以下代码的功能是什么？ - 1])
def knapsack(weights, values, capacity):
n = len(weights)
dp = [[0] * (capacity + 1) for _ in range(n + 1)]
for i in range(1, n + 1):
for j in range(1, capacity + 1):
if weights[i - 1] <= j:
dp[i][j] = max(dp[i - 1][j], dp[i - 1][j - weights[i - 1]] + values[i - 1])
else:
dp[i][j] = dp[i - 1][j]
return dp[n][capacity]
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