需求
表: NPV
---------------------- | Column Name | Type | ---------------------- | id | int | | year | int | | npv | int | ---------------------- (id, year) 是该表主键. 该表有每一笔存货的年份, id 和对应净现值的信息.
表: Queries
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题目: 题解:
int calculate(char* s) {int n strlen(s);int stk[n], top 0;char preSign ;int num 0;for (int i 0; i < n; i) {if (isdigit(s[i])) {num num * 10 (int)(s[i] - 0);}if (!isdigit(s[i]) && s[i] ! || i n - 1) {s…