Submission #1009051

#TimeUsernameProblemLanguageResultExecution timeMemory
1009051imarnTreatment Project (JOI20_treatment)C++14
100 / 100
120 ms21840 KiB
#include<bits/stdc++.h> #pragma GCC optimize("O3") #pragma GCC target("avx2") #define ll long long #define pii pair<int,int> #define pll pair<ll,ll> #define plx pair<ll,int> #define f first #define s second #define pb push_back #define all(x) x.begin(),x.end() #define vi vector<int> using namespace std; const int mxn=2e5+5; int l[mxn],r[mxn],t[mxn],c[mxn],id[mxn],rid[mxn]; struct tree{ pii a[4*mxn]; void build(int sz,int x){ for(int i=0;i<sz;i++)a[i+sz]={l[rid[i+1]]+x*t[rid[i+1]],rid[i+1]}; for(int i=sz-1;i>0;i--)a[i]=min(a[2*i],a[2*i+1]); } void upd(int i,int amt,int sz){ i+=sz;a[i]={amt,amt};for(i>>=1;i;i>>=1)a[i]=min(a[2*i],a[2*i+1]); } pii qr(int l,int r,int sz,pii res={2e9,2e9}){ for(l+=sz,r+=sz;l<r;l>>=1,r>>=1){ if(l&1)res=min(res,a[l++]); if(r&1)res=min(res,a[--r]); }return res; } }tr[2]; ll dist[mxn]{0}; int main(){ ios_base::sync_with_stdio(0);cin.tie(0); int n,m;cin>>n>>m;vector<pii>vec; for(int i=1;i<=m;i++)cin>>t[i]>>l[i]>>r[i]>>c[i],vec.pb({t[i],i}); sort(vec.begin(),vec.end());for(int i=0;i<m;i++)id[vec[i].s]=i+1,rid[i+1]=vec[i].s; tr[0].build(m,-1);tr[1].build(m,1);priority_queue<plx,vector<plx>,greater<plx>>q; for(int i=1;i<=m;i++)dist[i]=1e18; for(int i=1;i<=m;i++){ if(l[i]==1){ dist[i]=c[i];q.push({dist[i],i}); tr[0].upd(id[i]-1,2e9,m);tr[1].upd(id[i]-1,2e9,m); } } while(!q.empty()){ auto u=q.top();q.pop(); if(u.f>dist[u.s])continue; pii x=tr[0].qr(0,id[u.s],m); while(x.f<=r[u.s]-t[u.s]+1&&x.s!=2e9){ if(dist[x.s]>u.f+c[x.s])dist[x.s]=u.f+c[x.s],q.push({dist[x.s],x.s}); tr[0].upd(id[x.s]-1,2e9,m); x=tr[0].qr(0,id[u.s],m); if(x.s==2e9)break; }x=tr[1].qr(id[u.s]-1,m,m); while(x.f<=r[u.s]+t[u.s]+1&&x.s!=2e9){ if(dist[x.s]>u.f+c[x.s])dist[x.s]=u.f+c[x.s],q.push({dist[x.s],x.s}); tr[1].upd(id[x.s]-1,2e9,m); x=tr[1].qr(id[u.s]-1,m,m); } }ll ans=1e18; for(int i=1;i<=m;i++)if(r[i]==n)ans=min(ans,dist[i]); cout<<(ans==1e18?-1:ans); }
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