time limit per test
0.5 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can say that there are no less thana people
standing in front of him and no more than b people standing behind him. Find the number of different positions Petr can occupy.
Input
The only line contains three integers n, a and b (0 ≤ a, b < n ≤ 100).
Output
Print the single number — the number of the sought positions.
Sample test(s)
input
3 1 1
output
2
input
5 2 3
output
3
Note
The possible positions in the first sample are: 2 and 3 (if we number the positions starting with 1).
In the second sample they are 3, 4 and 5.
解题说明:这道题就是考虑前a个不能站人,同时要考虑后面的人不能超过b个,分情况判断即可,当总人数过多或a太小时,以b为准,否则就以a为准
#include <iostream> #include<cstdio> #include<cstring> #include<cmath> using namespace std; int main() { int n,a,b; int temp1; int answer; scanf("%d %d %d",&n,&a,&b); temp1=n-a; if(temp1-1>b) { answer=b+1; } else { answer=temp1; } printf("%d\n",answer); return 0; }