CF787D Legacy

codeforces

线段树优化建图的裸题

代码：

#include<cstdio>
#include<algorithm>
#include<iostream>
#include<cstring>
#include<queue>
using namespace std;
#define rg register
void read(int &x){
    char ch;bool ok;
    for(ok=0,ch=getchar();!isdigit(ch);ch=getchar())if(ch=='-')ok=1;
    for(x=0;isdigit(ch);x=x*10+ch-'0',ch=getchar());if(ok)x=-x;
}
const int maxn=2e5+10;
int cnt,pre[maxn*20],nxt[maxn*20],h[maxn*10],val[maxn*20],pos[maxn*10];
int id,n,m,s;long long dis[maxn*10];bool vis[maxn*10];
struct oo{int x;long long y;};
priority_queue<oo>q;
bool operator<(oo a,oo b){return a.y>b.y;}
void add(int x,int y,int z){pre[++cnt]=y,nxt[cnt]=h[x],h[x]=cnt,val[cnt]=z;}
void build_in(int x,int l,int r){
    int mid=(l+r)>>1;id=max(id,x);
    if(l==r)return pos[l]=x,void();
    build_in(x<<1,l,mid),build_in(x<<1|1,mid+1,r);
    add(x,x<<1,0),add(x,x<<1|1,0);
}
void build_out(int x,int l,int r){
    add(x,x+id,0);int mid=(l+r)>>1;
    if(x!=1)add(x+id,(x>>1)+id,0);if(l==r)return ;
    build_out(x<<1,l,mid),build_out(x<<1|1,mid+1,r);
}
void change_in(int x,int l,int r,int a,int b,int c,int d){
    if(a<=l&&b>=r)return add(c,x,d),void();
    int mid=(l+r)>>1;
    if(a<=mid)change_in(x<<1,l,mid,a,b,c,d);
    if(b>mid)change_in(x<<1|1,mid+1,r,a,b,c,d);
}
void change_out(int x,int l,int r,int a,int b,int c,int d){
    if(a<=l&&b>=r)return add(x+id,c,d),void();
    int mid=(l+r)>>1;
    if(a<=mid)change_out(x<<1,l,mid,a,b,c,d);
    if(b>mid)change_out(x<<1|1,mid+1,r,a,b,c,d);
}
void dijkstra(int s){
    memset(dis,63,sizeof dis);
    q.push((oo){s,dis[s]=0});
    while(!q.empty()){
    int x=q.top().x;q.pop();if(vis[x])continue;vis[x]=1;
    for(rg int i=h[x];i;i=nxt[i])
        if(!vis[pre[i]]&&dis[pre[i]]>dis[x]+val[i]){
        dis[pre[i]]=dis[x]+val[i];
        q.push((oo){pre[i],dis[pre[i]]});
        }
    }
}
int main(){
    read(n),read(m),read(s);build_in(1,1,n),build_out(1,1,n);
    for(rg int i=1,t,x,y,u,v;i<=m;i++){
    read(t);
    if(t==1){
        read(y),read(x),read(v);
        add(pos[y]+id,pos[x],v);
    }
    if(t==2){
        read(u),read(x),read(y),read(v);
        change_in(1,1,n,x,y,pos[u]+id,v);
    }
    if(t==3){
        read(u),read(x),read(y),read(v);
        change_out(1,1,n,x,y,pos[u],v); 
    }
    }
    dijkstra(pos[s]);
    for(rg int i=1;i<=n;i++)printf("%lld ",dis[pos[i]]>1e16?-1:dis[pos[i]]);
}

CF787D Legacy

原文：https://www.cnblogs.com/lcxer/p/11505732.html