4819: P1216 [USACO1.5] [IOI1994]数字三角形 Number Triangles(普及-)
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:3
Solved:2
Description

Input

Output

Sample Input Copy
5
7
3 8
8 1 0
2 7 4 4
4 5 2 6 5
Sample Output Copy
30
HINT
