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2 years ago
#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
int a[N];
int n;
//最大值
int cnt;
//路径
vector<int> path;
/**
3
130 200 55
2
*/
/**
*
* @param step
*/
void dfs(int step) {
//如果越界
if (step == n + 1) {
//更新最大长度
cnt = max(cnt, (int) path.size());
return;
}
//如果选择了当前篮筐
//是不是可以选择这个位置
if (path.empty() || a[step] < a[path.back()]) {
path.push_back(step);//选择了第几个篮筐
dfs(step + 1);
path.pop_back();//回溯
}
//不选择当前篮筐
dfs(step + 1);
}
int main() {
//输入
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
//深度优先
dfs(1);
//输出最大值
cout << cnt << endl;
return 0;
}