#1716
Calculate Money in Leetcode Bank
newbie · 145 · lc easy +13 · verified · 82.4% accepted · 1,835 likes · top 94%
Description
Hercy deposits money every day. On the first day (Monday) he puts in $1. Each subsequent day in the week he deposits $1 more than the previous day. Each new Monday starts $1 higher than the Monday before.
Given n, return the total saved at the end of day n.
Example 1:
Input: n = 4
Output: 10
Explanation: After the 4th day, the total is 1 + 2 + 3 + 4 = 10.
Example 2:
Input: n = 10
Output: 37
Explanation: After the 10th day, the total is (1 + 2 + 3 + 4 + 5 + 6 + 7) + (2 + 3 + 4) = 37. Notice that on the 2nd Monday, Hercy only puts in $2.
Example 3:
Input: n = 20
Output: 96
Explanation: After the 20th day, the total is (1 + 2 + 3 + 4 + 5 + 6 + 7) + (2 + 3 + 4 + 5 + 6 + 7 + 8) + (3 + 4 + 5 + 6 + 7 + 8) = 96.
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