Submission #878442

#	Time	Username	Problem	Language	Result	Execution time	Memory
878442		Husayn	Wall (IOI14_wall)	C++14	100 / 100	565 ms	78004 KiB

wall

#include "wall.h"
#include <bits/stdc++.h>
#define ADD 1
using namespace std;
int const maxn = 1 << 21;
int N;
pair<int, int> t[(maxn << 2) + 9];
void push(int v){
    t[v << 1].first = min(max(t[v << 1].first, t[v].first), t[v].second);
    t[v << 1 | 1].first = min(max(t[v << 1 | 1].first, t[v].first), t[v].second);
    t[v << 1].second = min(max(t[v << 1].second, t[v].first), t[v].second);
	t[v << 1 | 1].second = min(max(t[v << 1 | 1].second, t[v].first), t[v].second);
}
void update(int v, int tl, int tr, int l, int r, int h, int upd){
	if(l <= tl && tr <= r) {
	    if (upd == ADD){
	        t[v].first = max(t[v].first, h);
	        t[v].second = max(t[v].second, h);
		} else{
	        t[v].first = min(t[v].first, h);
	        t[v].second = min(t[v].second, h);
		}
		return;
	}   
	if(l > tr || r < tl)
	    return;
	push(v);
	int tm = tl + tr >> 1;
	update(v << 1, tl, tm, l, r, h, upd);
	update(v << 1 | 1, tm + 1, tr, l, r, h, upd);
	
    t[v].first = min(t[v << 1].first, t[v << 1 | 1].first);
    t[v].second = max(t[v << 1].second, t[v << 1 | 1].second);
}
int res[maxn];
void rebuild(int v, int tl, int tr){
	if (tl == tr){
		res[tl] = t[v].first;
		return;
	}
	push(v);
	int tm = tl + tr >> 1;
	rebuild(v << 1, tl, tm);
	rebuild(v << 1 | 1, tm + 1, tr);
}
 
void buildWall(int n, int k, int op[], int left[], int right[], int height[], int finalHeight[]){
    N = n;
	for (int i = 0; i < k; i++)
	    update(1, 0, maxn, left[i], right[i], height[i], op[i]);
	rebuild(1, 0, maxn);
	for(int i = 0; i < n; i ++)
	    finalHeight[i] = res[i];
	 
}

Compilation message (stderr)

wall.cpp: In function 'void update(int, int, int, int, int, int, int)':
wall.cpp:28:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   28 |  int tm = tl + tr >> 1;
      |           ~~~^~~~
wall.cpp: In function 'void rebuild(int, int, int)':
wall.cpp:42:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   42 |  int tm = tl + tr >> 1;
      |           ~~~^~~~
wall.cpp: In function 'void buildWall(int, int, int*, int*, int*, int*, int*)':
wall.cpp:38:9: warning: array subscript 2097152 is above array bounds of 'int [2097152]' [-Warray-bounds]
   38 |   res[tl] = t[v].first;
      |   ~~~~~~^
wall.cpp:35:5: note: while referencing 'res'
   35 | int res[maxn];
      |     ^~~

• Subtask 1: 8 / 8
• Subtask 2: 24 / 24
• Subtask 3: 29 / 29
• Subtask 4: 39 / 39