Codeforces_451_B

http://codeforces.com/problemset/problem/451/B

取前后第一个不满足条件的位置，逆序，判断。

#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
    int n,a[],left = ,right = ;
    cin >> n;
    for(int i = ;i <= n;i++)
    {
        cin >> a[i];
    }
    for(int i = ;i <= n-;i++)
    {
        if(a[i] > a[i+])
        {
            left = i;
            break;
        }
    }
    for(int i = n;i > ;i--)
    {
        if(a[i] < a[i-])
        {
            right = i;
            break;
        }
    }
    reverse(a+left,a+right+);
    int flag = ;
    for(int i = ;i <= n-;i++)
    {
        if(a[i] > a[i+])
        {
            flag = ;
            break;
        }
    }
    if(flag)
    {
        printf("yes\n");
        printf("%d %d\n",left,right);
    }
    else
    {
        printf("no\n");
    }
    return ;
}