Submission #1023136

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023136		vjudge1	The Kingdom of JOIOI (JOI17_joioi)	C++17	15 / 100	4046 ms	5464 KiB

joioi

#include <bits/stdc++.h>
#include <algorithm>
#include <iostream>
#include <string>
using namespace std;
#define FOR(i,n) for(int i=0;i<n;i++)
#define ROF(i,m,n) for(int i=m;i<=n;i++)
#define vi vector<int>
#define pb push_back
#define alle(a) a.begin(),a.end()
#define rall(n) rbegin(n),rend(n)
#define int long long
#define vecs vector<int> 
#define ll long long
#define ss second 
#define ff first
const int INF = 1e9 + 1;
const int MOD = 1e9 + 7;
const int N = 2005;
int color1[N][N],color2[N][N], color3[N][N] ,color4[N][N];


void solve(){
    int n , m;
    cin>>n>>m;
    vector <vector<int>> a(n,vector <int> (m));
    int mx = 0;
    int mn = INF;
    int ans = 0;
    for(int i = 0;i < n;i++){
        for(int j = 0;j < m;j++){
            cin>>a[i][j];
            mx = max(mx,a[i][j]);
            mn = min(mn,a[i][j]);

        }
    }
    auto check = [&](int m1){
        for(int i = 0;i < n;i++){
            for(int j = 0;j < m;j++){
                if(abs(a[i][j] - mx) <= m1){
                    if(abs(a[i][j] - mn) <= m1){
                        color1[i][j] = 3;
                        color2[i][j] = 3;
                        color3[i][j] = 3;
                        color4[i][j] = 3;
                    }
                    else{
                        color1[i][j] = 1;
                        color2[i][j] = 1;
                        color3[i][j] = 1;
                        color4[i][j] = 1;
                    }
                    
                }
                else if(abs(a[i][j] - mn) <= m1){
                    color1[i][j] = 2;
                    color2[i][j] = 2;
                    color3[i][j] = 2;
                    color4[i][j] = 2;
                }
                else{
                    return false;
                }
            }
        }

        if(color1[0][0] == 1||color1[0][0] == 3){
            for(int i =0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color1[i][j] == 1){
                        for(int q = i;q >= 0;q--){
                            for(int p = j;p >= 0;p--){
                                color1[q][p] = 1;
                            }
                        }

                    }
                }
            }
            int mx1 = 0, mn1 =INF, mx2 = 0,mn2 = INF;
            for(int i = 0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color1[i][j] == 3){
                        color1[i][j] = 2;
                    }
                    if(color1[i][j] == 1){
                        mx1 = max(mx1,a[i][j]);
                        mn1 = min(mn1,a[i][j]);
                    }
                    else if(color1[i][j] == 2){
                        mx2 = max(mx2,a[i][j]);
                        mn2 = min(mn2,a[i][j]);
                    }
                }
            }
            if((mx1 - mn1 <= m1) && (mx2 - mn2 <= m1)){
                return true;
            }
        }
        if(color2[0][m - 1] == 1||color2[0][m - 1] == 3){
            for(int i =0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color2[i][j] == 1){
                        for(int q = i;q >= 0;q--){
                            for(int p = j;p < m;p++){
                                color2[q][p] = 1;
                            }
                        }
                    }
                }
            }
            int mx1 = 0, mn1 =INF, mx2 = 0,mn2 = INF;
            for(int i = 0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color2[i][j] == 3){
                        color2[i][j] = 2;
                    }
                    if(color2[i][j] == 1){
                        mx1 = max(mx1,a[i][j]);
                        mn1 = min(mn1,a[i][j]);
                    }
                    else if(color2[i][j] == 2){
                        mx2 = max(mx2,a[i][j]);
                        mn2 = min(mn2,a[i][j]);
                    }
                }
            }
            if((mx1 - mn1 <= m1) && (mx2 - mn2 <= m1)){
                return true;
            }
        }
        if(color3[n - 1][0] == 1||color3[n - 1][0] == 3){
            for(int i =0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color3[i][j] == 1){
                        for(int q = i;q < n;q++){
                            for(int p = j;p >= 0;p--){
                                color3[q][p] = 1;
                            }
                        }
                    }
                }
            }
            int mx1 = 0, mn1 =INF, mx2 = 0,mn2 = INF;
            for(int i = 0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color3[i][j] == 3){
                        color3[i][j] = 2;
                    }
                    if(color3[i][j] == 1){
                        mx1 = max(mx1,a[i][j]);
                        mn1 = min(mn1,a[i][j]);
                    }
                    else if(color3[i][j] == 2){
                        mx2 = max(mx2,a[i][j]);
                        mn2 = min(mn2,a[i][j]);
                    }
                }
            }
            if((mx1 - mn1 <= m1) && (mx2 - mn2 <= m1)){
                return true;
            }
        }
        if(color4[n - 1][m - 1] == 1||color4[n - 1][m - 1] == 3){
            for(int i =0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color4[i][j] == 1){
                        for(int q = i;q < n;q++){
                            for(int p = j;p < m;p++){
                                color4[q][p] = 1;
                            }
                        }
                    }
                }
            }
            int mx1 = 0, mn1 =INF, mx2 = 0,mn2 = INF;
            for(int i = 0;i < n;i++){
                for(int j = 0;j < m;j++){
                    if(color4[i][j] == 3){
                        color4[i][j] = 2;
                    }
                    if(color4[i][j] == 1){
                        mx1 = max(mx1,a[i][j]);
                        mn1 = min(mn1,a[i][j]);
                    }
                    else if(color4[i][j] == 2){
                        mx2 = max(mx2,a[i][j]);
                        mn2 = min(mn2,a[i][j]);
                    }
                }
            }
            if((mx1 - mn1 <= m1) && (mx2 - mn2 <= m1)){
                return true;
            }
        }
        return false;
    };
    int l = 0,r = mx - mn;
    while(1 < r - l){
        int m2 = (l + r) >> 1;
        if(check(m2)){
            r = m2;
        }
        else{
            l = m2;
        }
    }
    if(check(l)){
        cout<<l;
    }
    else{
        cout<<r;
    }
}
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    int t = 1;
    while (t--) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

joioi.cpp: In function 'void solve()':
joioi.cpp:29:9: warning: unused variable 'ans' [-Wunused-variable]
   29 |     int ans = 0;
      |         ^~~

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