Submission #533365

#	Time	Username	Problem	Language	Result	Execution time	Memory
533365		ioi	The Kingdom of JOIOI (JOI17_joioi)	C++14	0 / 100	1 ms	332 KiB

joioi

#include<bits/stdc++.h>

using namespace std;

#define debug(x) cout << '[' << #x << " is: " << x << "] " << endl;
#define inF freopen("6in.txt" , "r" , stdin);
#define outF freopen("6.txt" , "w" , stdout);
#define imod(a , n) (a % n + n ) % n
#define sor(v) sort(v.begin() , v.end());
#define print(v) for(auto f : v ) cout << f << " " ;
#define rsor(v) sort(v.rbegin() , v.rend());
#define rev(v) reverse(v.begin() , v.end());
#define scan(v)for(auto &it : v)cin >> it ;
#define ll long long
#define int ll
#define logar(x , y) log(x) / log(y)
#define __sum(n) n * (n + 1) / 2
#define __lcm(a , b) a / __gcd(a , b) * b
#define pii pair<int , int >
#define fastio ios_base::sync_with_stdio(false);cin.tie(0);
const int N =  2e3 + 5 ,  M = N * 64  , MX = 2e4 + 40;
const ll MOD = 1e9 + 7   , oo = 1e9 + 9 , OO = 1e18 , mod = MOD ;
const double pi = acos(-1) , eps = 1e-17 ;

int di[] = {1 , -1 , 0 , 0};
int dj[] = {0 , 0 , -1 , 1};


set<int> st ;
vector<int> v ;

int n , m ;

int arr[N][N];
int sz ;


bool check(int number){


    int mx = 0 , mn = 1e9 , en = n;


    for(int c = 0 ; c < m ; c ++){
        for(int r = 0 ; r < n ; r ++){
            if(arr[r][c] > number)en = min(r , en) ;

            if(r >= en)mx = max(mx , arr[r][c] ) , mn = min(mn , arr[r][c]);


        }
    }

    return mx-mn <= number - v[0];


}



bool check2(int number){


    int mx = 0 , mn = 1e9 , en = n;


    for(int c = 0 ; c < m ; c ++){
        for(int r = 0 ; r < n ; r ++){
            if(arr[r][c] < number)en = min(r , en) ;

            if(r >= en)mx = max(mx , arr[r][c] ) , mn = min(mn , arr[r][c]);



        }
      //  if(number == 10)debug(arr[0][0])
    }


    return mx-mn <= v.back() - number ;


}

int arr2[N][N];
int32_t main()
{   //inF;
    //inF;outF;
    fastio;


    cin >> n >> m ;



    for(int i = 0 ; i <  n; i ++){
        for(int j = 0 ; j <m; j ++){
            cin >> arr[i][j];
            arr2[i][j] =  arr[i][j];

            st.insert(arr[i][j]);
        }
    }

    for(auto f : st)v.push_back(f);

    sz = v.size();
    ll mnans = 1e10;
    for(int all = 0 ; all < 2 ; all ++){
        int l = 0 , r = sz - 1 , md ;

        int ans  ;


        while(l <= r){


            md = (l + r) / 2 ;

            if(check(v[md]))ans = md , r = md - 1 ;
            else l = md + 1 ;
        }




        for(int i = ans ; i < sz ; i ++){

            mnans = min(mnans , max(v[ans] - v[0] , v.back() - (ans + 1 == sz ? v[ans] : v[ans + 1])));
        }



        //debug(mnans);

         l = 0 , r = sz - 1 , md ;

        while(l <= r){


            md = (l + r) / 2 ;

            // if(all == 0)break;

            if(check2(v[md]))ans = md , l = md + 1 ;
            else r = md - 1 ;
        }


       // debug(ans)


        for(int i = ans ; i >-1 ; i --){

            mnans = min(mnans , max((i == 0 ? v[i] : v[i - 1]) - v[0] , v.back() - v[i]));
        }

        //debug(mnans)


        for(int c = 0 ; c < m ; c ++){

            for(int r = 0 ; r< n ; r ++){
                arr[r][c] = arr2[r][m - 1 - c];
               // debug(arr[r][c])
            }


        }


    }



    cout << mnans ;

}

Compilation message (stderr)

joioi.cpp: In function 'int32_t main()':
joioi.cpp:136:34: warning: right operand of comma operator has no effect [-Wunused-value]
  136 |          l = 0 , r = sz - 1 , md ;
      |                                  ^
joioi.cpp:155:87: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  155 |             mnans = min(mnans , max((i == 0 ? v[i] : v[i - 1]) - v[0] , v.back() - v[i]));
      |                                                                                       ^

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