Submission #377956

#	Time	Username	Problem	Language	Result	Execution time	Memory
377956		cpp219	Art Exhibition (JOI18_art)	C++14	100 / 100	695 ms	32108 KiB

art

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 5e5 + 9;
const ll inf = 1e9 + 7;

ll n,st[4*N],lazy[4*N];
LL a[N];

void Pass(ll id){
    ll t = lazy[id]; lazy[id] = 0;
    st[id*2] += t; lazy[id*2] += t;
    st[id*2 + 1] += t; lazy[id*2 + 1] += t;
}

void upd(ll id,ll l,ll r,ll u,ll v,ll val){
    if (v < l||r < u) return;
    if (u <= l&&r <= v){
        st[id] += val; lazy[id] += val; return;
    }
    ll mid = (l + r)/2; Pass(id);
    upd(id*2,l,mid,u,v,val); upd(id*2 + 1,mid + 1,r,u,v,val);
    st[id] = max(st[id*2],st[id*2 + 1]);
}

ll Get(ll id,ll l,ll r,ll u,ll v){
    if (v < l||r < u) return 0;
    if (u <= l&&r <= v) return st[id];
    ll mid = (l + r)/2; Pass(id);
    return max(Get(id*2,l,mid,u,v),Get(id*2 + 1,mid + 1,r,u,v));
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    cin>>n;
    for (ll i = 1;i <= n;i++) cin>>a[i].fs>>a[i].sc;
    sort(a + 1,a + n + 1);
    ll cur = 0,ans = 0;
    for (ll i = 1;i <= n;i++){
        cur += a[i].sc;
        upd(1,1,n,i,i,cur - a[i].fs + a[1].fs);
    }
    ans = max(ans,Get(1,1,n,1,n)); //cout<<ans; return 0;
    for (ll i = 2;i <= n;i++){
        upd(1,1,n,i,n,a[i].fs - a[i - 1].fs - a[i - 1].sc);
        ans = max(ans,Get(1,1,n,i,n)); //cout<<Get(1,1,n,i,n)<<"x\n";
    }
    cout<<ans;
}

Compilation message (stderr)

art.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
art.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      | 
art.cpp: In function 'int main()':
art.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   46 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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