Cow Frisbee

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문제

Farmer John's NN cows (N3×105)N \leq 3 \times 10^5) have heights 1,2,,N1, 2, \ldots, N. One day, the cows are standing in a line in some order playing frisbee; let h_1h_Nh\_1 \ldots h\_N denote the heights of the cows in this order (so the hh's are a permutation of 1N1 \ldots N).

Two cows at positions ii and jj in the line can successfully throw the frisbee back and forth if and only if every cow between them has height lower than min(h_i,h_j)\min(h\_i, h\_j).

Please compute the sum of distances between all pairs of locations i\<ji\<j at which there resides a pair of cows that can successfully throw the frisbee back and forth. The distance between locations ii and jj is ji+1j-i+1.

입력

The first line of input contains a single integer NN. The next line of input contains h_1h_Nh\_1 \ldots h\_N, separated by spaces.

출력

Output the sum of distances of all pairs of locations at which there are cows that can throw the frisbee back and forth. Note that the large size of integers involved in this problem may require the use of 64-bit integer data types (e.g., a "long long" in C/C++).

힌트

The pairs of successful locations in this example are as follows:

(1, 2), (1, 5), (2, 3), (2, 4), (2, 5), (3, 4), (4, 5), (5, 6), (6, 7)