codeforce-467a(乔治与住宿)
题目:
George has recently entered the BSUCP (Berland State University for Cool Programmers). George has a friend Alex who has also entered the university. Now they are moving into a dormitory.
George and Alex want to live in the same room. The dormitory has n rooms in total. At the moment the i-th room has pi people living in it and the room can accommodate qi people in total (pi ≤ qi). Your task is to count how many rooms has free place for both George and Alex.
input:
The first line contains a single integer n (1 ≤ n ≤ 100) — the number of rooms.
The i-th of the next n lines contains two integers pi and qi (0 ≤ pi ≤ qi ≤ 100) — the number of people who already live in the i-th room and the room’s capacity.
output
Print a single integer — the number of rooms where George and Alex can move in.
Examples |
---|
input |
3 |
1 1 |
2 2 |
3 3 |
Output |
0 |
Input |
3 |
1 10 |
0 10 |
10 10 |
Output |
2 |
问题连接:
https://vjudge.net/problem/CodeForces-467A
问题简述:
求出n间宿舍中还能容纳两人的房间。
问题分析:
程序要用到循环和判断语句,并应设置一个计数器记录符合要求的房间。
AC通过的c++程序如下:
#include <iostream>
using namespace std;
int main()
{
int n = 0, p = 0, q = 0, i = 0;
cin >> n;
for (int j = 1; j <= n; j++)
{
cin >> p >> q;
if (p > q || p < 0 || p>100 || q <= 0 || q > 100)
break;
if (q - p >= 2)
{
i++;
}
}
cout << i;
return 0;
}