Submission #1109354

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109354		mariaclara	The Kingdom of JOIOI (JOI17_joioi)	C++17	0 / 100	1 ms	2384 KiB

joioi

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef tuple<ll,ll,ll> trio;
typedef pair<int,int> pii;
const int MAXN = 2e5+5;
const ll INF = 1e9;
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mk make_pair
#define pb push_back
#define fr first
#define sc second

int n, m, max_val, min_val = 1e9, v[2005][2005], color[2005][2005];

bool check(int dif) {
    int a = 0, b = 0, c = 0, d = -1;

    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= m; j++) {
            color[i][j] = 0;
            if(max_val - dif >= v[i][j]) color[i][j] = 1;
            if(min_val + dif <= v[i][j]) {
                if(color[i][j] == 1) return 0;
                color[i][j] = -1;
            }
        }
    }

    for(int i = 1; i <= n; i++) {
        for(int j = 1, last = 0, cnt = 0; j <= m; j++) {
            if(color[i][j] == 0) continue;
            cnt += (last != color[i][j]);
            last = color[i][j];
            if(cnt > 2) return 0;
        }
    }

    for(int j = 1; j <= m; j++) {
        for(int i = 1, last = 0, cnt = 0; i <= n; i++) {
            if(color[i][j] == 0) continue;
            cnt += (last != color[i][j]);
            last = color[i][j];
            if(cnt > 2) return 0;
        }
    }

    return 1;
}

int busca() {
    int l = 1, r = max_val - min_val;
    while(l <= r) {
        int mid = (l+r)/2;
        if(check(mid)) r = mid-1;
        else l = mid+1;
    }
    return r;
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m;

    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= m; j++) {
            cin >> v[i][j];
            min_val = min(min_val, v[i][j]);
            max_val = max(max_val, v[i][j]);
        }
    }

    //cout << check(12) << "\n";
    cout << busca();
}

Compilation message (stderr)

joioi.cpp: In function 'bool check(int)':
joioi.cpp:20:9: warning: unused variable 'a' [-Wunused-variable]
   20 |     int a = 0, b = 0, c = 0, d = -1;
      |         ^
joioi.cpp:20:16: warning: unused variable 'b' [-Wunused-variable]
   20 |     int a = 0, b = 0, c = 0, d = -1;
      |                ^
joioi.cpp:20:23: warning: unused variable 'c' [-Wunused-variable]
   20 |     int a = 0, b = 0, c = 0, d = -1;
      |                       ^
joioi.cpp:20:30: warning: unused variable 'd' [-Wunused-variable]
   20 |     int a = 0, b = 0, c = 0, d = -1;
      |                              ^

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