Submission #1097847

#TimeUsernameProblemLanguageResultExecution timeMemory
1097847esomerWall (IOI14_wall)C++17
100 / 100
706 ms59420 KiB
#include<bits/stdc++.h>
 
using namespace std;
 
struct segTree{
	vector<pair<int, int>> v;
	int siz;
	void init(int n){
		siz = 1;
		while(siz < n) siz *= 2;
		v.assign(2 * siz, {0, 0});
	}
	void push(int x){
		v[2 * x + 1].first = min(max(v[2 * x + 1].first, v[x].first), v[x].second);
		v[2 * x + 1].second = max(min(v[2 * x + 1].second, v[x].second), v[x].first);
		v[2 * x + 2].first = min(max(v[2 * x + 2].first, v[x].first), v[x].second);
		v[2 * x + 2].second = max(min(v[2 * x + 2].second, v[x].second), v[x].first);
	}
	void set(int l, int r, int x, int lx, int rx, int h, int t){
		if(lx >= l && rx <= r){
			if(t == 1){
				v[x].first = max(v[x].first, h);
				v[x].second = max(v[x].second, v[x].first);
			}else{
				v[x].second = min(v[x].second, h);
				v[x].first = min(v[x].first, v[x].second);
			}
			return;
		}else if(lx >= r || rx <= l) return;
		push(x);
		v[x] = {0, 100000};
		int m = (lx + rx) / 2;
		set(l, r, 2 * x + 1, lx, m, h, t);
		set(l, r, 2 * x + 2, m, rx, h, t);
	}
	void set(int l, int r, int h, int t){
		set(l, r, 0, 0, siz, h, t);
	}
	int calc(int i, int x, int lx, int rx){
		if(rx - lx == 1){
			return v[x].first;
		}
		push(x);
		v[x] = {0, 100000};
		int m = (lx + rx) / 2;
		if(i < m) return calc(i, 2 * x + 1, lx, m);
		else return calc(i, 2 * x + 2, m, rx);
	}
	int calc(int i){
		return calc(i, 0, 0, siz);
	}
};
 
void buildWall(int n, int k, int* op, int* left, int* right, int* height, int* finalHeight){
	segTree st; st.init(n);
	for(int i = 0; i < k; i++){
		st.set(left[i], right[i] + 1, height[i], op[i]);
	}
	for(int i = 0; i < n; i++){
		finalHeight[i] = st.calc(i);
	}
}
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