제출 #441635

#제출 시각아이디문제언어결과실행 시간메모리
441635julian33선물상자 (IOI15_boxes)C++14
70 / 100
1395 ms524288 KiB
#include <bits/stdc++.h> using namespace std; #ifdef LOCAL #define deb(...) logger(#__VA_ARGS__, __VA_ARGS__) template<typename ...Args> void logger(string vars, Args&&... values) { cerr<<vars<<" = "; string delim=""; (...,(cerr<<delim<<values,delim=", ")); cerr<<"\n"; } #else #define deb(...) logger(#__VA_ARGS__, __VA_ARGS__) template<typename ...Args> void logger(string vars, Args&&... values) {} #endif #define pb push_back #define sz(x) (int)(x.size()) typedef long long ll; typedef pair<int,int> pii; typedef pair<ll,ll> pll; template<typename T> inline void maxa(T& a,T b){a=max(a,b);} template<typename T> inline void mina(T& a,T b){a=min(a,b);} const int mxN=1e6+5; ll st[2][4*mxN]; void upd(int v,int l,int r,int ind,ll val,int t){ if(l>ind || r<ind) return; if(l==r){ st[t][v]=val; } else{ int m=(l+r)>>1; upd(v<<1,l,m,ind,val,t); upd(v<<1|1,m+1,r,ind,val,t); st[t][v]=min(st[t][v<<1],st[t][v<<1|1]); } } ll query(int v,int l,int r,int lq,int rq,int t){ if(lq>rq) return 1e18; if(l>=lq && r<=rq) return st[t][v]; int m=(l+r)>>1; return min(query(v<<1,l,m,lq,min(rq,m),t),query(v<<1|1,m+1,r,max(lq,m+1),rq,t)); } ll delivery(int N, int K, int L, int positions[]){ ll ans=0; vector<int> pos; for(int i=0;i<N;i++){ if(positions[i]) pos.pb(positions[i]); } int n=sz(pos); vector<ll> pref(n),suff(n); fill(st[0],st[0]+4*n+5,1e18); for(int i=0;i<n;i++){ if(i<K){ pref[i]=min(2*pos[i],L); } else{ pref[i]=min(2*pos[i],L)+query(1,1,n,i-K+1,i,0); } upd(1,1,n,i+1,pref[i],0); } fill(st[1],st[1]+4*n+5,1e18); for(int i=n-1;i>=0;i--){ if(n-i-1<K){ suff[i]=min(2*(L-pos[i]),L); } else{ suff[i]=min(2*(L-pos[i]),L)+query(1,1,n,i+2,i+1+K,1); } upd(1,1,n,i+1,suff[i],1); } ans=min(pref[n-1],suff[0]); for(int i=0;i<n-1;i++){ mina(ans,pref[i]+suff[i+1]); } return ans; }
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