Submission #530652

#	Time	Username	Problem	Language	Result	Execution time	Memory
530652		Killer2501	The Kingdom of JOIOI (JOI17_joioi)	C++14	100 / 100	475 ms	16440 KiB

joioi

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 2e3+5;
const int M = 250;
const int mod = 1e9+7;
const ll base = 75;
const int inf = 1e9;
int m, n, t, b[N], d[N], lab[N], c[N];
int k, a[N][N], dp[N], lst[N], fe[N];
ll ans, tong;
vector<int> adj[N], g[N];
vector<int> vi;
string s[N];
bool vis[N];
bool cmp(const int& x, const int& y)
{
    return d[x] > d[y];
}

void add(int id, int x)
{
    for(; id; id -= id & -id)fe[id] += x;
}
int get(int id)
{
    int res = 0;
    for(; id <= m; id += id & -id)res += fe[id];
    return res;
}
struct IT
{
    int n;
    vector<int> st;
    IT(int _n)
    {
        n = _n;
        st.resize(n*4+4, 0);
    }
    void build(int id, int l, int r, int pos, int x)
    {
        if(l == r)
        {
            st[id] = max(x, st[id]);
            return;
        }
        int mid = (l+r)>>1;
        if(pos <= mid)build(id<<1, l, mid, pos, x);
        else build(id<<1|1, mid+1, r, pos, x);
        st[id] = max(st[id<<1], st[id<<1|1]);
    }
    void build(int pos, int x)
    {
        build(1, 1, n, pos, x);
    }
    int get(int id, int l, int r, int u, int v)
    {
        if(u <= l && r <= v)return st[id];
        if(u > r || l > v)return 0;
        int mid = (l+r)>>1;
        return max(get(id<<1, l, mid, u, v), get(id<<1|1, mid+1, r, u, v));
    }
    int get(int l, int r)
    {
        return get(1, 1, n, l, r);
    }
};
int mx, mn = inf;
bool check(int x)
{
    bool ok = true;
    for(int i = 1, p = m; i <= n; i ++)
    {
        for(int j = 1; j <= p; j ++)
        {
            if(mx-a[i][j] > x)
            {
                p = j-1;
                break;
            }
        }
        for(int j = p+1; j <= m; j ++)
        {
            if(a[i][j] - mn > x)
            {
                ok = false;
                break;
            }
        }
    }
    if(ok)return true;
    ok = true;
    for(int i = 1, p = 1; i <= n; i ++)
    {
        for(int j = m; j >= p; j --)
        {
            if(mx-a[i][j] > x)
            {
                p = j+1;
                break;
            }
        }
        for(int j = p-1; j > 0; j --)
        {
            if(a[i][j] - mn > x)
            {
                ok = false;
                break;
            }
        }
    }
    if(ok)return true;
    ok = true;
    for(int i = n, p = m; i > 0; i --)
    {
        for(int j = 1; j <= p; j ++)
        {
            if(mx-a[i][j] > x)
            {
                p = j-1;
                break;
            }
        }
        for(int j = p+1; j <= m; j ++)
        {
            if(a[i][j] - mn > x)
            {
                ok = false;
                break;
            }
        }
    }
    if(ok)return true;
    ok = true;
    for(int i = n, p = 1; i > 0; i --)
    {
        for(int j = m; j >= p; j --)
        {
            if(mx-a[i][j] > x)
            {
                p = j+1;
                break;
            }
        }
        for(int j = p-1; j > 0; j --)
        {
            if(a[i][j] - mn > x)
            {
                ok = false;
                break;
            }
        }
    }
    return ok;
}
void sol()
{
    cin >> n >> m;
    for(int i = 1; i <= n; i ++)
        for(int j = 1; j <= m; j ++)
        {
            cin >> a[i][j];
            mx = max(mx, a[i][j]);
            mn = min(mn, a[i][j]);
        }
    int l = 0, r = 1e9, mid;
    while(l <= r)
    {
        mid = (l+r)>>1;
        if(check(mid))r = mid-1;
        else l = mid+1;

    }
    cout << l;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}

Compilation message (stderr)

joioi.cpp: In function 'int main()':
joioi.cpp:191:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  191 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp:192:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  192 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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