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Solution.cs

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public class Solution

{

public int MinimumSumSubarray(IList<int> nums, int l, int r)

{

int n = nums.Count;

int[] prefixSum = new int[nums.Count + 1];

for (int i = 0; i < n; i++)

{

prefixSum[i + 1] = prefixSum[i] + nums[i];

}

int ans = int.MaxValue;

for (int i = l; i <= n; i++)

{

for (int j = l; j <= r && i - j >= 0; j++)

{

int c = prefixSum[i] - prefixSum[i - j];

if (c > 0)

{

if (ans > c)

{

ans = c;

}

}

}

}

return ans == int.MaxValue ? -1 : ans;

}

}