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🌱 문제번호와 링크
https://www.acmicpc.net/problem/11051
🥺 무엇을 알게 되었나요?
이항계수 nCk = n-1Ck-1 + n-1Ck
점화식으로 하면 d[i][j] = d[i-1][j-1] + d[i-1][j]