Submission #143405

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
143405	2019-08-13 23:56:10	osaaateiasavtnl	The Kingdom of JOIOI (JOI17_joioi)	C++14	100 / 100	2584 ms	133528 KiB

joioi

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#include<bits/stdc++.h>
using namespace std;
#define int long long 
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcount
const int N = 2007, INF = 1e9 + 7;
int n, m, mn = INF, a[N][N], r[N];
int suffmn[N][N], suffmx[N][N];
bool check_(int mid) {
    for (int i = 0; i < n; ++i) {
        suffmn[i][m] = INF; for (int j = m - 1; j >= 0; --j) suffmn[i][j] = min(suffmn[i][j + 1], a[i][j]);
        suffmx[i][m] = -INF; for (int j = m - 1; j >= 0; --j) suffmx[i][j] = max(suffmx[i][j + 1], a[i][j]);
    }
    int mx = mn + mid;
    for (int i = 0; i < n; ++i) { r[i] = 0; while (r[i] < m && a[i][r[i]] <= mx) ++r[i]; }   
    int MN, MX, c;
    c = m; MN = INF; MX = -INF;
    for (int i = 0; i < n; ++i) { c = min(c, r[i]); MN = min(MN, suffmn[i][c]); MX = max(MX, suffmx[i][c]); }
    if (MX - MN <= mid) return 1;
    c = m; MN = INF; MX = -INF;
    for (int i = n - 1; i >= 0; --i) { c = min(c, r[i]); MN = min(MN, suffmn[i][c]); MX = max(MX, suffmx[i][c]); }
    if (MX - MN <= mid) return 1;
    return 0;
}
void kek() {
    for (int i = 0; i < n; ++i) for (int j = 0; j < m / 2; ++j) swap(a[i][j], a[i][m - 1 - j]);
}
bool check(int mid) {
    if (check_(mid)) return 1;
 
 
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• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40