mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
160 lines
3.5 KiB
C++
160 lines
3.5 KiB
C++
|
#include <stdio.h>
|
||
|
#include <string.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <climits>
|
||
|
#include <algorithm>
|
||
|
using namespace std;
|
||
|
#define min(a,b)(a)<(b)?(a):(b)
|
||
|
const int INF=INT_MAX;
|
||
|
const int maxn=2000;
|
||
|
const int maxm=10000000;
|
||
|
struct node
|
||
|
{
|
||
|
int from,to,next,c;
|
||
|
}e[maxm];
|
||
|
int tot;
|
||
|
int head[maxn];
|
||
|
void add(int s,int u,int f1,int f2)
|
||
|
{
|
||
|
e[tot].from=s;
|
||
|
e[tot].to=u;
|
||
|
e[tot].c=f1;
|
||
|
e[tot].next=head[s];
|
||
|
head[s]=tot++;
|
||
|
e[tot].from=u;
|
||
|
e[tot].to=s;
|
||
|
e[tot].c=f2;
|
||
|
e[tot].next=head[u];
|
||
|
head[u]=tot++;
|
||
|
}
|
||
|
int q[maxn];
|
||
|
int cnt[maxn];
|
||
|
int d[maxn];
|
||
|
int low[maxn];
|
||
|
int cur[maxn];
|
||
|
int maxflow(int s,int t,int n)
|
||
|
{
|
||
|
int *front=q,*rear=q;
|
||
|
for(int i=0;i<n;i++)
|
||
|
{
|
||
|
d[i]=n;
|
||
|
cnt[i]=0;
|
||
|
}
|
||
|
cnt[n]=n-1;
|
||
|
cnt[0]++;
|
||
|
d[t]=0;
|
||
|
*rear++=t;
|
||
|
while(front<rear)
|
||
|
{
|
||
|
int v=*front++;
|
||
|
for(int i=head[v];i!=-1;i=e[i].next)
|
||
|
{
|
||
|
if(d[e[i].to]==n&&e[i^1].c>0)
|
||
|
{
|
||
|
d[e[i].to]=d[v]+1;
|
||
|
cnt[n]--;
|
||
|
cnt[d[e[i].to]]++;
|
||
|
*rear++=e[i].to;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
int flow=0, u=s, top=0;
|
||
|
low[0]=INF;
|
||
|
for(int i=0;i<n;i++)
|
||
|
cur[i]=head[i];
|
||
|
while(d[s]<n)
|
||
|
{
|
||
|
int &i=cur[u];
|
||
|
for(;i!=-1;i=e[i].next)
|
||
|
{
|
||
|
if(e[i].c>0&&d[u]==d[e[i].to]+1)
|
||
|
{
|
||
|
low[top+1]=min(low[top],e[i].c);
|
||
|
q[++top]=i;
|
||
|
u=e[i].to;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if(i!=-1)
|
||
|
{
|
||
|
if(u==t)
|
||
|
{
|
||
|
int minf=low[top];
|
||
|
for(int p=1,i;p<=top;++p)
|
||
|
{
|
||
|
i=q[p];
|
||
|
e[i].c-=minf;
|
||
|
e[i^1].c+=minf;
|
||
|
}
|
||
|
flow+=minf;
|
||
|
u=s;
|
||
|
low[0]=INF;
|
||
|
top=0;
|
||
|
}
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
int old_du=d[u];
|
||
|
cnt[old_du]--;
|
||
|
d[u]=n-1;
|
||
|
for(int i=head[u];i!=-1;i=e[i].next)
|
||
|
if(e[i].c>0&&d[u]>d[e[i].to])
|
||
|
d[u]=d[e[i].to];
|
||
|
cnt[++d[u]]++;
|
||
|
if(d[u]<n)
|
||
|
cur[u]=head[u];
|
||
|
if(u!=s)
|
||
|
{
|
||
|
u=e[q[top]].from;
|
||
|
--top;
|
||
|
}
|
||
|
if(cnt[old_du]==0)
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
return flow;
|
||
|
}
|
||
|
struct edge
|
||
|
{
|
||
|
int st,en,c,d;
|
||
|
}ta[205];
|
||
|
int di[500];
|
||
|
int main()
|
||
|
{
|
||
|
int i, j, k, n, m;
|
||
|
int sum;
|
||
|
while(scanf("%d %d",&m, &n)!=EOF)
|
||
|
{
|
||
|
tot = 0;
|
||
|
sum = 0;
|
||
|
memset(head,-1,sizeof(head));
|
||
|
int s = 0;
|
||
|
int t = m+2*m;
|
||
|
int a,b,c,d;
|
||
|
int top = 0;
|
||
|
for(i = 1; i <= m; i++)
|
||
|
{
|
||
|
scanf("%d %d %d %d",&ta[i].st, &ta[i].c, &ta[i].en, &ta[i].d);
|
||
|
di[top++] = ta[i].st;
|
||
|
di[top++] = ta[i].en;
|
||
|
}
|
||
|
sort(di,di+top);
|
||
|
top--;
|
||
|
for(i = 1; i <= top; i++)
|
||
|
add(i+m,t,(di[i]-di[i-1])*n,0);
|
||
|
for(i = 1; i <= m; i++)
|
||
|
{
|
||
|
add(s,i,ta[i].c*ta[i].d,0);
|
||
|
sum += ta[i].c*ta[i].d;
|
||
|
for(j = 1; j <= top; j++)
|
||
|
if(ta[i].st<=di[j-1]&&di[j] <=ta[i].en)
|
||
|
add(i,j+m,INF,0);
|
||
|
}
|
||
|
int res = maxflow(s,t,t+1);
|
||
|
if(res == sum)
|
||
|
printf("Yes\n");
|
||
|
else printf("No\n");
|
||
|
}
|
||
|
return 0;
|
||
|
}
|