Submission #942885

#	Time	Username	Problem	Language	Result	Execution time	Memory
942885		guagua0407	Sweeping (JOI20_sweeping)	C++17	11 / 100	2540 ms	207452 KiB

sweeping

//#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);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

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

struct qry{
    int t,a,b;
};

const int mxn=2e6+5;
const int inf=1e9+5;
int x[mxn],y[mxn];
int prv[mxn];
set<pair<int,int>> X,Y;
vector<vector<int>> segtree(2,vector<int>(mxn*4,-1));
vector<vector<int>> lazy(2,vector<int>(mxn*4,-1));
map<int,int> usedX,usedY;
int n,m,q;

void push(int id,int v){
    if(lazy[id][v]==-1) return;
    segtree[id][v*2]=max(segtree[id][v*2],lazy[id][v]);
    segtree[id][v*2+1]=max(segtree[id][v*2+1],lazy[id][v]);
    lazy[id][v*2]=max(lazy[id][v*2],lazy[id][v]);
    lazy[id][v*2+1]=max(lazy[id][v*2+1],lazy[id][v]);
    lazy[id][v]=-1;
}

void update(int id,int tl,int tr,int val,int l=1,int r=m,int v=1){
    if(r<tl or tr<l){
        return;
    }
    if(tl<=l and r<=tr){
        segtree[id][v]=max(segtree[id][v],val);
        lazy[id][v]=max(lazy[id][v],val);
        return;
    }
    push(id,v);
    int mid=(l+r)/2;
    update(id,tl,min(mid,tr),val,l,mid,v*2);
    update(id,max(mid+1,tl),tr,val,mid+1,r,v*2+1);
    segtree[id][v]=max(segtree[id][v*2],segtree[id][v*2+1]);
}

int query(int id,int pos,int l=1,int r=m,int v=1){
    if(l==r){
        return segtree[id][v];
    }
    push(id,v);
    int mid=(l+r)/2;
    if(pos<=mid) return query(id,pos,l,mid,v*2);
    else return query(id,pos,mid+1,r,v*2+1);
}


int main() {_
    cin>>n>>m>>q;
    for(int i=1;i<=m;i++){
        cin>>x[i]>>y[i];
        update(0,i,i,x[i]);
        update(1,i,i,y[i]);
    }
    //cout<<'\n';
    for(int i=0;i<q;i++){
        int t,v;
        cin>>t>>v;
        if(t==1){
            cout<<query(0,v)<<' '<<query(1,v)<<'\n';
        }
        else if(t==2){
            if(usedY.find(v)!=usedY.end()) continue;
            int ind=lower_bound(y+1,y+m+1,v,greater<int>())-y;
            auto it=Y.lower_bound({n-v,-inf});
            if(it!=Y.begin() and !Y.empty()){
                it=prev(it);
                ind=max(ind,(*it).s+1);
            }
            if(ind<=m) update(0,ind,m,n-v);
            X.insert({v,ind});
            usedY[v]++;
        }
        else{
            if(usedX.find(v)!=usedX.end()) continue;
            int ind=upper_bound(x+1,x+m+1,v)-x-1;
            auto it=X.lower_bound({n-v,-inf});
            if(it!=X.begin() and !X.empty()){
                it=prev(it);
                ind=min(ind,(*it).s-1);
            }
            if(1<=inf) update(1,1,ind,n-v);
            Y.insert({v,ind});
            usedX[v]++;
        }
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

sweeping.cpp: In function 'void setIO(std::string)':
sweeping.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sweeping.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 10
• Subtask 3: 11 / 11
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25