Submission #943128

#TimeUsernameProblemLanguageResultExecution timeMemory
943128MilosMilutinovicEscape Route (JOI21_escape_route)C++17
0 / 100
9069 ms153304 KiB
#include "escape_route.h" #include<bits/stdc++.h> #define pb push_back #define fi first #define se second #define mp make_pair using namespace std; typedef long long ll; typedef unsigned long long ull; typedef pair<int,int> pii; typedef pair<ll,ll> pll; typedef long double ld; template <typename T> bool chkmin(T &x,T y){return x>y?x=y,1:0;} template <typename T> bool chkmax(T &x,T y){return x<y?x=y,1:0;} ll readint(){ ll x=0,f=1; char ch=getchar(); while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();} while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();} return x*f; } const ll inf=(ll)1e18; int n,tot; int v[100005],nxt[100005],h[95]; ll s,c[100005],b[100005],res[3000005]; vector<pair<ll,int>> qs[95][95]; pair<ll,ll> d[95]; void addedge(int x,int y,ll w,ll t){ v[++tot]=y; c[tot]=w; b[tot]=t; nxt[tot]=h[x]; h[x]=tot; v[++tot]=x; c[tot]=w; b[tot]=t; nxt[tot]=h[y]; h[y]=tot; } pair<ll,ll> dijkstra(int u,int v,ll t){ for(int i=0;i<n;i++) d[i]=mp(inf,0ll); d[u]=mp(0,t); set<pair<pair<ll,ll>,int>> st; st.emplace(mp(d[u],u)); while(!st.empty()){ auto it=st.begin(); int x=it->se; st.erase(it); for(int p=h[x];p;p=nxt[p]){ pair<ll,ll> nd; if(d[x].se+c[p]<=b[p]){ nd.fi=d[x].fi; nd.se=d[x].se+c[p]; }else{ nd.fi=d[x].fi+1; nd.se=c[p]; } if(nd<d[::v[p]]){ if(d[::v[p]].fi!=inf) st.erase(st.find(mp(d[::v[p]],::v[p]))); d[::v[p]]=nd; st.insert(mp(d[::v[p]],::v[p])); } } } return d[v]; } vector<ll> calculate_necessary_time( int N,int M,ll S,int Q,vector<int> A,vector<int> B, vector<ll> L,vector<ll> C,vector<int> U, vector<int> V,vector<ll> T){ n=N; s=S; for(int i=0;i<M;i++) addedge(A[i],B[i],L[i],C[i]); for(int i=0;i<Q;i++){ qs[U[i]][V[i]].pb(mp(T[i],i)); } for(int i=0;i<n;i++){ for(int j=0;j<n;j++){ sort(qs[i][j].begin(),qs[i][j].end()); int sz=(int)qs[i][j].size(); for(int k=0;k<sz;k++){ int l=k+1,r=sz-1,p=k; pair<ll,ll> tm=dijkstra(i,j,qs[i][j][k].fi); while(l<=r){ int mid=(l+r)/2; pair<ll,ll> tmp=dijkstra(i,j,qs[i][j][mid].fi); if(tmp.fi==tm.fi&&tmp.se-tm.se==qs[i][j][mid].fi-qs[i][j][k].fi) p=mid,l=mid+1; else r=mid-1; } for(int f=k;f<=p;f++) res[qs[i][j][k].se]=tm.fi*s+tm.se+(qs[i][j][f].fi-qs[i][j][k].fi)-qs[i][j][f].fi; k=p; } } } vector<ll> ret; for(int i=0;i<Q;i++) ret.pb(res[i]); return ret; }
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