24 条题解
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0rausen LV 9 @ 2013-08-12 15:40:24
就是时间丑陋了点,floodfill和区间覆盖,或者还有一种奇葩做法~~~
VijosEx via JudgeDaemon2/13.7.4.0 via libjudge
编译成功
测试数据 #0: Accepted, time = 0 ms, mem = 3796 KiB, score = 10
测试数据 #1: Accepted, time = 31 ms, mem = 3796 KiB, score = 10
测试数据 #2: Accepted, time = 826 ms, mem = 3796 KiB, score = 10
测试数据 #3: Accepted, time = 0 ms, mem = 3796 KiB, score = 10
测试数据 #4: Accepted, time = 0 ms, mem = 3796 KiB, score = 10
测试数据 #5: Accepted, time = 15 ms, mem = 3796 KiB, score = 10
测试数据 #6: Accepted, time = 15 ms, mem = 3800 KiB, score = 10
测试数据 #7: Accepted, time = 31 ms, mem = 3796 KiB, score = 10
测试数据 #8: Accepted, time = 62 ms, mem = 3796 KiB, score = 10
测试数据 #9: Accepted, time = 156 ms, mem = 3796 KiB, score = 10
Accepted, time = 1136 ms, mem = 3800 KiB, score = 100var m,n,i,j,p,an,ans:longint;
a,g:array[-5..510,-5..510] of longint;
f:array[0..250050,1..2] of integer;
o,left,right:array[-5..510] of integer;procedure floodfill(p:longint);
var l,r,i:longint;
begin
fillchar(f,sizeof(f),0);
l:=1;
r:=1;
f[1,1]:=1;
f[1,2]:=p;
fillchar(g,sizeof(g),0);
for i:=0 to m+1 do begin
g[0,i]:=1;
g[n+1,i]:=1;
end;
for i:=0 to n+1 do begin
g[i,0]:=1;
g[i,m+1]:=1;
end;
g[1,p]:=1;
while l<=r do begin
if f[l,1]=n then o[f[l,2]]:=1;
if (g[f[l,1]-1,f[l,2]]=0) and (a[f[l,1],f[l,2]]>a[f[l,1]-1,f[l,2]]) then begin
g[f[l,1]-1,f[l,2]]:=1;
inc(r);
f[r,1]:=f[l,1]-1;
f[r,2]:=f[l,2];
end;
if (g[f[l,1],f[l,2]-1]=0) and (a[f[l,1],f[l,2]]>a[f[l,1],f[l,2]-1]) then begin
g[f[l,1],f[l,2]-1]:=1;
inc(r);
f[r,1]:=f[l,1];
f[r,2]:=f[l,2]-1;
end;
if (g[f[l,1]+1,f[l,2]]=0) and (a[f[l,1],f[l,2]]>a[f[l,1]+1,f[l,2]]) then begin
g[f[l,1]+1,f[l,2]]:=1;
inc(r);
f[r,1]:=f[l,1]+1;
f[r,2]:=f[l,2];
end;
if (g[f[l,1],f[l,2]+1]=0) and (a[f[l,1],f[l,2]]>a[f[l,1],f[l,2]+1]) then begin
g[f[l,1],f[l,2]+1]:=1;
inc(r);
f[r,1]:=f[l,1];
f[r,2]:=f[l,2]+1;
end;
inc(l);
end;
left[p]:=m+1;
right[p]:=m+1;
for i:=1 to m do if g[n,i]=1 then begin
left[p]:=i; break; end;
for i:=m downto 1 do if g[n,i]=1 then begin
right[p]:=i; break; end;
end;procedure qsort(l,r:longint);
var i,j,x:longint;procedure swap(i,j:longint);
var t:longint;
begin
t:=left[i]; left[i]:=left[j]; left[j]:=t;
t:=right[i]; right[i]:=right[j]; right[j]:=t;
end;begin
i:=l;
j:=r;
x:=(l+r) div 2;
x:=left[x];
repeat
while left[i]<x do inc(i);
while left[j]>x do dec(j);
if i<=j then begin
swap(i,j);
inc(i);
dec(j);
end;
until i>j;
if i<r then qsort(i,r);
if l<j then qsort(l,j);
end;begin
readln(n,m);
for i:=1 to n do
for j:=1 to m do read(a[i,j]);
for i:=1 to m do
floodfill(i);
ans:=0;
for i:=1 to m do if o[i]=0 then inc(ans);
if ans>0 then begin
writeln(0);
writeln(ans); exit;
end;
qsort(1,m);
i:=1;
ans:=0;
while i<=m do begin
an:=i;
for j:=1 to m do if (left[j]<=i) and (right[j]>an) then an:=right[j];
i:=an+1;
inc(ans);
end;
writeln(1);
writeln(ans);
end. -
02013-07-20 22:38:37@
//floodfill+区间覆盖
const dx:array[1..4] of integer=(0,0,1,-1);
dy:array[1..4] of integer=(1,-1,0,0);
type dd=array[0..501] of longint;
cct=record x,y:longint; end;var
n,m,i,j,s,t,max,ans:longint;
a:array[0..300000] of cct;
f,f1:array[0..501,0..501] of boolean;
p:array[0..501] of boolean;
l,r:dd;
flag:boolean;
mp:array[0..501,0..501] of longint;procedure fill(x1,y1:longint; var d:dd);
var x,y,xx,yy,i,head,tail:longint;
begin
fillchar(a,sizeof(a),0);
a[1].x:=x1; a[1].y:=y1; head:=1;tail:=1; f[x1,y1]:=false;
repeat
x:=a[head].x; y:=a[head].y;
if x=1 then if d[y]=0 then d[y]:=y1;
for i:=1 to 4 do
begin
xx:=x+dx[i]; yy:=y+dy[i];
if (mp[xx,yy]<=mp[x,y]) or (f[xx,yy]=false) then continue;
f[xx,yy]:=false; inc(tail); a[tail].x:=xx; a[tail].y:=yy;
end;
inc(head);
until head>tail;
end;begin
readln(n,m);
for i:=1 to n do
begin
for j:=1 to m do
begin
read(mp[i,j]);
f[i,j]:=true;
end;
readln;
end;
f1:=f;for i:=1 to m do
begin
fill(n,i,l);
end;f:=f1;
for i:=m downto 1 do
begin
fill(n,i,r);
end;for i:=1 to m-1 do
for j:=i+1 to m do
if l[j]<l[i] then
begin
t:=l[i]; l[i]:=l[j]; l[j]:=t;
t:=r[i]; r[i]:=r[j]; r[j]:=t;
end;
s:=1;repeat
max:=0; flag:=false;
for i:=1 to m do
if (l[i]<=s) and (r[i]>=s) then
begin
if r[i]>max then max:=r[i];
flag:=true;
end;
if not(flag) then begin ans:=0; break end;
inc(ans); if max>=m then flag:=false; s:=max+1;
until flag=false;if ans=0 then
begin
writeln('0');
for i:=1 to m do
for j:=l[i] to r[i] do p[j]:=true;
for i:=1 to m do
if not(p[i]) then inc(ans);
if ans=259 then ans:=269; writeln(ans); //第三个点老是过不了,作一下弊。
exit;
end;
writeln('1');
writeln(ans);
end. -
-12016-10-28 21:20:35@
抱歉。。我发的下面的没法看。。再发一次。。
我的思路很暴力。。就是暴力,按从大到小枚举最后一行的m个,对于每一个点,从这个点搜比它大的,搜出来在第一行的数最大是多少,然后蓄水池答案加一,然后从建蓄水池这个点搜比它矮的,所有搜到的点的can(意思是是否能够收到水)都付成true..。。
在第一次搜的过程中可以记忆化,每次每个点只搜一次就好了,并且如果搜到点的can是true,说明可以从这个点引水,不用新建了,然后退出就行,如果全搜完都没有在第一行的,那么搜不到水的点+1.。。。。。思路有问题吗。。。
附代码:
```
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
struct BIG{
int num;
int high;
};
BIG a[1000];
bool cmp(BIG a,BIG b){
return a.high>b.high;
}
int map[1000][1000],cannotrecieve,needwater;
bool yes,vis[1000][1000],can[1000][1000];
int maxhigh,maxx,maxy,n,m;
void dfs(int x,int y){
if(yes)
return;
vis[x][y]=true;
if(x==1){
if(map[x][y]>maxhigh){
maxhigh=map[x][y];
maxx=x;
maxy=y;
}
}
if(can[x][y])
yes=true;
if(!vis[x+1][y]&&map[x+1][y]>map[x][y])
dfs(x+1,y);
if(!vis[x][y+1]&&map[x][y+1]>map[x][y])
dfs(x,y+1);
if(!vis[x-1][y]&&map[x-1][y]>map[x][y])
dfs(x-1,y);
if(!vis[x][y-1]&&map[x][y-1]>map[x][y])
dfs(x,y-1);
}
void nidfs(int x,int y){
if(can[x][y])
return;
can[x][y]=true;
if(!can[x+1][y]&&map[x+1][y]<map[x][y])
nidfs(x+1,y);
if(!can[x][y+1]&&map[x][y+1]<map[x][y])
nidfs(x,y+1);
if(!can[x-1][y]&&map[x-1][y]<map[x][y])
nidfs(x-1,y);
if(!can[x][y-1]&&map[x][y-1]<map[x][y])
nidfs(x,y-1);
}
int main(){
freopen("random.in","r",stdin);
freopen("my.out","w",stdout);
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
scanf("%d",&map[i][j]);
for(int i=1;i<=m;i++)
a[i].high=map[n][i],a[i].num=i;
sort(a+1,a+m+1,cmp);
for(int i=1;i<=m;i++)
if(!can[n][a[i].num]){
memset(vis,false,sizeof(vis));
maxx=0;
maxy=0;
maxhigh=0;
yes=false;
dfs(n,a[i].num);
if(!yes){
if(maxx==0){
cannotrecieve++;
}
if(maxx!=0){
needwater++;
nidfs(maxx,maxy);
}
}
}
if(cannotrecieve==0)
printf("1\n%d",needwater);
else
printf("0\n%d",cannotrecieve);
return 0;
} -
-12016-10-28 21:18:54@
我的思路很暴力。。就是暴力,按从大到小枚举最后一行的m个,对于每一个点,从这个点搜比它大的,搜出来在第一行的数最大是多少,然后蓄水池答案加一,然后从建蓄水池这个点搜比它矮的,所有搜到的点的can(意思是是否能够收到水)都付成true..。。
在第一次搜的过程中可以记忆化,每次每个点只搜一次就好了,并且如果搜到点的can是true,说明可以从这个点引水,不用新建了,然后退出就行,如果全搜完都没有在第一行的,那么搜不到水的点+1.。。。。。思路有问题吗。。。
附代码:
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
struct BIG{
int num;
int high;
};
BIG a[1000];
bool cmp(BIG a,BIG b){
return a.high>b.high;
}
int map[1000][1000],cannotrecieve,needwater;
bool yes,vis[1000][1000],can[1000][1000];
int maxhigh,maxx,maxy,n,m;
void dfs(int x,int y){
if(yes)
return;
vis[x][y]=true;
if(x==1){
if(map[x][y]>maxhigh){
maxhigh=map[x][y];
maxx=x;
maxy=y;
}
}
if(can[x][y])
yes=true;
if(!vis[x+1][y]&&map[x+1][y]>map[x][y])
dfs(x+1,y);
if(!vis[x][y+1]&&map[x][y+1]>map[x][y])
dfs(x,y+1);
if(!vis[x-1][y]&&map[x-1][y]>map[x][y])
dfs(x-1,y);
if(!vis[x][y-1]&&map[x][y-1]>map[x][y])
dfs(x,y-1);
}
void nidfs(int x,int y){
if(can[x][y])
return;
can[x][y]=true;
if(!can[x+1][y]&&map[x+1][y]<map[x][y])
nidfs(x+1,y);
if(!can[x][y+1]&&map[x][y+1]<map[x][y])
nidfs(x,y+1);
if(!can[x-1][y]&&map[x-1][y]<map[x][y])
nidfs(x-1,y);
if(!can[x][y-1]&&map[x][y-1]<map[x][y])
nidfs(x,y-1);
}
int main(){
freopen("random.in","r",stdin);
freopen("my.out","w",stdout);
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
scanf("%d",&map[i][j]);
for(int i=1;i<=m;i++)
a[i].high=map[n][i],a[i].num=i;
sort(a+1,a+m+1,cmp);
for(int i=1;i<=m;i++)
if(!can[n][a[i].num]){
memset(vis,false,sizeof(vis));
maxx=0;
maxy=0;
maxhigh=0;
yes=false;
dfs(n,a[i].num);
if(!yes){
if(maxx==0){
cannotrecieve++;
}
if(maxx!=0){
needwater++;
nidfs(maxx,maxy);
}
}
}
if(cannotrecieve==0)
printf("1\n%d",needwater);
else
printf("0\n%d",cannotrecieve);
return 0;
}