Submission #472711

#TimeUsernameProblemLanguageResultExecution timeMemory
472711HaidaraWall (IOI14_wall)C++17
100 / 100
1155 ms88836 KiB
    #include "wall.h"
    #include<algorithm>
    using namespace std;
    const int maxn=2000001,inf=1e9+7;
    struct segtree
    {
        int mx,mn;
        segtree():mn(0),mx(inf){}
    } st[maxn*4];
    bool add=0;
    void pull(int inx)
    {
        st[inx*2].mn=max(min(st[inx].mx,st[inx*2].mn),st[inx].mn);
        st[inx*2].mx=min(max(st[inx*2].mx,st[inx].mn),st[inx].mx);
        st[inx*2+1].mn=max(min(st[inx*2+1].mn,st[inx].mx),st[inx].mn);
        st[inx*2+1].mx=min(max(st[inx*2+1].mx,st[inx].mn),st[inx].mx);
        st[inx].mn=0;
        st[inx].mx=inf;
    }
    void update(int ul,int ur,int val,int l,int r,int inx=1)
    {
        if(ul<=l&&r<=ur)
        {
            if(add)
            {
                st[inx].mn=max(st[inx].mn,val);
                st[inx].mx=max(st[inx].mn,st[inx].mx);
            }
            else
            {
                st[inx].mx=min(st[inx].mx,val);
                st[inx].mn=min(st[inx].mn,st[inx].mx);
            }
            if(l!=r)
                pull(inx);
            return ;
        }
        if(l>ur||ul>r)
            return ;
        pull(inx);
        int mid=l+(r-l)/2;
        update(ul,ur,val,l,mid,inx*2);
        update(ul,ur,val,mid+1,r,inx*2+1);
    }
    int query(int pos,int l,int r,int inx=1)
    {
        if(l==r)
            return st[inx].mn;
        int mid=l+(r-l)/2;
        pull(inx);
        if(pos<=mid)
            return query(pos,l,mid,inx*2);
        return query(pos,mid+1,r,inx*2+1);
    }
    void buildWall(int n, int k, int op[], int left[], int right[],int height[], int finalHeight[])
    {
        for(int i=0; i<k; i++)
        {
            if(op[i]==1)
                add=1;
            else
                add=0;
            update(left[i]+1,right[i]+1,height[i],1,n);
        }
        for(int i=0; i<n; i++)
            finalHeight[i]=query(i+1,1,n);
    }

Compilation message (stderr)

wall.cpp: In constructor 'segtree::segtree()':
wall.cpp:7:16: warning: 'segtree::mn' will be initialized after [-Wreorder]
    7 |         int mx,mn;
      |                ^~
wall.cpp:7:13: warning:   'int segtree::mx' [-Wreorder]
    7 |         int mx,mn;
      |             ^~
wall.cpp:8:9: warning:   when initialized here [-Wreorder]
    8 |         segtree():mn(0),mx(inf){}
      |         ^~~~~~~
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