标签：blog io os ar for 2014 div sp cti
Over time, Alexey‘s mail box got littered with too many letters. Some of them are read, while others are unread.
Alexey‘s mail program can either show a list of all letters or show the content of a single letter. As soon as the program shows the content of an unread letter, it becomes read letter (if the program shows the content of a read letter nothing happens). In one click he can do any of the following operations:
The program cannot delete the letters from the list or rearrange them.
Alexey wants to read all the unread letters and go watch football. Now he is viewing the list of all letters and for each letter he can see if it is read or unread. What minimum number of operations does Alexey need to perform to read all unread letters?
The first line contains a single integer n (1?≤?n?≤?1000) — the number of letters in the mailbox.
The second line contains n space-separated integers (zeros and ones) — the state of the letter list. The i-th number equals either 1, if the i-th number is unread, or 0, if the i-th letter is read.
Print a single number — the minimum number of operations needed to make all the letters read.
5 0 1 0 1 0
3
5 1 1 0 0 1
4
2 0 0
0 题意：查看邮件，求需要操作的次数 思路：题意题，模拟#include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; int main() { int n, num[1010]; scanf("%d", &n); for (int i = 1; i <= n; i++) scanf("%d", &num[i]); int ans = 0; for (int i = 0; i < n; i++) if (num[i] && num[i+1]) ans++; else if (num[i] && !num[i+1]) ans += 2; if (!num[n] && ans) ans--; else if (num[n]) ans++; printf("%d\n", ans); return 0; }
Codeforces Round #265 (Div. 2) B. Inbox (100500)
标签：blog io os ar for 2014 div sp cti
原文地址：http://blog.csdn.net/u011345136/article/details/39342481
