[dp/백준] 2225번: 합분해

-문제: https://www.acmicpc.net/problem/2225

 

아직 풀이가 잘 이해가지 않는다!

 

-정답풀이:

n,k=map(int,input().split())
dp=[[0]*201 for _ in range(201)]

for i in range(201):
    dp[1][i]=1
    dp[2][i]=i+1
    
for i in range(2,201):
    dp[i][1]=i
    for j in range(2,201):
        dp[i][j]=(dp[i][j-1]+dp[i-1][j])%10**9
print(dp[k][n])