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16-oesnuj #50

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@oesnuj oesnuj commented Sep 13, 2024

๐Ÿ”— ๋ฌธ์ œ ๋งํฌ

๋ฐฑ์ค€ | ๋‹ฌ๋ ฅ

โœ”๏ธ ์†Œ์š”๋œ ์‹œ๊ฐ„

40๋ถ„

โœจ ์ˆ˜๋„ ์ฝ”๋“œ

์–ด๋–ป๊ฒŒ ํ’€์–ด์•ผ ํ• ์ง€ ์ ‘๊ทผ์— ์‹œ๊ฐ„์ด ๊ฑธ๋ ธ์ง€๋งŒ, ํ•ต์‹ฌ์€ ์—ฐ์†๋œ ์ผ์ •์˜ ๊ธธ์ด(๋„ˆ๋น„)์™€ ๊ฐ€์žฅ ์ผ์ •์ด ๋งŽ์€ ๋‚ (๋†’์ด)๋ฅผ ๊ตฌํ•˜๋Š” ๊ฒƒ์ด์—ˆ์Šต๋‹ˆ๋‹ค. ์ด๋ฅผ ํ†ตํ•ด ๋ถ™์ผ ์ฝ”ํŒ…์ง€์˜ ๋„“์ด๋ฅผ ๊ณ„์‚ฐํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

๐Ÿ”‘ ํ•ต์‹ฌ

  • ์—ฐ์†๋œ ์ผ์ • ๊ตฌ๊ฐ„์˜ ๋„ˆ๋น„: ์ผ์ •์ด ๋Š๊ธฐ์ง€ ์•Š๊ณ  ์ด์–ด์ง€๋Š” ๊ตฌ๊ฐ„์„ ํŒŒ์•…ํ•ฉ๋‹ˆ๋‹ค.
  • ์—ฐ์† ๊ตฌ๊ฐ„ ๋‚ด ์ตœ๋Œ€ ๋†’์ด: ํ•ด๋‹น ๊ตฌ๊ฐ„์—์„œ ๊ฒน์นœ ์ผ์ •์ด ๊ฐ€์žฅ ๋งŽ์€ ๋‚ ์˜ ๋†’์ด๋ฅผ ๊ณ„์‚ฐํ•ฉ๋‹ˆ๋‹ค.
    ์ด ๋‘ ์š”์†Œ๋ฅผ ๊ณฑํ•˜๋ฉด, ํ•ด๋‹น ๊ตฌ๊ฐ„์—์„œ ๋ถ™์—ฌ์•ผ ํ•  ์ฝ”ํŒ…์ง€์˜ ๋„“์ด๊ฐ€ ๋‚˜์˜ต๋‹ˆ๋‹ค.
  1. ์ผ์ • ์ž…๋ ฅ
    0์œผ๋กœ ์ดˆ๊ธฐํ™” ๋œ 365ํฌ๊ธฐ์˜ ๋ฐฐ์—ด ์ƒ์„ฑ
    ์ผ์ •์ด ์‹œ์ž‘ํ•˜๋Š” ๋‚ ๋ถ€ํ„ฐ ๋๋‚˜๋Š” ๋‚ ๊นŒ์ง€ ํ•ด๋‹น ๋ฐฐ์—ด ๊ฐ’์„ 1์”ฉ ์ฆ๊ฐ€์‹œ์ผœ ๊ฒน์น˜๋Š” ์ผ์ •์„ ๊ธฐ๋กํ•ฉ๋‹ˆ๋‹ค.

  2. ์—ฐ์†๋œ ์ผ์ • ๊ตฌ๊ฐ„ ์ฐพ๊ธฐ (= ๋„ˆ๋น„)
    ๋ฐฐ์—ด์—์„œ ๊ฐ’์ด 0์ด ์•„๋‹Œ ๊ฒฝ์šฐ, ๊ทธ๋‚ ์€ ์ผ์ •์ด ์žˆ๋Š” ๋‚ ์ด๋ฏ€๋กœ ์ด๋ฅผ ๊ธฐ์ค€์œผ๋กœ ์—ฐ์†๋œ ์ผ์ •์˜ ๋„ˆ๋น„๋ฅผ ๊ตฌํ•ฉ๋‹ˆ๋‹ค.

  3. ์—ฐ์†๋œ ๊ตฌ๊ฐ„ ๋‚ด ์ตœ๋Œ€ ์ผ์ • ์ˆ˜ (= ๋†’์ด)
    ํ•ด๋‹น ๊ตฌ๊ฐ„์—์„œ ์ผ์ •์ด ๊ฒน์นœ ๋‚ ๋“ค์˜ ์ˆ˜(๋ฐฐ์—ด ๊ฐ’)๋ฅผ ๊ธฐ์ค€์œผ๋กœ ์ตœ๋Œ€ ๋†’์ด๋ฅผ ๊ตฌํ•ฉ๋‹ˆ๋‹ค.

  4. ๋„“์ด ๊ณ„์‚ฐํ•˜๊ธฐ
    ๊ตฌ๊ฐ„์˜ ๋„ˆ๋น„์™€ ๋†’์ด๋ฅผ ๊ณฑํ•ด ํ•ด๋‹น ๊ตฌ๊ฐ„์˜ ๋„“์ด๋ฅผ ๊ตฌํ•ฉ๋‹ˆ๋‹ค.
    ๊ตฌ๊ฐ„์˜ ๋„“์ด๋ฅผ ๊ตฌํ•œ ํ›„์—๋Š” width์™€ height ๊ฐ’์„ ๋‹ค์‹œ 0์œผ๋กœ ์ดˆ๊ธฐํ™”ํ•˜์—ฌ ๋‹ค์Œ ์—ฐ์†๋œ ๊ตฌ๊ฐ„์„ ๊ณ„์‚ฐํ•ฉ๋‹ˆ๋‹ค.

์˜ˆ์‹œ:

์—ฐ์†๋œ ์ผ์ • ๊ตฌ๊ฐ„์ด [1, 1, 2, 2, 3, 0, 0]์ผ ๋•Œ,
๋„ˆ๋น„๋Š” 5(์—ฐ์†๋œ ๋‚ ์˜ ์ˆ˜),
๋†’์ด๋Š” 3(๊ฐ€์žฅ ๋งŽ์ด ๊ฒน์นœ ์ผ์ • ์ˆ˜)๋กœ ๊ณ„์‚ฐ๋ฉ๋‹ˆ๋‹ค.
๋”ฐ๋ผ์„œ ๋ถ™์ผ ์ฝ”ํŒ…์ง€ ๋„“์ด๋Š” 5 * 3 = 15๊ฐ€ ๋ฉ๋‹ˆ๋‹ค.

๐Ÿ—‚ C++ ์ฝ”๋“œ

#include <iostream>
#include <vector>
using namespace std;

struct EventPeriod
{
    int start, end;
};

int main()
{
    int N;
    cin >> N;
    vector <EventPeriod> v(N);
    int days[365] = {0};

    for(int i = 0; i < N; i++)
    {
        cin >> v[i].start >> v[i].end; //์ผ์ • ์‹œ์ž‘์ผ, ์ข…๋ฃŒ์ผ ์ž…๋ ฅ๋ฐ›๊ธฐ

        // ์‹œ์ž‘์ผ๋ถ€ํ„ฐ ์ข…๋ฃŒ์ผ๊นŒ์ง€ ์ผ์ •์ด ์žˆ๋Š” ๋‚ ๋“ค์— ์นด์šดํŠธ ์ฆ๊ฐ€
        for (int k = v[i].start - 1; k < v[i].end; k++) {
            days[k]++; //์ผ์ •์ด ํฌํ•จ๋œ ๋‚ ์˜ ๋ฐฐ์—ด ๊ฐ’ +1;
        }
    }

    int result = 0;
    int height = 0, width = 0;
    // 365์ผ์„ ํƒ์ƒ‰ํ•˜๋ฉฐ ์—ฐ์†๋œ ๊ตฌ๊ฐ„์„ ๊ณ„์‚ฐ
    for (int i = 0; i < 365; i++) {
        if (days[i] != 0) {  // ์ผ์ •์ด ์žˆ๋Š” ๋‚ ์ด๋ฉด ๋„ˆ๋น„์™€ ๋†’์ด ๊ณ„์‚ฐ
            width++;
            height = max(height, days[i]);
        }
        
        if (days[i + 1] == 0) {  // ์ผ์ •์ด ์—†๋Š” ๋‚ ์ด ๋‚˜์˜ค๋ฉด ๋„“์ด ๊ณ„์‚ฐ ํ›„ ์ดˆ๊ธฐํ™”
            result += height * width; //์—ฐ์†๋œ ๊ตฌ๊ฐ„์ด ๋Š์–ด์งˆ๋•Œ ๋„“์ด ๊ณ„์‚ฐ
            width = 0;
            height = 0;
        }
    }
    cout << result;
    return 0;
}

๐Ÿ“š ์ƒˆ๋กญ๊ฒŒ ์•Œ๊ฒŒ๋œ ๋‚ด์šฉ

์ฒ˜์Œ์—๋Š” ๋ฐฑ์ค€ ๋ฌธ์ œ์— ๊ทธ๋ ค์ง„ ๊ทธ๋ฆผ์ฒ˜๋Ÿผ ๋ณต์žกํ•˜๊ฒŒ ์ž๋ฃŒ ๊ตฌ์กฐ๋ฅผ ๊ตฌ์„ฑํ•ด์•ผ ํ•˜๋‚˜ ๊ณ ๋ฏผํ–ˆ์ง€๋งŒ ๋ฐฐ์—ด์„ ํ™œ์šฉํ•ด ๊ฐ„๋‹จํ•˜๊ฒŒ ์ฒ˜๋ฆฌํ•  ์ˆ˜ ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค!

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ํ—‰ ๋ฌธ์ œ์— ์ œ ์ด๋ฆ„์ด,,,๋จผ๊ฐ€ ๋ฐ˜๊ฐ‘๋„ค์š”ใ…Žใ…Ž
๋ฌธ์ œ๊ฐ€ ๋ญ”๊ฐ€ ์‹ ๋ฐ•ํ•˜๋ฉด์„œ ์žฌ๋ฐŒ๋„ค์š”!! ์ผ์ •์ด ์žˆ์œผ๋ฉด์„œ ์—ฐ์†ํ•œ ๋‚ ์งœ์ธ ๊ฒฝ์šฐ ํ•˜๋‚˜์˜ ์ง์‚ฌ๊ฐํ˜•์— ํฌํ•จํ•˜์—ฌ ์ฝ”ํŒ…์ง€๋ฅผ ๋ถ™์ด๋Š” ๊ฑฐ๋„ค์š”! ์ฒจ์—” ๋‹จ์ˆœํžˆ ์ด ์กฐ๊ฑด์„ ๋งŒ์กฑํ•˜๋Š” ์ง์‚ฌ๊ฐํ˜•๋งŒ ์ฐพ์œผ๋ฉด ๋˜๋Š”๊ฑด๊ฐ€? ์‹ถ์—ˆ๋Š”๋ฐ, ์—ญ์‹œ ์ข€ ๋” ์ฝ์–ด๋ณด๋‹ˆ ์‹œ์ž‘๋‚ ์งœ์™€ ์ข…๋ฃŒ๋‚ ์งœ๋ฅผ ๊ณ ๋ คํ•˜์—ฌ ์‹œ์ž‘์ผ์ด ๊ฐ™์„ ๊ฒฝ์šฐ ์ผ์ •์˜ ๊ธฐ๊ฐ„์ด ๊ธด ๊ฒƒ์ด ๋จผ์ € ์ฑ„์›Œ์ง€๋ฉฐ ๋ชจ๋“  ์ผ์ •์˜ ๊ธธ์ด๋ฅผ ํ•ฉํ•œ ํฌ๊ธฐ์˜ ์ง์‚ฌ๊ฐํ˜•์„ ๊ตฌํ•ด์•ผ ํ•œ๋‹ค๋Š” ๊ฒƒ์„ ์•Œ์•˜์–ด์š”. ๋จธ๋ฆฌ๋กœ ์ดํ•ด๋Š” ๋˜๋Š”๋ฐ,,, ์ด๊ฑธ ์–ด๋–ป๊ฒŒ ๊ตฌํ˜„ํ•ด์•ผ ํ•˜๋‚˜,,,ํ–ˆ๋Š”๋ฐ!

์ƒ๊ฐํ•ด๋ณด๋‹ˆ, ์ผ์ •์ด ์žˆ๋Š” ๋‚ ์ด ์–ธ์ œ๋“ ์ง€ ์ฝ”ํŒ…์ง€๋Š” ํ•ญ์ƒ ์ง์‚ฌ๊ฐํ˜•์ด๊ณ , ์ผ์ •์ด ์—†๋Š” ๋‚ ์งœ๋ฅผ ์ œ์™ธํ•˜๊ณ ๋Š” ์ผ์ •์ด 1๊ฐœ๋“  ์—ฌ๋Ÿฌ๊ฐœ๋“  ์ผ์ •์ด ์žˆ๋Š” ๊ฒƒ์ด๋ฏ€๋กœ ์ฝ”ํŒ…์ง€๋ฅผ ๋ถ™์—ฌ์•ผ ํ•˜๋‹ˆ๊นŒ ์ผ์ •์ด ์—†๋Š” ๋‚ ์งœ๋ฅผ ์ฐพ๊ธฐ ์ „๊นŒ์ง€์˜ ๋‚ ์งœ๊นŒ์ง€๋ฅผ ์ง์‚ฌ๊ฐํ˜•์œผ๋กœ ๋งŒ๋“ค๋ฉด ์ข€ ์‰ฌ์šธ ๊ฒƒ ๊ฐ™๋”๋ผ๊ตฌ์š”!

๊ทธ๋ž˜์„œ, ์ €๋„ ์ค€์„œ๋‹˜์ฒ˜๋Ÿผ ๋ฐฐ์—ด์„ ์ด์šฉํ–ˆ๋Š”๋ฐ, ์ƒ๊ฐํ•œ ๊ตฌํ˜„ ๋ฐฉ๋ฒ•์ด ์ค€์„œ๋‹˜๊ณผ ์™„์ „ ๊ฐ™๋„ค์š”! ๋‹ฌ๋ ฅ์˜ ๊ฐ ๋‚ ์งœ๋งˆ๋‹ค ์ผ์ •์ด ๋ช‡๊ฐœ์ธ์ง€ ์นด์šดํŠธํ•˜๊ณ , ์ผ์ •์ด ์—†๋Š” ๋‚ ์„ ์ฐพ์œผ๋ฉด ๊ทธ ์ „๊นŒ์ง€์˜ ๋‚ ์งœ์˜ ๊ธธ์ด๋ฅผ ๊ตฌํ•˜์—ฌ ์ง์‚ฌ๊ฐํ˜•์„ ๊ตฌํ•˜๋Š”๋ฐ, ๊ฐ€๋กœ์˜ ๊ธธ์ด๊ฐ€ ์—ฐ์†๋œ ๋‚ ์งœ๊ฐ€ ๋˜๊ณ  ์„ธ๋กœ์˜ ๊ธธ์ด๋Š” ๊ฐ ๋‚ ์งœ ์ค‘ ๊ฐ€์žฅ ๋งŽ์€ ์ผ์ •์˜ ์ˆ˜๊ฐ€ ๋˜๋ฏ€๋กœ ๊ฐ ๊ฐ’์„ ๊ณฑํ•˜๋ฉด ์ง์‚ฌ๊ฐํ˜•์˜ ๋„“์ด๋ฅผ ๊ตฌํ•  ์ˆ˜ ์žˆ๋”๋ผ๊ตฌ์š”! ์ƒ๊ฐ๋ณด๋‹ค ๊ฐ„๋‹จํ•˜๊ณ  ์žฌ๋ฐŒ๋Š” ๋ฌธ์ œ์ธ ๊ฒƒ ๊ฐ™์•„์š”~๐Ÿ˜„

์ค€์„œ๋‹˜๊ณผ ์™„์ „ ๊ฐ™์€ ๋…ผ๋ฆฌ์ธ ๊ฒƒ ๊ฐ™์€๋ฐ,,,

  1. ์ผ์ •์˜ ๊ฐœ์ˆ˜๋ฅผ ์ž…๋ ฅ๋ฐ›๋Š”๋‹ค.
  2. ๋‹ฌ๋ ฅ์„ 1์ฐจ์› ๋ฐฐ์—ด๋กœ ๋งŒ๋“ ๋‹ค.
  3. 0๋ฒˆ์งธ ๋ฐฐ์—ด๋ถ€ํ„ฐ 1์ผ์ด ๋œ๋‹ค.
  4. ์ผ์ •์˜ ๊ฐœ์ˆ˜๋งŒํผ ๋ฐ˜๋ณตํ•˜์—ฌ ๊ฐ ์ผ์ •์˜ ์‹œ์ž‘๋‚ ์งœ์™€ ์ข…๋ฃŒ๋‚ ์งœ๋ฅผ ์ž…๋ ฅ๋ฐ›๋Š”๋‹ค.
  5. ๋ฐ˜๋ณตํ•˜์—ฌ ์ผ์ •์ด ์—†๋Š” ๋‚ ์ด ๋‚˜์˜ฌ ๋•Œ๊นŒ์ง€ ๊ฐ ๋‚ ์งœ์˜ ์ผ์ • ๊ฐœ์ˆ˜๋ฅผ ์นด์šดํŠธํ•˜์—ฌ ๋ฐฐ์—ด์— ์ €์žฅํ•œ๋‹ค.
  6. ์ผ์ •์ด ์—†๋Š” ๋‚ ์„ ์ฐพ์œผ๋ฉด ๋ฐ˜๋ณต์„ ๋ฉˆ์ถ”๊ณ  ์ด์ „๊นŒ์ง€ ๊ตฌํ•œ ๊ฐ’ ์ค‘ ๊ฐ€์žฅ ํฐ ๊ฐ’์„ ์ฐพ๋Š”๋‹ค.
  7. ์ฐพ์€ ๊ฐ€์žฅ ํฐ ๊ฐ’์€ ์ง์‚ฌ๊ฐํ˜•์˜ ์„ธ๋กœ ๊ธธ์ด๊ฐ€ ๋œ๋‹ค.
  8. ์ฒ˜์Œ ์ผ์ •์ด ์žˆ์–ด ์นด์šดํŠธ๋ฅผ ์‹œ์ž‘ํ•œ ๋‚ ์งœ๋ถ€ํ„ฐ ์ผ์ •์ด ์—†์–ด์„œ ๋๋‚œ ๋‚ ์งœ ์ด์ „ ๋‚ ์งœ๊นŒ์ง€ ๊ทธ ๊ตฌ๊ฐ„์˜ ๊ธธ์ด๋ฅผ ๊ตฌํ•œ๋‹ค.
  9. ๋งŒ์•ฝ, ์‹œ์ž‘ ๋‚ ์งœ๊ฐ€ 1์ผ์ด๊ณ  ์ผ์ •์ด ์—†๋Š” ๋‚ ์งœ๊ฐ€ 10์ผ ์ด๋ผ๋ฉด, ์ผ์ •์€ 1์ผ๋ถ€ํ„ฐ 9์ผ์ด๋ฏ€๋กœ, ๊ตฌ๊ฐ„์˜ ๊ธธ์ด๋Š” 9์ด๋‹ค.(9-1+1)
  10. ๊ตฌ๊ฐ„์˜ ๊ธธ์ด๋Š” ์ง์‚ฌ๊ฐํ˜•์˜ ๊ฐ€๋กœ ๊ธธ์ด๊ฐ€ ๋œ๋‹ค.
  11. ๊ฐ€๋กœ์™€ ์„ธ๋กœ ๊ธธ์ด์˜ ๊ณฑ์„ ๊ตฌํ•˜๋ฉด ์ง์‚ฌ๊ฐํ˜• ํฌ๊ธฐ๋ฅผ ๊ตฌํ•  ์ˆ˜ ์žˆ๋‹ค.
  12. ์ด ๊ฐ’์€ ์ฝ”ํŒ…์ง€์˜ ํฌ๊ธฐ๊ฐ€ ๋˜๋ฉฐ ์ด ๊ฐ’์„ ์ƒˆ๋กœ์šด ๋ฐฐ์—ด์— ์ €์žฅํ•œ๋‹ค.
  13. ์ดํ›„, ์•„๊นŒ ๋ฉˆ์ถ”์—ˆ๋˜ 10์ผ์—์„œ ๊ณ„์† ๋ฐ˜๋ณตํ•˜์—ฌ ๋‹ค์‹œ ์ผ์ •์ด ์žˆ๋Š” ๋‚ ์งœ๋ฅผ ์ฐพ๋Š”๋‹ค.
  14. ์ผ์ •์ด ์žˆ๋Š” ๋‚ ์งœ๋ฅผ ์ฐพ์œผ๋ฉด ์ด์ „์ฒ˜๋Ÿผ ๊ณ„์† ๋ฐ˜๋ณตํ•˜์—ฌ ์ผ์ •์ด ์—ฐ์†ํ•˜์—ฌ ์žˆ๋Š” ๋‚ ์งœ๋“ค์˜ ๊ฐ ์ผ์ • ์ˆ˜๋ฅผ ์นด์šดํŠธํ•œ๋‹ค.
  15. 365์ผ๊นŒ์ง€ ์ด ์ผ์„ ๋ฐ˜๋ณตํ•œ๋‹ค.
  16. ์ฝ”ํŒ…์ง€์˜ ํฌ๊ธฐ๋ฅผ ๊ตฌํ•  ๋•Œ๋งˆ๋‹ค ๋ฐฐ์—ด์— ์ €์žฅํ•˜์—ฌ 365์ผ๊นŒ์ง€์˜ ๋ชจ๋“  ๋ฐ˜๋ณต์ด ๋๋‚˜๋ฉด ์ €์žฅํ•ด๋‘” ๋ฐฐ์—ด์˜ ๋ชจ๋“  ๊ฐ’์„ ๋”ํ•œ๋‹ค.
  17. ๊ทธ ๊ฐ’์ด ์ฝ”ํŒ…์ง€ ์ „์ฒด ํฌ๊ธฐ์ด๋‹ค.

์ด ๋…ผ๋ฆฌ์— ๋”ฐ๋ผ ํŒŒ์ด์ฌ์œผ๋กœ ์ฝ”๋“œ๋ฅผ ๊ตฌํ˜„ํ•ด๋ดค์–ด์š”!

n = int(input())  # ์ผ์ •์˜ ๊ฐœ์ˆ˜
calendar = [0] * 365  # 1์ผ ~ 365์ผ

for i in range(n):
    start, end = map(int, input().split()) # ์‹œ์ž‘๋‚ ์งœ, ์ข…๋ฃŒ๋‚ ์งœ

    for day in range(start-1, end):
        calendar[day] += 1 # ์ผ์ • ์ถ”๊ฐ€

# ์ฝ”ํŒ…์ง€ ํฌ๊ธฐ ์ €์žฅํ•  ๋ฆฌ์ŠคํŠธ
coating_papers = []

i = 0
while i < 365:
    if calendar[i] == 0: # ์ผ์ •์ด ์—†๋Š” ๋‚ 
        i+=1
        continue 

    start = i # ์ผ์ •์ด ์žˆ๋Š” ์ฒซ ๋ฒˆ์งธ ๋‚ 
    max_count = 0 # ์ผ์ • ์ˆ˜์˜ ์ตœ๋Œ“๊ฐ’

    while i < 365 and calendar[i] != 0:
        max_count = max(max_count, calendar[i]) # ์ผ์ • ์ˆ˜์˜ ์ตœ๋Œ“๊ฐ’ ๊ตฌํ•˜๊ธฐ
        i += 1

    end = i # ์ผ์ •์ด ์—†๋Š” ๋‚  ๋‚˜์™”์„ ๋•Œ, 
    width = end - start # ๊ฐ€๋กœ ๊ธธ์ด
    height = max_count # ์„ธ๋กœ ๊ธธ์ด(์ผ์ •์ด ๊ฒน์นœ ์ตœ๋Œ€ ์ˆ˜)

    coating_paper = width * height # ์ฝ”ํŒ…์ง€ ํฌ๊ธฐ
    coating_papers.append(coating_paper)

# ๋ชจ๋“  ์ฝ”ํŒ…์ง€ ํฌ๊ธฐ ๋”ํ•˜๊ธฐ
total_coating_papers = sum(coating_papers)

print(total_coating_papers)

16๋ฒˆ์งธ PR ์ˆ˜๊ณ  ๋งŽ์œผ์…จ์–ด์š”!

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