Submission #861050

#	Time	Username	Problem	Language	Result	Execution time	Memory
861050		guagua0407	Two Antennas (JOI19_antennas)	C++17	13 / 100	1530 ms	11092 KiB

antennas

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2005;
multiset<ll> segtree[mxn*4];
ll h[mxn],a[mxn],b[mxn];
int n,q;
ll val;

void update(int pos,int l=1,int r=n,int v=1){
    if(l>r) return;
    segtree[v].insert(h[pos]);
    if(l==r) return;
    int mid=(l+r)/2;
    if(pos<=mid) update(pos,l,mid,v*2);
    else update(pos,mid+1,r,v*2+1);
}

void erase(int pos,int l=1,int r=n,int v=1){
    if(l>r) return;
    segtree[v].erase(segtree[v].find(h[pos]));
    if(l==r) return;
    int mid=(l+r)/2;
    if(pos<=mid) erase(pos,l,mid,v*2);
    else erase(pos,mid+1,r,v*2+1);
}

ll mnquery(int tl,int tr,int l=1,int r=n,int v=1){
    if(r<tl or tr<l){
        return 2e9;
    }
    if(tl<=l and r<=tr){
        return (segtree[v].empty()?(2e9):*segtree[v].begin());
    }
    int mid=(l+r)/2;
    return min(mnquery(tl,min(mid,tr),l,mid,v*2),mnquery(max(tl,mid+1),tr,mid+1,r,v*2+1));
}

ll mxquery(int tl,int tr,int l=1,int r=n,int v=1){
    if(r<tl or tr<l){
        return -2e9;
    }
    if(tl<=l and r<=tr){
        return (segtree[v].empty()?(-2e9):*segtree[v].rbegin());
    }
    int mid=(l+r)/2;
    return max(mxquery(tl,min(mid,tr),l,mid,v*2),mxquery(max(tl,mid+1),tr,mid+1,r,v*2+1));
}


int main() {_
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>h[i]>>a[i]>>b[i];
    }
    cin>>q;
    vector<pair<ll,ll>> R[mxn];
    for(int i=0;i<q;i++){
        ll l,r;
        cin>>l>>r;
        R[r].push_back({i,l});
    }
    vector<ll> output(q);
    for(ll i=1;i<=n;i++){
        for(int j=0;j<mxn*4;j++){
            segtree[j].clear();
        }
        vector<int> st[mxn],en[mxn];
        for(int j=1;j<=i;j++){
            if(j-b[j]+1>i or j-a[j]+1<1) continue;
            //cout<<max(l,j-b[j])<<' '<<min(r,j-a[j])+1<<'\n';
            st[max(1ll,j-b[j])].push_back(j);
            en[min(i,j-a[j])+1].push_back(j);
        }
        vector<ll> rec(mxn);
        for(int j=1;j<=i;j++){
            ll ans=-1;
            for(auto v:st[j]){
                update(v);
            }
            for(auto v:en[j]){
                erase(v);
            }
            rec[j]=-1;
            ll L=j+a[j];
            ll R=j+b[j];
            if(L>i or R<1) continue;
            L=max(L,1ll);
            R=min(R,i);
            val=h[j];
            if(mnquery(L,R)!=2e9) ans=max(ans,abs(h[j]-mnquery(L,R)));
            if(mxquery(L,R)!=-2e9) ans=max(ans,abs(h[j]-mxquery(L,R)));
            rec[j]=ans;
        }
        for(int j=i-1;j>=1;j--){
            rec[j]=max(rec[j],rec[j+1]);
        }
        for(auto v:R[i]){
            output[v.f]=rec[v.s];
        }
    }
    for(int i=0;i<q;i++){
        cout<<output[i]<<'\n';
    }
    return 0;
}
//maybe its multiset not set

Compilation message (stderr)

antennas.cpp: In function 'void setIO(std::string)':
antennas.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 65