Submission #330322

#	Time	Username	Problem	Language	Result	Execution time	Memory
330322		errorgorn	조화행렬 (KOI18_matrix)	C++17	100 / 100	2852 ms	306112 KiB

matrix

//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
//change less to less_equal for non distinct pbds, but erase will bug

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n,m;
int arr[200005][3];
int proc[200005];

struct node{
	int s,e,m;
	set<ii> st;
	node *l,*r;
	
	node (int _s,int _e){
		s=_s,e=_e,m=s+e>>1;
		st.insert(ii(-1,0));
		
		if (s!=e){
			l=new node(s,m);
			r=new node(m+1,e);
		}
	}
	
	void update(int i,ii val){
		auto it=st.insert(val).fi;
		
		if ((*prev(it)).se>=val.se){
			st.erase(it);
		}
		else{
			while (next(it)!=st.end() && (*next(it)).se<=val.se){
				st.erase(next(it));
			}
		}
		
		if (s==e) return;
		if (i<=m) l->update(i,val);
		else r->update(i,val);
	}
	
	int query(int i,int j,int k){
		if (s==i && e==j){
			return (*--st.upper_bound(ii(k,-1))).se;
		}
		else if (j<=m) return l->query(i,j,k);
		else if (m<i) return r->query(i,j,k);
		else return max(l->query(i,m,k),r->query(m+1,j,k));
	}
} *root=new node(0,200005);

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin.exceptions(ios::badbit | ios::failbit);
	
	cin>>n>>m;
	
	rep(x,0,n){
		rep(y,0,m){
			cin>>arr[y][x];
		}
	}
	rep(y,0,m) proc[y]=y;
	
	sort(proc,proc+m,[](int i,int j){
		return arr[i][0]<arr[j][0];
	});
	
	rep(x,1,3){
		vector<int> temp;
		rep(y,0,m) temp.push_back(arr[y][x]);
		sort(all(temp));
		map<int,int> id;
		rep(y,0,m) id[temp[y]]=y+1;
		rep(y,0,m) arr[y][x]=id[arr[y][x]];
	}
	
	rep(x,0,m){
		int a=arr[proc[x]][1],b=(n==2?x:arr[proc[x]][2]);
		//cout<<a<<" "<<b<<endl;
		root->update(a,ii(b,root->query(0,a-1,b)+1));
	}
	
	cout<<root->query(0,200005,1e9);
}

Compilation message (stderr)

matrix.cpp: In constructor 'node::node(int, int)':
matrix.cpp:38:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   38 |   s=_s,e=_e,m=s+e>>1;
      |               ~^~

• Subtask 1: 14 / 14
• Subtask 2: 9 / 9
• Subtask 3: 15 / 15
• Subtask 4: 62 / 62