![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
分析下面语句段执行的时间复杂度。 (1) for (i = 1; i <= n ; i ++) for (j = 1; j <= n ; j ++) s ++; (2) for (i = 1; i <= n ; i ++) for (j = i; j <= n ; j ++) s ++; (3) for (i = 1; i <= n ; i ++) for (j = 1; j <= i; j ++) s ++; (4) i = 1; k = 0; while (i <= n - 1) { k += 10 * i; i ++; }