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23 lines
522 B
23 lines
522 B
#include <bits/stdc++.h>
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using namespace std;
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int n, a[1000086], ans;
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int main() {
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cin >> n;
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a[0] = -1;
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a[n + 1] = -1;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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if (a[i] == a[i - 1]) {
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i--;
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n--;
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}//没错这是去重。如果重复了，总个数直接减。
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}
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for (int i = 3; i <= n - 2; i++)//第1、2和倒数第1、2个绝对不是低洼地。
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{
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if (a[i] < a[i - 1] && a[i] < a[i + 1])ans++;
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}
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cout << ans;
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return 0;
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} |