제출 #1049940

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1049940		vjudge1	Art Exhibition (JOI18_art)	C++17	100 / 100	184 ms	28244 KiB

art

#ifdef ONLINE_JUDGE
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#endif
#include <bits/stdc++.h>
#define ll long long int
#define speed ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define TxtIO freopen("lol.in","r",stdin); freopen("lol.txt","w",stdout);
#define forn(i,n) for(int i=0;i<n;i++)
#define pb push_back
using namespace std;

struct segtree{
    vector <ll> tree;
    ll size;
    void init(ll n){
        size=1;
        while(size<n) size*=2;
        tree.assign(2*size-1,-1e18);
    }

    void build(vector <pair<ll,ll>> &a,ll x,ll lx,ll rx){
        if(rx-lx==1){
            if(lx<a.size()) tree[x]=a[lx].second-a[lx].first;
            return;
        }
        else{
            ll m=(lx+rx)/2;
            build(a,x*2+1,lx,m);
            build(a,x*2+2,m,rx);
            tree[x]=max(tree[x*2+1],tree[x*2+2]);
        }
    }

    void build(vector <pair<ll,ll>> &a){
        init(a.size());
        build(a,0,0,size);
    }

    ll maxdo(ll l, ll r, ll x, ll lx, ll rx){
        if(lx>=r || l>=rx) return -1e18;
        if(lx>=l && rx<=r) return tree[x];
        ll m=(lx+rx)/2;
        ll s1=maxdo(l,r,x*2+1,lx,m);
        ll s2=maxdo(l,r,x*2+2,m,rx);
        return max(s1,s2);
    }

    ll maxdo(ll l,ll r){
        return maxdo(l,r,0,0,size);
    }
};

void solve(){
    ll n;
    cin>>n;
    vector <pair<ll,ll>> a(n);
    forn(i,n) cin>>a[i].first>>a[i].second;
    sort(a.begin(),a.end());
    vector <ll> p(n);p[0]=a[0].second;
    for(int i=1;i<n;i++){
        p[i]=p[i-1]+a[i].second;
    }
    vector <pair<ll,ll>> lol(n);
    for(int i=0;i<n;i++){
        lol[i].first=a[i].first;
        lol[i].second=p[i];
    }
    segtree st;
    st.build(lol);
    ll ans=-1e18;
    for(int l=0;l<n;l++){
        ll pl,al=a[l].first;
        if(l==0) pl=0;
        else pl=p[l-1];
        ans=max(ans,st.maxdo(l,n)-pl+al);
    }
    cout<<ans;
}

signed main(){
    speed;
    int t=1;
    while(t--){
        solve();
    }
}

컴파일 시 표준 에러 (stderr) 메시지

art.cpp: In member function 'void segtree::build(std::vector<std::pair<long long int, long long int> >&, long long int, long long int, long long int)':
art.cpp:24:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |             if(lx<a.size()) tree[x]=a[lx].second-a[lx].first;
      |                ~~^~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50