题目
4
+---+
| |
| |
| | 3 3
| +---+ +---+
| | | |
| | | |
2 | | 2 | | 2
+---+ | +---+ | +---+
| | | | | |
| | | | | |
1 | | 1 1 | | 1 | | 1
+---+ +---+ +---+ +---+ +---+
| | | |
| | | |
0 | | 0 0 | | 0
+---+ +---+---+ +---+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
登山者想要知道一张地图中有多少座山峰