제출 #373933

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
373933		rrrr10000	Bulldozer (JOI17_bulldozer)	C++14	0 / 100	4 ms	1000 KiB

bulldozer

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<P,P> PP;
typedef vector<ll> vi;
typedef vector<bool> vb;
typedef vector<vi> vvi;
typedef vector<P> vp;
typedef vector<PP> vpp;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define REP(i,k,n) for(ll i=(ll)(k);i<(ll)(n);i++)
#define all(a) a.begin(),a.end()
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define pb emplace_back
#define fi first
#define se second
template<class T> bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T> void out(T a){cout<<a<<'\n';}
template<class T> void outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<'\n';}
template<class T> void outvp(T v){rep(i,v.size())cout<<'('<<v[i].fi<<','<<v[i].se<<')';cout<<'\n';}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<'\n';}
template<class T> void outvv(T v){rep(i,v.size())outv(v[i]);}
const ll inf=1001001001001001001;
ll gcd(ll a,ll b){
    if(b==0)return a;
    return gcd(b,a%b);
}
class segtree{
    vi seg;ll N=1;
public:
    segtree(vi v){
        while(N<v.size())N*=2;
        seg=vi(N*2-1);
        rep(i,v.size())seg[i+N-1]=v[i];
        for(ll i=N-2;i>=0;i--)seg[i]=max(seg[i*2+1],seg[i*2+2]);
    }
    void add(ll i,ll x){
        i+=N-1;
        seg[i]+=x;
        while(i>0){
            i=(i-1)/2;
            seg[i]=max(seg[i*2+1],seg[i*2+2]);
        }
    }
    ll get(ll a,ll b,ll k=0,ll l=0,ll r=-1){
        if(r==-1)r=N;
        if(a<=l&&r<=b)return seg[k];
        if(r<=a||b<=l)return 0;
        ll c1=get(a,b,k*2+1,l,(l+r)/2);
        ll c2=get(a,b,k*2+2,(l+r)/2,r);
        return max(c1,c2);
    }
    void debug(ll n){
        vi res;
        rep(i,n)res.pb(seg[i+N-1]);
        outv(res);
    }
};
int main(){
    ll n;cin>>n;
    vvi tmp(n,vi(3));
    rep(i,n)rep(j,3)cin>>tmp[i][j];
    sort(all(tmp));
    vp v(n);vi val(n);rep(i,n)v[i]=P(tmp[i][0],tmp[i][1]);rep(i,n)val[i]=tmp[i][2];
    vpp srt;
    rep(i,n)rep(j,i){
        ll a=v[i].fi-v[j].fi,b=v[i].se-v[j].se;
        if(a!=0){
            ll g=gcd(abs(a),abs(b));
            a/=g;b/=g;
            srt.pb(P(a,b),P(j,i));
        }
        else srt.pb(P(1,inf),P(j,i));
    }
    auto cmp=[&](PP a,PP b){
        if(a.fi!=b.fi)return a.fi.se*b.fi.fi<a.fi.fi*b.fi.se;
        return a.se<b.se;
    };
    sort(all(srt),cmp);
    vi ruil=val,ruir=val;
    rep(i,n-1)ruil[i+1]+=ruil[i];
    for(int i=n-1;i>0;i--)ruir[i-1]+=ruir[i];
    segtree segl(ruil),segr(ruir);
    ll ans=0;
    for(ll x:val)chmax(ans,x);
    ll l=0;
    vi num(n),mun(n);
    rep(i,n)num[i]=mun[i]=i;
    while(l<srt.size()){
        ll r=l;
        while(r+1<srt.size()&&srt[l].fi==srt[r+1].fi)r++;
        REP(i,l,r+1){
            ll a=srt[i].se.fi,b=srt[i].se.se;
            chmax(ans,segr.get(0,mun[a])-segr.get(mun[b]+1,mun[b]+2));
            chmax(ans,segl.get(mun[b]+1,n)-segl.get(mun[a]-1,mun[a]));
            chmax(ans,val[a]+val[b]);
        }
        REP(i,l,r+1){
            ll a=srt[i].se.fi,b=srt[i].se.se;
            ll A=mun[a],B=mun[b];
            if(A>B){
                assert(false);
                swap(a,b);swap(A,B);
            }
            assert(B-A==1);
            swap(num[A],num[B]);
            swap(mun[a],mun[b]);
            segl.add(A,val[b]-val[a]);
            segr.add(B,val[a]-val[b]);
        }
        assert(l==r);
        // outp(srt[l].se);
        // out(ans);
        // segl.debug(n);
        // segr.debug(n);
        l=r+1;
    }
    // outvp(v);outv(val);
    out(ans);
}

컴파일 시 표준 에러 (stderr) 메시지

bulldozer.cpp: In constructor 'segtree::segtree(vi)':
bulldozer.cpp:34:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |         while(N<v.size())N*=2;
      |               ~^~~~~~~~~
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:91:12: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<std::pair<long long int, long long int>, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |     while(l<srt.size()){
      |           ~^~~~~~~~~~~
bulldozer.cpp:93:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<std::pair<long long int, long long int>, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |         while(r+1<srt.size()&&srt[l].fi==srt[r+1].fi)r++;
      |               ~~~^~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 20
• Subtask 3: 0 / 35
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20