SCU 4440 分类： ACM 2015-06-20 23:58 16人阅读 评论(0) 收藏

SCU - 4440

Rectangle

Time Limit: Unknown

Memory Limit: Unknown

64bit IO Format: %lld & %llu

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Status

Description

Rectangle

frog has a piece of paper divided into n rows and m columns. Today, she would like to draw a rectangle whose perimeter is not greater than k .

There are 8 (out of 9 ) ways when n = m = 2 , k = 6

Find the number of ways of drawing.

Input

The input consists of multiple tests. For each test:

The first line contains 3 integer n , m , k ( 1 ≤ n , m ≤ 5 ⋅ 10 4 , 0 ≤ k ≤ 10 9 ).

Output

For each test, write 1 integer which denotes the number of ways of drawing.

Sample Input

 2 2 6
    1 1 0
    50000 50000 1000000000

Sample Output

 8
    0
    1562562500625000000

#include<queue>
#include<math.h>
#include<stdio.h>
#include<string.h>
#include<iostream>
#include<algorithm>
using namespace std;
#define N 115

long long n,m,k,sum;

int main()
{
    while(~scanf("%lld%lld%lld",&n,&m,&k))
    {

        sum=0;
        for(long long i=1;k-2*i>=2&&i<=n;i++)
        {
            long long mi=min((k-2*i)/2,m);
            long long x=n-i+1,y=m+1;
            sum+=x*(mi*y-(1+mi)*mi/2);
        }
        printf("%lld\n",sum);
    }

    return 0;
}

//freopen("1.txt", "r", stdin);
    //freopen("2.txt", "w", stdout);
//**************************************

省赛中的一题，暴力枚举，没想出来真是不应该，想出来就铜牌了

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