイル時間: 11,280 ms
• コンパイル使用メモリ: 233,844 KB
• 実行使用メモリ: 9,564 KB
• 最終ジャッジ日時: 2024-04-19 05:34:44
• 合計ジャッジ時間: 13,409 ms
• ジャッジサーバーID （参考情報）: judge1 / judge4

入力	結果	実行時間; 実行使用メモリ
testcase_00	RE	-
testcase_01	RE	-
testcase_02	AC	2 ms; 5,376 KB
testcase_03	RE	-
testcase_04	RE	-
testcase_05	RE	-
testcase_06	RE	-
testcase_07	RE	-
testcase_08	RE	-
testcase_09	RE	-
testcase_10	RE	-
testcase_11	RE	-
testcase_12	RE	-
testcase_13	RE	-
testcase_14	RE	-
testcase_15	RE	-
testcase_16	RE	-
testcase_17	RE	-
testcase_18	RE	-
testcase_19	RE	-
testcase_20	RE	-
testcase_21	RE	-
testcase_22	RE	-
testcase_23	RE	-
testcase_24	RE	-
testcase_25	RE	-
testcase_26	RE	-
testcase_27	RE	-
testcase_28	RE	-
testcase_29	RE	-
testcase_30	RE	-

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)
	}
}

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