Black and white painting
题目描述
You are visiting the Centre Pompidou which contains a lot of modern paintings. In particular you notice one painting which consists solely of black and white squares, arranged in rows and columns like in a chess board (no two adjacent squares have the same colour). By the way, the artist did not use the tool of problem A to create the painting.
Since you are bored, you wonder how many 8 × 8 chess boards are embedded within this painting. The bottom right corner of a chess board must always be white.
输入
The input contains several test cases. Each test case consists of one line with three integers n, m and c. (8 ≤ n, m ≤ 40000), where n is the number of rows of the painting, and m is the number of columns of the painting. c is always 0 or 1, where 0 indicates that the bottom right corner of the painting is black, and 1 indicates that this corner is white.
The last test case is followed by a line containing three zeros.
输出
For each test case, print the number of chess boards embedded within the given painting.
示例输入
8 8 0 8 8 1 9 9 1 40000 39999 0 0 0 0
示例输出
0 1 2 799700028
代码：
#include <iostream>
#include <string>
#include <algorithm>
#include <stdio.h>
#include <string.h>
using namespace std;
int main()
{
int n, m, c;
long long int ans=0;
int i, j;
while(scanf("%d %d %d", &n, &m, &c)!=EOF)
{
if(n==0 && m==0 &&c==0 )
break;
ans=0;
int flag;
if(c==1) // bai
flag=1;
else
flag=0;
int dd, ff;
for(i=m; i>=8; i--)
{
if(flag==1)
{
dd=(n-8)/2+1;
ans+=dd; flag=0;
}
else
{
ff=n-1;
if(ff<8)
{
dd=0;
ans+=dd;
flag=1;
}
else
{
dd=(ff-8)/2+1;
ans+=dd; flag=1;
}
}
}
printf("%lld
", ans );
}
return 0;
}