Problem-467A-Codeforces-George and Accommodation
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A. George and Accommodation
time limit per test1 second
memory limit per test256 megabytes
inputstandard input
outputstandard outputGeorge 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
#include<stdio.h>int main(){ int n; scanf("%d",&n); int people[n][2]; int count=0; for(int i=0;i<n;i++) { for(int j=0;j<2;j++){ scanf("%d",&people[i][j]); } if(people[i][1]-people[i][0]>=2) count++; } printf("%d\n",count);}
#include <stdio.h>int main(){ int n,a,b,count=0; scanf("%d",&n); while(n--){ scanf("%d%d",&a,&b); if(b-a>=2)count++; } printf("%d\n",count);}
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