1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<algorithm>
#define rep(i,x,y) for(register int i=x;i<=y;++i)
#define repd(i,x,y) for(register int i=x;i>=y;--i)
#define ll long long
#define xx(i) a[i].first
#define yy(i) a[i].second
using namespace std;
const int N=1e5+7;
typedef pair<int,int> s;
s b[N],a[N];
ll dp[107][N];
int n,nn,m,q[N];
inline int (s x,s y){return x.first==y.first?x.second>y.second:x.first>y.first;}
inline ll Y(int x,int y,int c){return dp[c][x]-dp[c][y];}
inline ll X(int x,int y){return 1LL*xx(y+1)-xx(x+1);}
int main(){
while(~scanf("%d%d",&nn,&m)){
int l=1,r=1;n=0;
rep(i,1,nn)scanf("%d%d",&b[i].first,&b[i].second);
sort(b+1,b+nn+1,cmp);
while(l<=nn){
r=l+1;
while(r<=nn&&b[l].second>=b[r].second)
++r;
a[++n]=b[l];
l=r;
}
rep(i,1,n)dp[1][i]=1LL*xx(1)*yy(i);
ll ans=dp[1][n];
rep(j,2,m){
int head=1,tail=1;
rep(i,1,n){
while(head<tail&&Y(q[head+1],q[head],j-1)<=X(q[head+1],q[head])*yy(i))++head;
dp[j][i]=dp[j-1][q[head]]+1LL*xx(q[head]+1)*yy(i);
while(head<tail&&Y(q[tail],i,j-1)*X(q[tail-1],q[tail])<=Y(q[tail-1],q[tail],j-1)*X(q[tail],i))--tail;
q[++tail]=i;
}
if(ans<=dp[j][n])break;
else ans=dp[j][n];
}
printf("%lldn",ans);
}
return 0;
}
|
近期评论