Codeforces Round #441 (Div. 2, by Moscow Team Olympiad) D. Sorting the Coins【规律】

题目比较难读懂，读懂之后就好写了，看一下第二组样例就可以找到规律。

/* ***********************************************
Author        :xiang578
Email         :[email protected]
Created Time  :Wed Nov  8 15:53:46 2017
File Name     :cf876d.cpp
************************************************ */

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

int n,p,t,a[312345];
long long cnt,ans;
vector<int>v;

int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    cin>>n;
    cnt=1;
    p=n;
    v.push_back(cnt);
    for(int i=0;icin>>t;
        a[t]=1;
        cnt++;
        while(a[p]) {p--;cnt--;}
        v.push_back(cnt);
    }
    for(int i=0;icout<" ";
    return 0;
}