A. Rounding
time limit per test
memory limit per test
input
output
n. He wants to round it to nearest integer, which ends up with 0. If n already ends up with 0, Vasya considers it already rounded.
n = 4722 answer is 4720. If n = 5 Vasya can round it to 0 or to 10. Both ways are correct.
n
Input
n (0 ≤ n ≤ 109) — number that Vasya has.
Output
n. Pay attention that in some cases answer isn't unique. In that case print any correct answer.
Examples
input
5
output
0
input
113
output
110
input
1000000000
output
1000000000
input
5432359
output
5432360
Note
n = 5. Nearest integers, that ends up with zero are 0 and 10. Any of these answers is correct, so you can print 0 or10.
题解:四舍五入，直接求解。
Code：
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
scanf("%d",&n);
int k=n%10;
if(k<=5)printf("%d",n-k);
else printf("%d",n+10-k);
return 0;
}