関連ワード:  longest subarray with given sum k(positives)    longest subarray with given sum k    longest subarray with given sum    longest subarray with given sum k(positives) leetcode    longest subarray with given sum k(positives) gfg    longest subarray with given sum k(positives) gfg practice    longest subarray with given sum k(positives) practice    longest subarray with given sum k leetcode    longest subarray with given sum leetcode    longest subarray with given sum k positives and negatives