제출 #334966

#제출 시각아이디문제언어결과실행 시간메모리
334966DymoHarbingers (CEOI09_harbingers)C++14
0 / 100
64 ms65540 KiB
#include<bits/stdc++.h> using namespace std; #define pb push_back #define eb emplace_back #define ll long long #define pll pair<ll,ll> #define ff first #define ss second #define endl "\n" const ll maxn=3e5+10; const ll mod =1e9+7 ; const ll base=3e18; bool ktu=false; struct Line { mutable ll k, m, p; bool operator<(const Line& o) const { return k > o.k; } bool operator<(ll x) const { return p < x; } }; struct tk : multiset<Line, less<>> { static const ll inf = LLONG_MAX; ll div(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); } bool isect(iterator x, iterator y) { if (y == end()) return x->p = inf, 0; if (x->k == y->k) x->p = x->m > y->m ? inf : -inf; else x->p = div(y->m - x->m, x->k - y->k); return x->p >= y->p; } void add(ll k, ll m) { auto z = insert({k, m, 0}), y = z++, x = y; while (isect(y, z)) z = erase(z); if (x != begin() && isect(--x, y)) isect(x, y = erase(y)); while ((y = x) != begin() && (--x)->p >= y->p) isect(x, erase(y)); } ll query(ll x) { if (empty()) return base; auto l = *lower_bound(x); return l.k * x + l.m; } }; vector<pll> adj[maxn]; ll dep[maxn]; ll dep1[maxn]; ll siz[maxn]; tk st[4*maxn]; ll par[maxn]; ll get1(ll id,ll left,ll right,ll x,ll y,ll t ) { if (x>right||y<left) return base; if (x<=left&&y>=right) { /* if (ktu) { cout <<"WTF"<<" "<<id<<" "<<st[id].query(t)<<endl; }*/ return st[id].query(t); } ll mid=(left+right)/2; return min(get1(id*2,left,mid, x, y,t ),get1(id*2+1,mid+1, right, x, y,t )); } void update(ll id,ll left,ll right,ll x,ll y,ll pos) { if (pos>right||pos<left) return ; /* if (pos==1) { cout <<left<<" "<<right<<" "<<x<<" "<<y<<" "<<id<<endl; }*/ st[id].add(x,y); if (left==right) return; ll mid=(left+right)/2; if (mid>=pos) update(id*2,left,mid,x, y, pos); else update(id*2+1, mid+1, right, x, y, pos); } void dfs(ll u,ll par1) { siz[u]=1; for (auto p:adj[u]) { ll h=p.ff; if (h==par1) continue; dep[h]=dep[u]+p.ss; dep1[h]=dep1[u]+1; par[h]=u; dfs(h,u); siz[u]+=siz[h]; } } ll dp[maxn]; ll cntnw=0; ll nchain=1; ll chainhead[maxn]; ll chainid[maxn]; ll id[maxn]; void hld(ll u ) { if (!chainhead[nchain]) chainhead[nchain]=u; cntnw++; chainid[u]=nchain; id[u]=cntnw; ll nxt=-1; for (auto p:adj[u]) { ll to=p.ff; if (to==par[u]) continue; if (nxt==-1||siz[nxt]<siz[to]) { nxt=to; } } if (nxt!=-1) { hld(nxt); } for (auto p:adj[u]) { ll to= p.ff; if (to==par[u]) continue; if (to==nxt) continue; nchain++; hld(to); } } ll get(ll l,ll r,ll x) { return get1(1,1,cntnw,l,r,x); } void dosth(ll u,ll a ,ll x) { ll p=chainid[u]; ll chk= chainid[a]; ll p1=u; dp[p1]=base; while (1) { if (p==chk) { dp[p1]=min(dp[p1],get(id[a],id[u],x)); break; } dp[p1]=min(dp[p1],get(id[chainhead[p]],id[u],x)); u=par[chainhead[p]]; p=chainid[u]; } } ll nxt[maxn]; ll s[maxn]; ll v[maxn]; void dfs1(ll u) { if (u==1) { dp[u]=0; } else { dosth(u,nxt[u],-v[u]); /* if (u==2) { cout <<q[u]+dep[u]*p[u]<<" "<<dp[u]<<endl; }*/ dp[u]=(dp[u]+v[u]*dep[u]+s[u]); } update(1,1,cntnw,dep[u],dp[u],id[u]); // cout <<dp[u]<<" "<<u<<endl; for (auto p:adj[u]) { ll to=p.ff; if (to==par[u]) continue; dfs1(to); } } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); if (fopen("harbingers.in", "r")) { freopen("harbingers.in", "r", stdin); freopen("harbingers.out", "w", stdout); } ll n; cin>>n ; for (int i=1;i<=n-1;i++) { ll x, y, d; cin>> x>> y>> d; adj[x].pb(make_pair(y,d)); adj[y].pb(make_pair(x,d)); } dfs(1,0); hld(1); for (int i=2;i<=n;i++) { nxt[i]=1; cin>>s[i]>>v[i]; } dfs1(1); for (int i=2;i<=n;i++) { cout <<dp[i]<<" "; } }

컴파일 시 표준 에러 (stderr) 메시지

harbingers.cpp: In function 'int main()':
harbingers.cpp:201:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  201 |         freopen("harbingers.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
harbingers.cpp:202:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  202 |         freopen("harbingers.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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