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George and Accommodation CodeForces - 467A

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. 问题简述：输入要测试多少个数据，然后就给出多少组数据，然后看数据符不符合题目要求 问题分析：…… 程序说明：输入房间数，对每组输入的数据判断，输出符合条件的数据的组数 AC程序代码 #include using namespace std; int main() { int num, a[210],can=0; cin >> num; for (int i = 0;num*2!=i;i += 2) { cin >> a[i] >> a[i + 1]; if (a[i + 1] - a[i] >= 2) can++; } cout << can << endl; }

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