HDU 6154 CaoHaha's staff 思维 找规律

#include <iostream>
#include <cstdio>
#include <string>
#include <vector>
#include <cstring>
#include <iterator>
#include <cmath>
#include <algorithm>
#include <stack>
#include <deque>
#include <map>
#define lson l, m, rt<<1
#define rson m+1, r, rt<<1|1
#define mem0(a) memset(a,0,sizeof(a))
#define meminf(a) memset(a,0x3f,sizeof(a))
#define fi(n) for(i=0;i<n;i++)
#define fj(m) for(j=0;j<m;j++)
#define sca(x) scanf("%d",&x)
#define scalld(x) scanf("%I64d",&x)
#define print(x) printf("%d\n",x)
#define printlld(x) printf("%I64d\n",x)
#define d printf("=======\n")

using namespace std;
const int maxn = 1e5;
const int INF = 0x3fffffff;

int main() {
    double n;
    double s;
    int t;
    cin >> t;
    while( t-- ) {
        cin >> s;
        if( s == 1 || s == 2 ) {
            cout << "4" << endl;
            continue;
        }
        if( s == 3 || s == 4 ) {
            cout << "6" << endl;
            continue;
        }
        if( s == 5 ) { cout << "7" << endl; continue;}
        if( s == 6 || s == 7 || s == 8 ) {
            cout << "8" << endl;
            continue;
        }
        for( n = 1; n <= maxn; n++ ) {
            if( 2 * n * n <= s && s <= 2 * (n+1) * (n+1) ) break;
        }
//        cout << n << " " << n+1 << endl;
    
        n++;
        double area = 2*(n)*(n);
        double d1 = n+0.5;
        double d2 = 2*n;
        double d3 = 3*n+0.5;
//        cout << area << endl;
//        cout << area - d3 << endl;
//        cout << area - d2 << endl;
//        cout << area - d1 << endl;
        if( s <= area - d3 ) {
            cout << 4 * n - 3 << endl;
            continue;
        }
        if( s <= area - d2 ) {
            cout << 4 * n - 2 << endl;
            continue;
        }
        if( s <= area - d1 ) {
            cout << 4 * n - 1 << endl;
            continue;
        }
        cout << 4 * n << endl;
    }
    return 0;
}