Submission #250456

#	Time	Username	Problem	Language	Result	Execution time	Memory
250456		fivefourthreeone	The Kingdom of JOIOI (JOI17_joioi)	C++17	60 / 100	4059 ms	158948 KiB

joioi

#include <bits/stdc++.h>
#define owo(i,a, b) for(int i=(a); i<(b); ++i)
#define uwu(i,a, b) for(int i=(a)-1; i>=(b); --i)
#define senpai push_back
#define ttgl pair<int, int>
#define ayaya cout<<"ayaya~"<<endl
 
using namespace std;
using ll = long long;
using ld = long double;
const ll MOD = 998244353;
int gcd(int a,int b){return b?gcd(b,a%b):a;}
ll binpow(ll a,ll b){ll res=1;while(b){if(b&1)res=(res*a)%MOD;a=(a*a)%MOD;b>>=1;}return res;}
ll modInv(ll a){return binpow(a, MOD-2);}
const double PI = acos(-1);
const int INF = 0x3f3f3f3f;
const int NINF = 0xc0c0c0c0;
const ll INFLL = 0x3f3f3f3f3f3f3f3f;
const ll NINFLL = 0xc0c0c0c0c0c0c0c0;
const int mxN = 2001;
int comp[mxN*mxN];
int board[mxN][mxN];
int cnt[mxN*mxN];
int save[mxN*mxN];
map<int, int>mp;
set<int> aaa;
int w, h;
int mx = 0;
int mn = INF;
int idx = 0;
bool check(int val) {
    int prev = INF;
    bool ok = true;
    owo(i, 0, h) {
        ok = true;
        int curr = -1;
        owo(j, 0, w) {
            //cout<<i<<" "<<j<<" "<<comp[board[i][j]]<<"\n";
            if(mx-comp[board[i][j]]<=val&&j<=prev) {
                curr = j;
                continue;
            }
            owo(k, j, w) {
                if(comp[board[i][k]]-mn>val) {
                    ok = false;
                    break;
                }
            }
            break;
        }
        if(!ok)break;
        prev = curr;
        if(i==h-1)return true;
    }
    prev = -1;
    owo(i, 0, w) {
        ok = true;
        int curr = INF;
        uwu(j, h, 0) {
            if(mx-comp[board[j][i]]<=val&&j>=prev) {
                curr = j;
                continue;
            }
            uwu(k, j, 0) {
                if(comp[board[k][i]]-mn>val) {
                    ok = false;
                    break;
                }
            }
            break;
        }
        if(!ok)break;
        prev = curr;
        if(i==w-1)return true;
    }
    prev = -1;
    uwu(i, h, 0) {
        ok = true;
        int curr = INF;
        uwu(j, w, 0) {
            if(mx-comp[board[i][j]]<=val&&j>=prev) {
                curr = j;
                continue;
            }
            uwu(k, j, 0) {
                if(comp[board[i][k]]-mn>val) {
                    ok = false;
                    break;
                }
            }
            break;
        }
        if(!ok)break;
        prev = curr;
        if(i==0)return true;
    }
    prev = INF;
    uwu(i, w, 0) {
        ok = true;
        int curr = -1;
        owo(j, 0, h) {
            if(mx-comp[board[j][i]]<=val&&j<=prev) {
                curr = j;
                continue;
            }
            owo(k, j, h) {
                if(comp[board[k][i]]-mn>val) {
                    
                    ok = false;
                    break;
                }
            }
            break;
        }
        if(!ok)break;
        prev = curr;
        if(i==0)return true;
    }
    return false;
}
int main()
{    
    //freopen("exercise.in", "r", stdin);
    //freopen("exercise.out", "w", stdout);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    cin.tie(0)->sync_with_stdio(0);
    cin>>h>>w;
    owo(i, 0, h) {
        owo(j, 0, w) {
            cin>>board[i][j];
            aaa.insert(board[i][j]);
            mx = max(mx, board[i][j]);
            mn = min(mn, board[i][j]);
        }
    }
    auto it = aaa.begin();
    while(it!=aaa.end()) {
        mp[*it] = idx;
        comp[idx] = *it;
        idx++;
        it++;
    }
    owo(i, 0, h) {
        owo(j, 0, w) {
            board[i][j] = mp[board[i][j]];
            save[board[i][j]]++;
        }
    }
    int l = 0;
    int r = mx-mn;
    while(l<r) {
        int mid = (l+r)/2;
        if(check(mid)) {
            r = mid;
        }else{
            l = mid+1;
        }
    }
    cout<<l<<"\n";
    return 0;
}

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