[js][填坑] 计算数字数组中的最大值序列

#

            var maxSequence = function(arr) {
                console.info(arr);
                var min = 0,
                    ans = 0,
                    i, sum = 0;
                for (i = 0; i < arr.length; ++i) {
                    sum += arr[i];
                    min = Math.min(sum, min);
                    ans = Math.max(ans, sum - min);
                    console.warn(sum, min, ans);
                }
                return ans;
            }

#

            var maxSequence = function(arr) {
                if (arr.length == 0) {
                    return 0;
                }
                var isPositive = true;
                var isNegative = true;
                var count = 0;
                for (var i = 0; i < arr.length; i++) {
                    if (arr[i] >= 0) {
                        count += arr[i];
                        isNegative = false;
                    } else {
                        isPositive = false;
                    }
                }
                if (isNegative) {
                    return count;
                }
                if (isPositive) {
                    return count;
                }
                var max = 0;
                for (var i = 0; i < arr.length; i++) {
                    var temp = arr[i];
                    if (max < temp) {
                        max = temp;
                    }
                    for (var j = i + 1; j < arr.length; j++) {
                        temp += arr[j];
                        if (max < temp) {
                            max = temp;
                        }
                    }
                }
                return max;
            }

#test

            console.warn(maxSequence([]));
            console.warn(maxSequence([-2, -1, -3, -4, -1, -2, -1, -5, -4]));
            console.warn(maxSequence([2, 1, 3, 4, 1, 2, 1, 5, 4]));
            console.warn(maxSequence([-2, 1, -3, 4, -1, 2, 1, -5, 4]));