Submission #902629

#	Time	Username	Problem	Language	Result	Execution time	Memory
902629		Maite_Morale	The Kingdom of JOIOI (JOI17_joioi)	C++14	60 / 100	2643 ms	262144 KiB

joioi

#include<bits/stdc++.h>
#define F first
#define S second
#define MAX 3000
#define oo 1e18
#define mod 1000000007
#define fast_in ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);cout.setf(ios::fixed);cout.precision(0);
using namespace std;
typedef long long ll;
#define pll pair<ll , ll>
#define vll vector<ll>
#define vvll vector<vll>
#define vpll vector<pll>
 
ll tmn[5][MAX][MAX]={},tmx[5][MAX][MAX]={},a[MAX][MAX]={},m,n,c=0;
ll v[5000006];map<ll,ll> mp;
ll OK(ll x,ll z){
    ll cl=-1,mx=0,mn=oo;
    for(int i=0;i<n;i++){
        while(cl+1<m && tmn[0][i][cl+1]<x)cl++;
        if(cl!=-1)mx=max(mx,tmx[1][i][cl]);
    }
    mn=min(mn,mx);cl=m;mx=0;
    for(int i=0;i<n;i++){
        while(cl-1>=0 && tmn[1][i][cl-1]<x)cl--;
        mx=max(mx,tmx[0][i][cl]);
    }
    mn=min(mn,mx);cl=-1;mx=0;
    for(int i=n-1;i>=0;i--){
        while(cl+1<m && tmn[0][i][cl+1]<x)cl++;
        if(cl!=-1)mx=max(mx,tmx[1][i][cl]);
    }
    mn=min(mn,mx);cl=m;mx=0;
    for(int i=n-1;i>=0;i--){
        while(cl-1>=0 && tmn[1][i][cl-1]<x)cl--;
        mx=max(mx,tmx[0][i][cl]);
    }
    mn=min(mn,mx);
    if(z==1)return max(abs(v[0]-mn),abs(v[c-1]-x));
    if(abs(v[0]-mn)<=abs(v[c-1]-x))return 1;
return 0; 
}
int main(){
    fast_in
    cin>>n>>m;
    for(int i=0;i<n;i++){
        tmn[0][i][m]=tmn[1][i][0]=oo;
        tmx[0][i][m]=tmx[1][i][0]=0;
        for(int j=0;j<m;j++){
            cin>>a[i][j];
            if(mp[a[i][j]]==0){
                mp[a[i][j]]=1;
                v[c]=a[i][j];
                c++;
            }
            tmx[1][i][j]=max(tmx[1][i][j],a[i][j]);
            tmx[1][i][j+1]=tmx[1][i][j];
            tmn[1][i][j]=min(tmn[1][i][j],a[i][j]);
            tmn[1][i][j+1]=tmn[1][i][j];
        }
        for(int j=m-1;j>=0;j--){
            tmx[0][i][j]=max(tmx[0][i][j+1],a[i][j]);
            tmn[0][i][j]=min(tmn[0][i][j+1],a[i][j]);
        }
    }
    sort(v,v+c);
    if(c==1){cout<<0;return 0;}
    ll p=1,f=c;
    while(abs(f-p)!=1){
        ll md=(p+f)/2;     
        if(md<0 || md>=c)while(true){md=md;}                
        if(OK(v[md],0)==1)p=md;
        else             f=md;           
    }                                          
    if(f==c){cout<<OK(v[p],1);return 0;}
    cout<<min(OK(v[p],1),OK(v[f],1));
return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 0 / 40