#683103 (Go) No.1623 三角形の制作

• 問題: No.1623 三角形の制作
• ユーザー: c-yan
• 提出日時: 2021-07-24 12:25:11
• 言語: Go (1.22.1)
• 結果: AC
• 実行時間: 436 ms / 2,000 ms
• コード長: 2,042 bytes
• コンパイル時間: 16,569 ms
• コンパイル使用メモリ: 229,060 KB
• 実行使用メモリ: 136,448 KB
• 最終ジャッジ日時: 2024-07-19 17:19:32
• 合計ジャッジ時間: 20,145 ms
• ジャッジサーバーID （参考情報）: judge2 / judge5

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	2 ms; 5,376 KB
testcase_02	AC	418 ms; 128,708 KB
testcase_03	AC	402 ms; 128,896 KB
testcase_04	AC	413 ms; 136,192 KB
testcase_05	AC	436 ms; 133,888 KB
testcase_06	AC	405 ms; 130,432 KB
testcase_07	AC	411 ms; 130,304 KB
testcase_08	AC	395 ms; 131,968 KB
testcase_09	AC	408 ms; 133,120 KB
testcase_10	AC	424 ms; 129,536 KB
testcase_11	AC	422 ms; 136,448 KB
testcase_12	AC	13 ms; 5,376 KB
testcase_13	AC	17 ms; 5,376 KB
testcase_14	AC	16 ms; 5,376 KB
testcase_15	AC	41 ms; 7,552 KB
testcase_16	AC	41 ms; 7,552 KB
testcase_17	AC	40 ms; 7,552 KB
testcase_18	AC	44 ms; 7,552 KB
testcase_19	AC	20 ms; 5,376 KB
testcase_20	AC	1 ms; 5,376 KB

ソースコード

package main

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

// BIT stands for binary indexed tree.
type BIT []int

func newBIT(n int) BIT {
	return make([]int, n)
}

func (bit BIT) add(i, v int) {
	for i++; i <= len(bit); i += i & -i {
		bit[i-1] += v
	}
}

func (bit BIT) sum(i int) int {
	result := 0
	for i++; i > 0; i -= i & -i {
		result += bit[i-1]
	}
	return result
}

func (bit BIT) query(start int, stop int) int {
	return bit.sum(stop-1) - bit.sum(start-1)
}

func max(x, y int) int {
	if x > y {
		return x
	}
	return y
}

func main() {
	defer flush()

	n := readInt()
	r := make([]int, n)
	for i := 0; i < n; i++ {
		r[i] = readInt()
	}
	g := make([]int, n)
	for i := 0; i < n; i++ {
		g[i] = readInt()
	}
	b := make([]int, n)
	for i := 0; i < n; i++ {
		b[i] = readInt()
	}

	rr := make([]int, 3001)
	for i := 0; i < n; i++ {
		rr[r[i]]++
	}
	gg := make([]int, 3001)
	for i := 0; i < n; i++ {
		gg[g[i]]++
	}
	bb := make([]int, 3001)
	for i := 0; i < n; i++ {
		bb[b[i]]++
	}

	gb := make([][]int, 3001)
	for i := 0; i < 3001; i++ {
		if gg[i] == 0 {
			continue
		}
		for j := 0; j < 3001; j++ {
			if bb[j] == 0 {
				continue
			}
			gb[max(i, j)] = append(gb[max(i, j)], i<<12+j)
		}
	}

	result := 0
	bit := newBIT(6001)
	for i := 0; i < 3001; i++ {
		for _, x := range gb[i] {
			i := x >> 12
			j := x & 4095
			bit.add(i+j, gg[i]*bb[j])
		}
		result += rr[i] * bit.query(i+1, 6001)

	}
	println(result)
}

const (
	ioBufferSize = 1 * 1024 * 1024 // 1 MB
)

var stdinScanner = func() *bufio.Scanner {
	result := bufio.NewScanner(os.Stdin)
	result.Buffer(make([]byte, ioBufferSize), ioBufferSize)
	result.Split(bufio.ScanWords)
	return result
}()

func readString() string {
	stdinScanner.Scan()
	return stdinScanner.Text()
}

func readInt() int {
	result, err := strconv.Atoi(readString())
	if err != nil {
		panic(err)
	}
	return result
}

var stdoutWriter = bufio.NewWriter(os.Stdout)

func flush() {
	stdoutWriter.Flush()
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdoutWriter, args...)
}