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uva_297-Quadtrees

[cpp] 
/**总共是1024像素,递归建立4叉树,然后统计黑格子数量即可
 *解决,我这里是模拟建立4叉树,能达到同样的效果,而且能
 *节省一点时间和空间
 */  www.zzzyk.com
#include <cstdio> 
#include <cstring> 
#include <cctype> 
using namespace std; 
 
#define MAX 1024 
#define POS 4 
 
bool a[MAX+2]; 
 
void pre_create_tree(int l, int r, int n){ 
    char c; 
    while(scanf("%c", &c), isspace(c)); 
    if( c == 'p' ){ 
        for(int i = 0; i < POS; i ++){ 
            if( i ) l += n/POS; 
            pre_create_tree(l, l+n/POS-1, n/POS); 
        } 
    }else if( c == 'f' ){ 
        for(int i = l; i <= r; i ++) a[i] = true; 
    }else return ; 

 
int main(int argc, char const *argv[]) 

#ifndef ONLINE_JUDGE 
        freopen("test.in", "r", stdin); 
#endif 
    int cas, sum; 
    scanf("%d", &cas); 
    while( cas-- ){ 
        sum = 0; 
        for(int i = 1; i <= MAX; i ++) { a[i] = false;} 
        pre_create_tree(1, 1024, 1024); 
        pre_create_tree(1, 1024, 1024); 
        for(int i = 1; i <= MAX; i ++) 
            if( a[i] ) sum ++; 
        printf("There are %d black pixels.\n", sum); 
    } 
    return 0; 

补充:软件开发 , Java ,
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