Codeforces Round #398 (Div. 2) -- B. The Queue （贪心+暴力）

大体题意：

告诉你工作站的工作起始时间 终止时间， 和处理一个人的时间间隔。

并告诉你n 个人来的时间。 求你要求的话 什么时候去 排队时间最少， 如果你和某个人去的时间一样，你会排在它们后面。

思路：

暴力贪心就好了。

先找有缝的，发现一个人的就诊时间大于上一个人结束时间，那么直接输出 上一个人输出时间。

以上找的是不用排队的时间。

如果找不到，就要找需要排队的时间。

直接枚举每个人来的时间，看看在这个人前面行不行，更新最小排队时间即可。

#include <bits/stdc++.h>#define mr make_pair#define ps push_back#define fi first#define se second#define Siz(x) (int)x.size()using namespace std;typedef long long LL;typedef unsigned long long ULL;const double eps = 1e-10;const int inf = 0x3f3f3f3f;const double pi = acos(-1.0);const int maxn = 100000 + 10;int n;LL s,t,k,st[maxn],ed[maxn];LL a[maxn];int main(){    scanf("%lld %lld %lld",&s, &t, &k);    scanf("%d",&n);    if (n == 0) return 0 * printf("%lld\n",s); ///= =  好坑啊，n 能等于0    for (int i = 0; i < n; ++i){        scanf("%lld",a+i); ///每个人来的时间    }        if (a[0] > s){        return 0 * printf("%lld\n",s);    }    memset(st,inf,sizeof st);    memset(ed,inf,sizeof ed);    LL la = -1;    LL ans = -1;    la = s+k;    st[0] = s; ///每个人的开始就诊时间    ed[0] = s+k;/// 每个人结束就诊时间。    for (int i = 1; i < n; ++i){//        printf("la = %lld",la);        if (la >= t) break;        if (a[i] > la){            if (la+k<=t) return 0 * printf("%lld\n",la);            la = a[i]+k;            st[i] = a[i];            ed[i] = a[i]+k;            continue;        }        if (la+k > t)break;        st[i] = la;        ed[i] = la+k;        la += k;    }    if (la < t && la+k<=t) return 0 * printf("%lld\n",la);///=====================///以下找需要排队的时间    ans = 1e18;    LL pos = 0;    for (int i = 0; i < n; ++i){        if (st[i] == inf || ed[i] == inf)break;        if (i == 0){            if (a[0] - 1 >= 0){                if (ans > st[0] - (a[0]-1) ){                    ans = st[0] - (a[0]-1);                    pos = a[0] - 1;                }            }        }        else {            if (ans > st[i] - (a[i]-1)){                ans = st[i] - (a[i] - 1);                pos = a[i]-1;            }        }    }    printf("%lld\n",pos);    return 0;}/**7 14 321 230 60 3101 5 6 10 12 13 18 23 24 25**/

B. The Queue

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Finally! Vasya have come of age and that means he can finally get a passport! To do it, he needs to visit the passport office, but it's not that simple. There's only one receptionist at the passport office and people can queue up long before it actually opens. Vasya wants to visit the passport office tomorrow.

He knows that the receptionist starts working after ts minutes have passed after midnight and closes after tf minutes have passed after midnight (so that (tf - 1) is the last minute when the receptionist is still working). The receptionist spends exactly t minutes on each person in the queue. If the receptionist would stop working within t minutes, he stops serving visitors (other than the one he already serves).

Vasya also knows that exactly n visitors would come tomorrow. For each visitor Vasya knows the point of time when he would come to the passport office. Each visitor queues up and doesn't leave until he was served. If the receptionist is free when a visitor comes (in particular, if the previous visitor was just served and the queue is empty), the receptionist begins to serve the newcomer immediately.

"Reception 1"

For each visitor, the point of time when he would come to the passport office is positive. Vasya can come to the office at the time zero (that is, at midnight) if he needs so, but he can come to the office only at integer points of time. If Vasya arrives at the passport office at the same time with several other visitors, he yields to them and stand in the queue after the last of them.

Vasya wants to come at such point of time that he will be served by the receptionist, and he would spend the minimum possible time in the queue. Help him!

Input

The first line contains three integers: the point of time when the receptionist begins to work ts, the point of time when the receptionist stops working tf and the time the receptionist spends on each visitor t. The second line contains one integer n — the amount of visitors (0 ≤ n ≤ 100 000). The third line contains positive integers in non-decreasing order — the points of time when the visitors arrive to the passport office.

All times are set in minutes and do not exceed 1012; it is guaranteed that ts < tf. It is also guaranteed that Vasya can arrive at the passport office at such a point of time that he would be served by the receptionist.

Output

Print single non-negative integer — the point of time when Vasya should arrive at the passport office. If Vasya arrives at the passport office at the same time with several other visitors, he yields to them and queues up the last. If there are many answers, you can print any of them.

Examples

input

10 15 2210 13

output

12

input

8 17 343 4 5 8

output

2

Note

In the first example the first visitor comes exactly at the point of time when the receptionist begins to work, and he is served for two minutes. At 12 minutes after the midnight the receptionist stops serving the first visitor, and if Vasya arrives at this moment, he will be served immediately, because the next visitor would only come at 13 minutes after midnight.

In the second example, Vasya has to come before anyone else to be served.