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๋‹ค์ต์ŠคํŠธ๋ผ ์•Œ๊ณ ๋ฆฌ์ฆ˜(Dijkstra's algorithm)

๋‹ค์ต์ŠคํŠธ๋ผ ์•Œ๊ณ ๋ฆฌ์ฆ˜์€ ๋„๋กœ ๋„คํŠธ์›Œํฌ ๋“ฑ์„ ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋Š” ๊ทธ๋ž˜ํ”„์—์„œ ๋…ธ๋“œ ๊ฐ„์˜ ์ตœ๋‹จ ๊ฒฝ๋กœ๋ฅผ ์ฐพ๋Š” ์•Œ๊ณ ๋ฆฌ์ฆ˜์ž…๋‹ˆ๋‹ค.

์ด ์•Œ๊ณ ๋ฆฌ์ฆ˜์€ ๋‹ค์–‘ํ•œ ํ˜•ํƒœ๋กœ ์กด์žฌํ•ฉ๋‹ˆ๋‹ค. ๋‹ค์ต์ŠคํŠธ๋ผ์˜ ์›๋ž˜ ํ˜•ํƒœ๋Š” ๋‘ ๋…ธ๋“œ ๊ฐ„์˜ ์ตœ๋‹จ ๊ฒฝ๋กœ๋ฅผ ์ฐพ์•˜์ง€๋งŒ, ๋” ์ผ๋ฐ˜์ ์ธ ํ˜•ํƒœ๋Š” ๋‹จ์ผ ๋…ธ๋“œ๋ฅผ "์†Œ์Šค"๋…ธ๋“œ๋กœ ์ˆ˜์ •ํ•˜๊ณ  ๊ทธ๋ž˜ํ”„์˜ ์†Œ์Šค์—์„œ ๋‹ค๋ฅธ ๋ชจ๋“  ๋…ธ๋“œ๊นŒ์ง€์˜ ์ตœ๋‹จ ๊ฒฝ๋กœ๋ฅผ ์ฐพ์•„ ์ตœ๋‹จ ๊ฒฝ๋กœ ํŠธ๋ฆฌ(shortest-path tree)๋ฅผ ์ƒ์„ฑํ•ฉ๋‹ˆ๋‹ค.

Dijkstra

a์™€ b ์‚ฌ์ด์˜ ์ตœ๋‹จ ๊ฒฝ๋กœ๋ฅผ ์ฐพ๋Š” ๋‹ค์ต์ŠคํŠธ๋ผ ์•Œ๊ณ ๋ฆฌ์ฆ˜์ž…๋‹ˆ๋‹ค. ๊ฐ€์žฅ ๋‚ฎ์€ ๊ฑฐ๋ฆฌ๋ฅผ ๊ฐ€์ง€๋ฉฐ ๋ฐฉ๋ฌธํ•˜์ง€ ์•Š์€ ์ •์ (vertex)๋ฅผ ์„ ํƒํ•˜๊ณ , ์ด๋ฅผ ํ†ตํ•ด ๋ฐฉ๋ฌธํ•˜์ง€ ์•Š์€ ๊ฐ ์ด์›ƒ๊นŒ์ง€์˜ ๊ฑฐ๋ฆฌ๋ฅผ ๊ณ„์‚ฐํ•˜๋ฉฐ, ๋” ์ž‘์€ ๊ฒฝ์šฐ ์ด์›ƒ์˜ ๊ฑฐ๋ฆฌ๋ฅผ ์—…๋ฐ์ดํŠธํ•ฉ๋‹ˆ๋‹ค. ์ด์›ƒ์— ๋Œ€ํ•œ ์ž‘์—…์„ ๋งˆ์น˜๋ฉด ๋ฐฉ๋ฌธํ•œ ๊ฒƒ์œผ๋กœ ํ‘œ์‹œ(๋นจ๊ฐ„์ƒ‰์œผ๋กœ ๋ณ€๊ฒฝ)ํ•ฉ๋‹ˆ๋‹ค.

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