Submission #758412

#	Time	Username	Problem	Language	Result	Execution time	Memory
758412		Dan4Life	Wall (IOI14_wall)	C++17	100 / 100	1004 ms	75864 KiB

wall

#include <bits/stdc++.h>
using namespace std;
const int mxN = (int)2e6+10;
int n, k, a[mxN];
array<int,2> seg[mxN*2],Init{0,mxN};
//maximize then minimize
void prop(int p, int l, int r){
    if(l==r or seg[p]==Init) return;
    int mid = (l+r)/2; int rp = p+2*(mid-l+1);
    for(int i : {0,1}){
        seg[p+1][i] = min(max(seg[p+1][i],seg[p][0]),seg[p][1]);
        seg[rp][i] = min(max(seg[rp][i],seg[p][0]),seg[p][1]);
    }
    seg[p]=Init;
}

void upd(int i, int j, int lv, int rv, int p=0, int l=0, int r=n-1){
    if(i>r or j<l or i>j) return; prop(p,l,r);
    int mid = (l+r)/2; int rp = p+2*(mid-l+1);
    if(i<=l and r<=j){ 
        for(int k : {0,1}) 
          seg[p][k] = min(max(seg[p][k],lv),rv);
        return; 
    }
    upd(i,j,lv,rv,p+1,l,mid), upd(i,j,lv,rv,rp,mid+1,r);
}

void query(int p=0, int l=0, int r=n-1){
    if(l==r){ a[l]=min(seg[p][0],seg[p][1]); return; } prop(p,l,r);
    int mid = (l+r)/2; int rp = p+2*(mid-l+1);
    query(p+1,l,mid), query(rp,mid+1,r);
}

void buildWall(int N, int k, int o[], int l[], int r[], int h[], int ans[]){
    n = N;
    for(int i = 0; i <= 2*n; i++) seg[i]=Init;
    for(int i = 0; i < k; i++) upd(l[i],r[i],o[i]==1?h[i]:0,o[i]==1?mxN:h[i]);
    query(); for(int i = 0; i < n; i++) ans[i]=a[i];
}

Compilation message (stderr)

wall.cpp: In function 'void upd(int, int, int, int, int, int, int)':
wall.cpp:18:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   18 |     if(i>r or j<l or i>j) return; prop(p,l,r);
      |     ^~
wall.cpp:18:35: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   18 |     if(i>r or j<l or i>j) return; prop(p,l,r);
      |                                   ^~~~

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