2017Nowcoder Girl初赛重现赛 A 平方数

题目链接

#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<string.h>
#include<queue>
#include<stack>
#include<list>
#include<map>
#include<set>
#include<vector>
using namespace std;
typedef long long int ll;
const int maxn =100+5;
const int maxm=10000;
const int mod =1e9+7;
const int INF=0x3f3f3f3f;
const double eps=1e-8;
 
int main()
{
    int n;scanf("%d",&n);
    int ans=-1;
    for(int i=1;i<=sqrt(n);i++)
        ans=max(ans,i*i);
    printf("%d\n",ans);
    return 0;
}