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// 1716. Calculate Money in Leetcode Bank
#include "leetcode.h"
/*
* hercy wants to save money for his first car. he puts money in the leetcode
* bank every day. he starts by putting in $1 on monday, the first day. every
* day from tuesday to sunday he will put in 1 more dollar than the day before.
* on every subsequent monday, he will put in 1 more than the previous monday.
* given 'n', return the total amount of money he will have in the leetcode bank
* at the end of the n'th day.
*/
int totalMoney(int n) {
int begin = 1, end = 7;
int sum = 28, total = 0;
while (n - 7) {
total += sum;
sum -= begin++;
sum += ++end;
n -= 7;
}
for (int i = 0; i < n; ++i) {
total += begin;
++begin;
}
return total;
}
int main() {
printf("%d\n", totalMoney(4)); // expect: 10
printf("%d\n", totalMoney(10)); // expect: 37
printf("%d\n", totalMoney(20)); // expect: 96
}
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