{"id":206,"date":"2010-04-03T13:51:00","date_gmt":"2010-04-03T05:51:00","guid":{"rendered":"http:\/\/localhost\/?p=206"},"modified":"2010-04-03T13:51:00","modified_gmt":"2010-04-03T05:51:00","slug":"scoi2007_lizard","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/wjmzbmr\/?p=206","title":{"rendered":"[SCOI2007]\u8725\u8734"},"content":{"rendered":"

SCOI2007]\u8725\u8734<\/p>\n

Time Limit:1000MS  Memory Limit:165536K
Total Submit:44 Accepted:29<\/p>\n

Description <\/strong><\/p>\n

\u5728\u4e00\u4e2ar\u884cc\u5217\u7684\u7f51\u683c\u5730\u56fe\u4e2d\u6709\u4e00\u4e9b\u9ad8\u5ea6\u4e0d\u540c\u7684\u77f3\u67f1\uff0c\u4e00\u4e9b\u77f3\u67f1\u4e0a\u7ad9\u7740\u4e00\u4e9b\u8725\u8734\uff0c\u4f60\u7684\u4efb\u52a1\u662f\u8ba9\u5c3d\u91cf\u591a\u7684\u8725\u8734\u9003\u5230\u8fb9\u754c\u5916\u3002
\u6bcf\u884c\u6bcf\u5217\u4e2d\u76f8\u90bb\u77f3\u67f1\u7684\u8ddd\u79bb\u4e3a1\uff0c\u8725\u8734\u7684\u8df3\u8dc3\u8ddd\u79bb\u662fd\uff0c\u5373\u8725\u8734\u53ef\u4ee5\u8df3\u5230\u5e73\u9762\u8ddd\u79bb\u4e0d\u8d85\u8fc7d\u7684\u4efb\u4f55\u4e00\u4e2a\u77f3\u67f1\u4e0a\u3002\u77f3\u67f1\u90fd\u4e0d\u7a33\u5b9a\uff0c\u6bcf\u6b21\u5f53\u8725\u8734\u8df3\u8dc3\u65f6\uff0c\u6240\u79bb\u5f00 \u7684\u77f3\u67f1\u9ad8\u5ea6\u51cf1\uff08\u5982\u679c\u4ecd\u7136\u843d\u5728\u5730\u56fe\u5185\u90e8\uff0c\u5219\u5230\u8fbe\u7684\u77f3\u67f1\u9ad8\u5ea6\u4e0d\u53d8\uff09\uff0c\u5982\u679c\u8be5\u77f3\u67f1\u539f\u6765\u9ad8\u5ea6\u4e3a1\uff0c\u5219\u8725\u8734\u79bb\u5f00\u540e\u6d88\u5931\u3002\u4ee5\u540e\u5176\u4ed6\u8725\u8734\u4e0d\u80fd\u843d\u811a\u3002\u4efb\u4f55\u65f6\u523b\u4e0d\u80fd\u6709\u4e24\u53ea \u8725\u8734\u5728\u540c\u4e00\u4e2a\u77f3\u67f1\u4e0a\u3002 <\/p>\n

Input <\/strong><\/p>\n

\u8f93\u5165\u7b2c\u4e00\u884c\u4e3a\u4e09\u4e2a\u6574\u6570r\uff0cc\uff0cd\uff0c\u5373\u5730\u56fe\u7684\u89c4\u6a21\u4e0e\u6700\u5927\u8df3\u8dc3\u8ddd\u79bb\u3002\u4ee5\u4e0br\u884c\u4e3a\u77f3\u7af9\u7684\u521d\u59cb\u72b6\u6001\uff0c0\u8868\u793a\u6ca1\u6709\u77f3\u67f1\uff0c1~3\u8868\u793a\u77f3\u67f1\u7684\u521d\u59cb\u9ad8\u5ea6\u3002\u4ee5\u4e0br\u884c\u4e3a\u8725\u8734\u4f4d \u7f6e\uff0c\u201cL\u201d\u8868\u793a\u8725\u8734\uff0c\u201c.\u201d\u8868\u793a\u6ca1\u6709\u8725\u8734\u3002 <\/p>\n

Output <\/strong><\/p>\n

\u8f93\u51fa\u4ec5\u4e00\u884c\uff0c\u5305\u542b\u4e00\u4e2a\u6574\u6570\uff0c\u5373\u65e0\u6cd5\u9003\u79bb\u7684\u8725\u8734\u603b\u6570\u7684\u6700\u5c0f\u503c\u3002 <\/p>\n

Sample Input <\/strong><\/p>\n

5 8 2
00000000
02000000
00321100
02000000
00000000
……..
……..
..LLLL..
……..
……..<\/p>\n

Sample Output <\/strong><\/p>\n

1<\/p>\n

Hint <\/strong><\/p>\n

100%\u7684\u6570\u636e\u6ee1\u8db3\uff1a1<=r, c<=20, 1<=d<=3 <\/p>\n

Source <\/strong><\/p>\n

Pku 2711 Leapin’ Lizards
\u6709\u70b9\u6c34\u7684\u7f51\u7edc\u6d41\uff0c\u76f4\u63a5\u62c6\u70b9\u6784\u56fe\u5c31\u53ef\u4ee5\u4e86\u3002\u3002
Code\uff1a<\/p>\n

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
#include<cstring>
#include<cmath>
#define rep(i,n) for(int i=0;i<n;i++)
#define pb push_back
using namespace std;
typedef pair<int,int> ii;
const int inf=~0U>>1,maxn=20,maxv=maxn*maxn*2+2;
int n,m;
inline int In(int i,int j){return (i*m+j)*2;}
inline int Out(int i,int j){return In(i,j)+1;}
struct Edge
{
int t,c;
Edge*next,*op;
Edge(int _t,int _c,Edge*_next):t(_t),c(_c),next(_next){}
}*E[maxv]={0};
int h[maxv],vh[maxv],vs,vt,v;
void InsEdge(int s,int t,int c)
{
E[s]=new Edge(t,c,E[s]);
E[t]=new Edge(s,0,E[t]);
E[s]->op=E[t];E[t]->op=E[s];
}
int aug(int no,int m)
{
if(no==vt) return m;
int l=m;
for(Edge*i=E[no];i;i=i->next)if(i->c&&h[no]==h[i->t]+1)
{
int d=aug(i->t,min(i->c,l));
l-=d,i->c-=d,i->op->c+=d;
if(l==0||h[vs]>=v)return m-l;
}
int minh=v;
for(Edge*i=E[no];i;i=i->next)if(i->c&&h[i->t]+1<minh)
minh=h[i->t]+1;
if(–vh[h[no]]==0) h[vs]=v;vh[h[no]=minh]++;
return m-l;
}
int CalFlow()
{
memset(h,0,sizeof(h));
memset(vh,0,sizeof(vh));
vh[0]=v;
int flow=0;while(h[vs]<v)flow+=aug(vs,inf);
return flow;
}
inline int Dist(ii a,ii b){return abs(a.first-b.first)+abs(a.second-b.second);}
inline int DistToExit(int x,int y){return min(x+1,min(n-x,min(y+1,m-y)));}
int main()
{
\/\/freopen("in","r",stdin);
int x,d,a=0;char c;cin>>n>>m>>d;v=n*m*2+2;vs=v-1;vt=vs-1;
rep(i,n)rep(j,m){cin>>c;x=c-‘0’;if(x)InsEdge(In(i,j),Out(i,j),x);}
rep(i,n)rep(j,m){cin>>c;if(c==’L’) InsEdge(vs,In(i,j),1),a++;}
rep(i,n)rep(j,m)rep(a,n)rep(b,m)if(Dist(ii(i,j),ii(a,b))<=d) InsEdge(Out(i,j),In(a,b),inf);
rep(i,n)rep(j,m)if(DistToExit(i,j)<=d) InsEdge(Out(i,j),vt,inf);
cout<<a-CalFlow()<<endl;
}<\/p>\n","protected":false},"excerpt":{"rendered":"

SCOI2007]\u8725\u8734 Time Limit:1000MS  Memory Limit:165536KTotal Submit:44 Accepted:29 Description \u5728\u4e00\u4e2ar\u884cc\u5217\u7684\u7f51\u683c\u5730\u56fe\u4e2d\u6709\u4e00\u4e9b\u9ad8\u5ea6\u4e0d\u540c\u7684\u77f3\u67f1\uff0c\u4e00\u4e9b\u77f3\u67f1\u4e0a\u7ad9\u7740\u4e00\u4e9b\u8725\u8734\uff0c\u4f60\u7684\u4efb\u52a1\u662f\u8ba9\u5c3d\u91cf\u591a\u7684\u8725\u8734\u9003\u5230\u8fb9\u754c\u5916\u3002 \u6bcf\u884c\u6bcf\u5217\u4e2d\u76f8\u90bb\u77f3\u67f1\u7684\u8ddd\u79bb\u4e3a1\uff0c\u8725\u8734\u7684\u8df3\u8dc3\u8ddd\u79bb\u662fd\uff0c\u5373\u8725\u8734\u53ef\u4ee5\u8df3\u5230\u5e73\u9762\u8ddd\u79bb\u4e0d\u8d85\u8fc7d\u7684\u4efb\u4f55\u4e00\u4e2a\u77f3\u67f1\u4e0a\u3002\u77f3\u67f1\u90fd\u4e0d\u7a33\u5b9a\uff0c\u6bcf\u6b21\u5f53\u8725\u8734\u8df3\u8dc3\u65f6\uff0c\u6240\u79bb\u5f00 \u7684\u77f3\u67f1\u9ad8\u5ea6\u51cf1\uff08\u5982\u679c\u4ecd\u7136\u843d\u5728\u5730\u56fe\u5185\u90e8\uff0c\u5219\u5230\u8fbe\u7684\u77f3\u67f1\u9ad8\u5ea6\u4e0d\u53d8\uff09\uff0c\u5982\u679c\u8be5\u77f3\u67f1\u539f\u6765\u9ad8\u5ea6\u4e3a1\uff0c\u5219\u8725\u8734\u79bb\u5f00\u540e\u6d88\u5931\u3002\u4ee5\u540e\u5176\u4ed6\u8725\u8734\u4e0d\u80fd\u843d\u811a\u3002\u4efb\u4f55\u65f6\u523b\u4e0d\u80fd\u6709\u4e24\u53ea \u8725\u8734\u5728\u540c\u4e00\u4e2a\u77f3\u67f1\u4e0a\u3002 Input \u8f93\u5165\u7b2c\u4e00\u884c\u4e3a\u4e09\u4e2a\u6574\u6570r\uff0cc\uff0cd\uff0c\u5373\u5730\u56fe\u7684\u89c4\u6a21\u4e0e\u6700\u5927\u8df3\u8dc3\u8ddd\u79bb\u3002\u4ee5\u4e0br\u884c\u4e3a\u77f3\u7af9\u7684\u521d\u59cb\u72b6\u6001\uff0c0\u8868\u793a\u6ca1\u6709\u77f3\u67f1\uff0c1~3\u8868\u793a\u77f3\u67f1\u7684\u521d\u59cb\u9ad8\u5ea6\u3002\u4ee5\u4e0br\u884c\u4e3a\u8725\u8734\u4f4d \u7f6e\uff0c\u201cL\u201d\u8868\u793a\u8725\u8734\uff0c\u201c.\u201d\u8868\u793a\u6ca1\u6709\u8725\u8734\u3002 Output \u8f93\u51fa\u4ec5\u4e00\u884c\uff0c\u5305\u542b\u4e00\u4e2a\u6574\u6570\uff0c\u5373\u65e0\u6cd5\u9003\u79bb\u7684\u8725\u8734\u603b\u6570\u7684\u6700\u5c0f\u503c\u3002 Sample Input 5 8 20000000002000000003211000200000000000000……..……….LLLL..……..…….. Sample Output 1 Hint 100%\u7684\u6570\u636e\u6ee1\u8db3\uff1a1<=r, c<=20, 1<=d<=3 Source Pku 2711 Leapin’ Lizards\u6709\u70b9\u6c34\u7684\u7f51\u7edc\u6d41\uff0c\u76f4\u63a5\u62c6\u70b9\u6784\u56fe\u5c31\u53ef\u4ee5\u4e86\u3002\u3002Code\uff1a #include<cstdio>#include<iostream>#include<algorithm>#include<string>#include<vector>#include<cstring>#include<cmath>#define rep(i,n) for(int i=0;i<n;i++)#define pb push_backusing namespace std;typedef pair<int,int> ii;const int inf=~0U>>1,maxn=20,maxv=maxn*maxn*2+2;int n,m;inline int In(int i,int j){return (i*m+j)*2;}inline int Out(int i,int […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/206"}],"collection":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=206"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/206\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}