Submission #934808

#	Time	Username	Problem	Language	Result	Execution time	Memory
934808		Whisper	The Kingdom of JOIOI (JOI17_joioi)	C++17	100 / 100	1931 ms	102188 KiB

joioi

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define pii pair<int , int>
#define Lg(x) 31 - __builtin_clz(x)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)

constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int MAX = 2e3 + 5;
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void setupIO(){
    #define name "Whisper"
    //Phu Trong from Nguyen Tat Thanh High School for gifted student
    srand(time(NULL));
    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    cout << fixed << setprecision(10);
}

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
int nCol, nRow;
int a[MAX][MAX], b[MAX][MAX];
void print(){
    FOR(i, 1, nRow) FOR(j, 1, nCol) cout << a[i][j] << " \n"[j == nCol];
}
void rot(){
    //table rotation
    for (int i = 1; i <= nRow; ++i){
        for (int j = 1; j <= nCol; ++j){
            b[j][nRow + 1 - i] = a[i][j];
        }
    }
    swap(nRow, nCol);
    FOR(i, 1, nRow) FOR(j, 1, nCol) a[i][j] = b[i][j];
}
int mn = INF;
void Whisper(){
    cin >> nRow >> nCol;
    FOR(i, 1, nRow) FOR(j, 1, nCol){
        cin >> a[i][j]; minimize(mn, a[i][j]);
    }
    int l = 0, r = 1e9;
    int ans = -1;
//
    auto check = [&](int v){
        for (int dir = 0; dir < 4; ++dir){
            int lst = nCol, mnVal = INF, mxVal = 0;
            for (int i = 1; i <= nRow; ++i){
                for (int j = 1; j <= lst; ++j){
                    if (a[i][j] - mn > v){
                        lst = j - 1; break;
                    }
                }
                for (int j = lst + 1; j <= nCol; ++j){
                    maximize(mxVal, a[i][j]);
                    minimize(mnVal, a[i][j]);
                }
            }
            if(mxVal - mnVal <= v) return 1;
            if (dir < 3) rot();
        }
        return 0;
    };
    while (l <= r){
        int mid = (l + r) >> 1;
        if (check(mid)) r = mid - 1, ans = mid;
        else l = mid + 1;
    }
    cout << ans;
}


signed main(){
    setupIO();
    int Test = 1;
//    cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

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