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27 lines
691 B
27 lines
691 B
6 months ago
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# work12
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# 有一个由数字1，2，…，9组成的数字串，长度不超过200，
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# 问如何将M（1≤M≤20）个加号插入这个数字串中，使得所形成的算法表达式的值最小。
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def get_num(nums: list[int]) -> int:
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result = 0
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for num in list:
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result = result*10 + num
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return result
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dp = []
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def solve(nums: list, p: int, x: int) -> int:
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if dp[p][x] != -1:
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return dp[p][x]
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if x == 0:
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dp[p][0] = get_num(nums[0,p])
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return dp[p][0]
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for i in range(x, p-1, -1):
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dp[p][x] = min(dp[p][x], solve(i, x-1)+get_num(nums[i:p]))
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return dp[p][x]
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result = solve([7,9,8,4,6], 5, 20)
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print(result)
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