poj 2363 Blocks(暴力)

题目链接：http://poj.org/problem?id=2363

思路分析：由于数据较小，采用暴力搜索法。假设对于矩形边长 1 <= a <= b <= c <= N; 由于 c = N / (a * b),  c必须满足条件:为整数且不小于b。

代码如下： 

#include <iostream>
using namespace std;

int main()
{
    int n, min_area;
    double a, b, c, volume;

    cin >> n;

    for ( int i = 0; i < n; ++i )
    {
        cin >> volume;

        min_area = INT_MAX;
        for ( a = 1; a <= volume; ++a )
        {
            for ( b = a; b <= volume; ++b )
            {
                c = (double)volume / (a*b);

                if ( c < b )
                    break;
                else
                if ( c - int(c) == 0.0 )
                {
                    int area = ( a*b + a*c + b*c ) * 2;

                    if ( area < min_area )
                        min_area = area;
                }
            }
        }

        cout << min_area << endl;
    }
}