Submission #1037278

#TimeUsernameProblemLanguageResultExecution timeMemory
1037278Dan4LifeComparing Plants (IOI20_plants)C++17
27 / 100
314 ms11988 KiB
#include "plants.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a), end(a)
using ar2 = array<int,2>;
const int mxN = (int)2e5+10;
const int INF = (int)1e9;
int n, h[mxN];

template<class T, int SZ> struct SegTree{
	T seg[SZ], lzy[SZ];
	
	void init(){ fill(seg,seg+SZ,0), fill(lzy,lzy+SZ,0); }
	
	void prop(int p, int l, int r){
		if(!lzy[p] or l==r) return;
		int mid = (l+r)/2; int rp = p+2*(mid-l+1);
		seg[p+1]+=lzy[p];
		seg[rp]+=lzy[p];
		lzy[p+1]+=lzy[p];
		lzy[rp]+=lzy[p];
		lzy[p]=0;
	}
	
	void upd(int i, int j, int v, int p=0, int l=0, int r=n-1){
		if(i>r or j<l or i>j) return; 
		if(i<=l and r<=j){ seg[p]+=v; lzy[p]+=v; return; }
		prop(p,l,r);
		int mid = (l+r)/2; int rp = p+2*(mid-l+1);
		if(i<=mid) upd(i,j,v,p+1,l,mid);
		if(j>mid) upd(i,j,v,rp,mid+1,r);
		seg[p] = min(seg[p+1],seg[rp]);
	}
	
	int findFirstMin(int i, int j, int p=0, int l=0, int r=n-1){
		if(i>r or j<l or i>j) return -1; 
		prop(p,l,r);
		if(l==r) return l;
		int mid = (l+r)/2; int rp = p+2*(mid-l+1);
		prop(p+1,l,mid);
		if(seg[p+1]==seg[p]) return findFirstMin(i,j,p+1,l,mid);
		return findFirstMin(i,j,rp,mid+1,r);
	}
	
	T query(int i, int p=0, int l=0, int r=n-1){
		if(i<l or i>r) return INF; prop(p,l,r);
		if(l==r) return seg[p]; 
		int mid = (l+r)/2; int rp = p+2*(mid-l+1);
		if(i<=mid) return query(i,p+1,l,mid);
		return query(i,rp,mid+1,r); 
	}
};
const int mxSeg = 2*mxN;
SegTree<int,mxSeg> segTree;

void init(int k, vector<int> r) {
	n = sz(r); k--; segTree.init();
	for(int i = 0; i < n; i++) segTree.upd(i,i,r[i]);
	for(int _ = n; _ > 0; _--){
		int i = segTree.findFirstMin(0,n-1);
		if(i<k){
			segTree.upd(0,n-k+i-1,mxN);
			int i1 = segTree.findFirstMin(0,n-1);
			bool ok = 0;
			if(i1!=-1 and !segTree.query(i1)) ok=1;
			segTree.upd(0,n-k+i-1,-mxN); 
			if(ok) i=i1;
		}
		if(i>=k) segTree.upd(i-k,i-1,-1);
		else segTree.upd(0,i-1,-1), segTree.upd(n-k+i,n-1,-1);
		segTree.upd(i,i,mxN); h[i]=_;
	}
}

int compare_plants(int x, int y) {
	return h[x]>h[y]?1:-1;
}

Compilation message (stderr)

plants.cpp: In member function 'T SegTree<T, SZ>::query(int, int, int, int)':
plants.cpp:48:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   48 |   if(i<l or i>r) return INF; prop(p,l,r);
      |   ^~
plants.cpp:48:30: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   48 |   if(i<l or i>r) return INF; prop(p,l,r);
      |                              ^~~~
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