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传送门
题意: 找到目标数组a中的1 <= i < j < k <= n满足a[j] > a[i] 且 a[j] > a[k],并输出"YES"与合格索引,反之直接输出"NO"。
思路:
- 其实这个不难想到主要有满足a[j] > a[i]且a[j] > a[k];那么我们为何不把i,j,k无限逼近呢?
- 即若有合格的a[j],那么必定可以找到i,j,k三个数相邻的情况。
代码实现:
#include<bits/stdc++.h>
#define endl '\n'
#define null NULL
#define ll long long
#define int long long
#define pii pair<int, int>
#define lowbit(x) (x &(-x))
#define ls(x) x<<1
#define rs(x) (x<<1+1)
#define me(ar) memset(ar, 0, sizeof ar)
#define mem(ar,num) memset(ar, num, sizeof ar)
#define rp(i, n) for(int i = 0, i < n; i ++)
#define rep(i, a, n) for(int i = a; i <= n; i ++)
#define pre(i, n, a) for(int i = n; i >= a; i --)
#define IOS ios::sync_with_stdio(0); cin.tie(0);cout.tie(0);
const int way[4][2] = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
using namespace std;
const int inf = 0x7fffffff;
const double PI = acos(-1.0);
const double eps = 1e-6;
const ll mod = 1e9 + 7;
const int N = 2e5 + 5;int t, n, a[N];signed main()
{IOS;cin >> t;while(t --){cin >> n;for(int i = 1; i <= n; i ++)cin >> a[i];int ok = 1;for(int i = 2; i < n; i ++){if(a[i] > a[i - 1] && a[i] > a[i + 1]){ok = 0;cout << "YES" << endl;cout << i - 1 << " " << i << " " << i + 1 << endl;break;}}if(ok) cout << "NO" << endl;else continue;}return 0;
}
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