Submission #709429

#TimeUsernameProblemLanguageResultExecution timeMemory
709429AntekbBulldozer (JOI17_bulldozer)C++17
80 / 100
1662 ms176384 KiB
#include<bits/stdc++.h> #define st first #define nd second #define mp make_pair #define pb push_back #define pp pop_back #define eb emplace_back #define all(x) x.begin(), x.end() using namespace std; using ll = long long; using ld = long double; using pii = pair<int, int>; using vi = vector<int>; void debug(){cerr<<"\n";} template<typename H, typename... T> void debug(H h, T... t){ cerr<<h; if(sizeof...(t))cerr<<", "; debug(t...); } #define deb(x...) cerr<<#x<<" = ";debug(x); mt19937 rng(chrono::high_resolution_clock().now().time_since_epoch().count()); const int N=(1<<11), INF=1e9+5; int wei[N], gdzie[N], gdzie2[N]; ll val[N+N], pref[N+N], suf[N+N], res[N+N]; vector<pii> V2; ll ans=0; int n; void dodaj(int v, int c){ //deb(v, c); val[v+N]+=c; pref[v+N]=max(val[v+N], 0ll); suf[v+N]=max(val[v+N], 0ll); res[v+N]=max(val[v+N], 0ll); v+=N; v/=2; while(v){ int l=v+v, r=l+1; res[v]=max(res[l], res[r]); pref[v]=max(pref[l], val[l]+pref[r]); suf[v]=max(suf[r], val[r]+suf[l]); val[v]=val[l]+val[r]; res[v]=max(res[v], pref[r]+suf[l]); v/=2; } } ll get_ans(){ /*ll dp=0, res=0; for(int i=n-1; i>=0; i--){ dp=max(dp+val[i+N], 0ll); res=max(res, dp); } deb(res);*/ //deb(res[1]) return res[1]; } /*void zmien(vector<int> V){ /*sort(all(V), [](int a, int b){return gdzie[a]<gdzie[b];}); //assert(V.size()==2); int c=gdzie[V[0]]; ans=max(ans, get_ans()); for(int i=V.size()-1; i>0;i--){ dodaj(c, wei[V[i]]); dodaj(gdzie[V[i]], -wei[V[i]]); } ans=max(ans, get_ans()); for(int i=V.size()-1; i>=0; i--){ if(i<=V.size()-1-i)break; swap(gdzie[V[i]], gdzie[V[V.size()-i-1]]); } reverse(all(V)); for(int i=V.size()-1; i>0;i--){ dodaj(c, -wei[V[i]]); dodaj(gdzie[V[i]], wei[V[i]]); } ans=max(ans, get_ans()); //for(int i=0; i<n; i++)cout<<gdzie[i]<<" ";cout<<"\n"; //assert(abs(gdzie[V[0]]-gdzie[V[1]])==1); //deb(V[0], V[1], gdzie[V[0]], gdzie[V[1]]); ans=max(ans, get_ans()); dodaj(gdzie[V[0]], wei[V[1]]); dodaj(gdzie[V[1]], -wei[V[1]]); ans=max(ans, get_ans()); //deb(val[N], val[N+1], val[N+2], val[N+3]); dodaj(gdzie[V[0]], -wei[V[0]]); dodaj(gdzie[V[1]], wei[V[0]]); swap(gdzie[V[0]], gdzie[V[1]]); ans=max(ans, get_ans()); }*/ vector<int> co[N]; int M[N]; void upd(vector<pii> &V){ //deb(V.size()); vi uzy; for(pii i:V){ //deb(i.st, i.nd); uzy.pb(i.st); uzy.pb(i.nd); M[i.st]=gdzie[i.st]; M[i.nd]=gdzie[i.nd]; } //deb(); sort(uzy.begin(), uzy.end()); uzy.resize(unique(all(uzy))-uzy.begin()); for(pii i:V){ M[i.nd]=min(M[i.nd], gdzie[i.st]); M[i.st]=min(M[i.st], gdzie[i.nd]); } vi waz; for(int i:uzy){ //deb(i); co[M[i]].pb(i); if(M[i]==gdzie[i])waz.pb(M[i]); else { //deb(i, gdzie[i], M[i]); dodaj(gdzie[i], -wei[i]); dodaj(M[i], wei[i]); } } ans=max(ans, get_ans()); for(int i:waz){ for(int j:co[i]){ gdzie[j]=co[i].size()-1+2*i-gdzie[j]; } } for(int i:uzy){ if(M[i]!=gdzie[i]){ dodaj(gdzie[i], wei[i]); dodaj(M[i], -wei[i]); } } ans=max(ans, get_ans()); for(auto i:waz){ co[i].clear(); } } int main(){ cin>>n; V2.resize(n); for(int i=0; i<n; i++)cin>>V2[i].st>>V2[i].nd>>wei[i], gdzie2[i]=i; sort(gdzie2, gdzie2+n, [](int a, int b){if(V2[a].st==V2[b].st)return V2[a].nd>V2[b].nd;return V2[a].st<V2[b].st;}); for(int i=0; i<n; i++)gdzie[gdzie2[i]]=i; for(int i=0; i<n; i++)dodaj(gdzie[i], wei[i]); vector<pair<ld, pii> > V; for(int i=0; i<n; i++){ for(int j=0; j<i; j++){ int x=V2[i].st-V2[j].st, y=V2[i].nd-V2[j].nd; if(x>0)y=-y, x=-x; if(x==0 && y<0)y=-y; ld kat=-atan2(x, y); //deb(kat, x, y, i, j); V.eb(kat, mp(i, j)); } } sort(all(V)); vector<pii> todo; ans=max(ans, get_ans()); for(int i=0; i<V.size(); i++){ todo.pb(V[i].nd); if(i==V.size()-1 || V[i].st!=V[i+1].st){ upd(todo); todo.clear(); } //zmien({V[i].nd.st, V[i].nd.nd}); } cout<<ans; }

Compilation message (stderr)

bulldozer.cpp:58:2: warning: "/*" within comment [-Wcomment]
   58 |  /*sort(all(V), [](int a, int b){return gdzie[a]<gdzie[b];});
      |   
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:158:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long double, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  158 |  for(int i=0; i<V.size(); i++){
      |               ~^~~~~~~~~
bulldozer.cpp:160:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long double, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |   if(i==V.size()-1 || V[i].st!=V[i+1].st){
      |      ~^~~~~~~~~~~~
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