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poj 2528 Mayor's posters

题目大意:求最终有多少张海报可见。

题目思路:最近想写一下矩形切割,当然,对于这道题不是很适合,不过可以过。

[cpp] 
#include<stdio.h> 
#include<stdlib.h> 
#include<string.h> 
#include<string> 
#include<queue> 
#include<algorithm> 
#include<vector> 
#include<stack> 
#include<list> 
#include<iostream> 
#include<map> 
#include<math.h> 
using namespace std; 
#define inf 0x3f3f3f3f 
#define uint unsigned __int64 
#define M 1000000 
struct node 

        int p1,p2,co; 
}a[M],now; 
int used[10100],total; 
int judge(node a,node b) 

        if(a.p2<b.p1||a.p1>b.p2) 
                return 0; 
        else return 1; 

void cut(node tmp) 

        int k1,k2; 
        k1=max(tmp.p1,now.p1); 
        k2=min(tmp.p2,now.p2); 
        if(tmp.p1<k1) 
        { 
                a[++total]=tmp; 
                a[total].p2=k1-1; 
        } 
        if(tmp.p2>k2) 
        { 
                a[++total]=tmp; 
                a[total].p1=k2+1; 
        } 

int main() 

        int t,i,j,l,r,n; 
        scanf("%d",&t); 
        while(t--) 
        { 
                scanf("%d",&n); 
                total=0; 
                for(i=1;i<=n;i++) 
                { 
                        scanf("%d%d",&l,&r); 
                        now.p1=l;now.p2=r;now.co=i; 
                        for(j=total;j>=1;j--) 
                        { 
                                if(judge(now,a[j])) 
                                { 
                                        cut(a[j]); 
                                        a[j]=a[total--]; 
                                } 
                        } 
                        a[++total]=now; 
                } 
                memset(used,0,sizeof(used)); 
                int num=0; 
                for(i=1;i<=total;i++) 
                { 
                        if(!used[a[i].co]) 
                        { 
                                used[a[i].co]=1; 
                                num++; 
                        } 
                } 
                printf("%d\n",num); 
        } 


 

补充:软件开发 , C++ ,
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