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glowing713

Frontend-Deep-Dive

[BOJ] ๋ฐฑ์ค€ 1904 01ํƒ€์ผ / ๋™์  ๊ณ„ํš๋ฒ•(Dynamic-Programming)
Problem_Solving

[BOJ] ๋ฐฑ์ค€ 1904 01ํƒ€์ผ / ๋™์  ๊ณ„ํš๋ฒ•(Dynamic-Programming)

2020. 3. 4. 17:46

์ด๋ฏธ์ง€๋ฅผ ํด๋ฆญํ•˜๋ฉด ๋ฌธ์ œ ์‚ฌ์ดํŠธ๋กœ ์ด๋™ํ•ฉ๋‹ˆ๋‹ค.


 

 

๐Ÿ’ฃ ๋ฌธ์ œ ์ดํ•ด

 

 

์•ž์— ํ’€์—ˆ๋˜ 2193๋ฒˆ ์ด์นœ์ˆ˜ ์™€ ์ƒ๋‹นํžˆ ๋น„์Šทํ•œ ๋ฌธ์ œ์ด๋‹ค.

 

1. 0 ๊ณผ 1 ๋กœ ์ด์ง„์ˆ˜๋ฅผ ๋งŒ๋“ค๊ณ ์ž ํ•œ๋‹ค.

2. 0 ์€ ๋ฌด์กฐ๊ฑด 00 ํ˜•ํƒœ๋กœ๋งŒ ์“ฐ์ด๊ณ  1 ์€ ์›ํ•˜๋Š” ๋Œ€๋กœ ์“ธ ์ˆ˜ ์žˆ๋‹ค.

3. ์ž…๋ ฅ์œผ๋กœ ์ฃผ์–ด์ง„ N ์ž๋ฆฌ ์ˆ˜์˜ ์ด์ง„์ˆ˜๋ฅผ ์ด ๋ช‡ ๊ฐ€์ง€ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š”์ง€ ๊ตฌํ•˜๋ฉด ๋œ๋‹ค.

4. !! ์ฐพ์€ ์ˆ˜์—ด์˜ ๊ฐœ์ˆ˜๋ฅผ 15746 ์œผ๋กœ ๋‚˜๋ˆˆ ๋‚˜๋จธ์ง€๋ฅผ ์ถœ๋ ฅํ•ด์•ผ ํ•œ๋‹ค !!

 

๋™์  ๊ณ„ํš๋ฒ•(Dynamic Programming) ๋ฐฉ์‹์„ ์‚ฌ์šฉํ–ˆ๋‹ค.

 

 

 

๐Ÿ’ญ ํ’€์ด ๊ณผ์ •

 

 

N = 1 ์ธ ๊ฒฝ์šฐ 1 ๋กœ ์ด 1๊ฐ€์ง€

 

N = 2 ์ธ ๊ฒฝ์šฐ 11, 00 ์œผ๋กœ ์ด 2๊ฐ€์ง€

 

N = 3 ์ธ ๊ฒฝ์šฐ 111, 100, 001 ์œผ๋กœ ์ด 3๊ฐ€์ง€

 

N = 4 ์ธ ๊ฒฝ์šฐ 1111, 1001, 1100, 0011, 0000 ์œผ๋กœ ์ด 5๊ฐ€์ง€

 

N = 5 ์ธ ๊ฒฝ์šฐ 11111, 11100, 10011, 11001, 00111, 00100, 10000, 00001 ์œผ๋กœ ์ด 8๊ฐ€์ง€

 

 

๊ฒฝ์šฐ์˜ ์ˆ˜๊ฐ€ ํ”ผ๋ณด๋‚˜์น˜ ์ˆ˜์—ด๋กœ ๋ณ€ํ•˜๋Š” ๊ฒƒ์„ ์ฐพ์„ ์ˆ˜ ์žˆ์—ˆ๋‹ค.

 

 

์ž‘์„ฑ ์–ธ์–ด: C++

 

#include <cstdio>

int dp[1000010] = {0, };

void solve(int num){
    dp[1] = 1;  dp[2] = 2;
    for (int i = 3; i <= num; ++i) {
    	// ๊ฐ’์ด ์ง€๋‚˜์น˜๊ฒŒ ํฐ ๊ฒฝ์šฐ๋ฅผ ๋Œ€๋น„ํ•ด์„œ 15746์œผ๋กœ ๋‚˜๋ˆˆ ๋‚˜๋จธ์ง€๋ฅผ ์ €์žฅ
        dp[i] = ( dp[i-2] + dp[i-1] ) % 15746;
    }
}

int main(){
    int nLength;
    scanf("%d", &nLength);
    solve(nLength);
    printf("%d\n", dp[nLength]);
    return 0;
}

 

 

 

๐Ÿ† ๋ฐฐ์šด ์ 

 

๋ฐ”๋กœ ์•ž์— ํ’€์–ด๋ณธ ๋ฌธ์ œ์™€ ์œ ํ˜•์ด ์œ ์‚ฌํ•ด์„œ ๋ฌด๋‚œํ•˜๊ฒŒ ํ’€์—ˆ๋˜ ๋ฌธ์ œ์ด๋‹ค.

์ €์ž‘์žํ‘œ์‹œ ๋น„์˜๋ฆฌ ๋ณ€๊ฒฝ๊ธˆ์ง€ (์ƒˆ์ฐฝ์—ด๋ฆผ)

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