oj.uz

답안 #46734

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
46734 2018-04-22T16:09:41 Z kuzmichev_dima The Kingdom of JOIOI (JOI17_joioi) C++14
60 / 100
 4000 ms 153296 KB 
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
#include <iostream>
#include <cassert>
#include <cmath>
#include <string>
#include <queue>
#include <set>
#include <map>
#include <cstdlib>
#include <unordered_set>
 
using namespace std;
 
#define INF 1e+9
#define mp make_pair
#define pb push_back
#define fi first
#define fs first
#define se second
#define i64 long long
#define li long long
#define lint long long
#define pii pair<int, int>
#define vi vector<int>
 
#define forn(i, n) for (int i = 0; i < (int)n; i++)
#define fore(i, b, e) for (int i = (int)b; i <= (int)e; i++)
 
const int maxn = 2005;
const int inf = 1e9+7;
 
pii prec[maxn][maxn];
int n, m;
int a[maxn][maxn];
int b[maxn][maxn];
int global_min, global_max;
vi pos_min;
//unordered_set<int> possible_min;
 
struct Event {
    int minn, row, diff;
};
 
bool operator < (Event fi, Event se) {
    return fi.minn < se.minn;
}
 
inline bool check(int delta) {
    //fprintf(stderr, "check %d\n", delta);
    vector<Event> events;
    vi app_limits(m, -inf);
    vi dis_limits(m, inf);
    forn(i, n) {
        int cur_app = -inf;
        int cur_dis = inf;
        forn(j, m) {
            //min <= x <= min + delta
            cur_app = max(cur_app, a[i][j] - delta);
            cur_app = max(cur_app, app_limits[j]);
            app_limits[j] = cur_app;
 
            cur_dis = min(cur_dis, a[i][j] + 1);
            cur_dis = min(cur_dis, dis_limits[j]);
            dis_limits[j] = cur_dis;
            if (cur_app < cur_dis) {
                events.pb({cur_app, i, +1});
                events.pb({cur_dis, i, -1});
            }
        }
    }
    sort(events.begin(), events.end());
    /*for (auto e : events) {
        fprintf(stderr, "event minn = %d row = %d diff = %d\n", e.minn, e.row, e.diff);
    }*/
    size_t pointer = 0;
    vi rows(n);
    while(pointer < events.size()) {
        int minn = events[pointer].minn;
        while(pointer < events.size() && events[pointer].minn == minn) {
            rows[events[pointer].row] += events[pointer].diff;
            pointer++;
        }
        if (pointer < events.size()) {
            if (lower_bound(pos_min.begin(), pos_min.end(), minn) == lower_bound(pos_min.begin(), pos_min.end(), events[pointer].minn))
                continue;
        }
        //if (possible_min.find(minn) == possible_min.end())
        //    continue;
        /*printf("minn = %d\n", minn);
        forn(i, n)
            printf("rows[%d] = %d\n", i, rows[i]);*/
        int len = rows[0];
        int right_min = inf;
        int right_max = -inf;
        forn(row, n) {
            len = min(len, rows[row]);
            right_min = min(right_min, prec[row][len].fi);
            right_max = max(right_max, prec[row][len].se);
            if (right_max - right_min > delta)
                break;
        }
        //fprintf(stderr, "right min = %d max = %d\n", right_min, right_max);
        if (right_max - right_min <= delta)
            return true;
    }
    return false;
}
 
int solve(int upper) {
    forn(i, n) {
        prec[i][m] = {inf, -inf};
        for (int len = m - 1; len >= 0; --len) {
            prec[i][len] = {min(prec[i][len + 1].fi, a[i][len]),
                            max(prec[i][len + 1].se, a[i][len])};
            //printf("prec[%d][%d] = %d %d\n", i, len, prec[i][len].fi, prec[i][len].se);
        }
    }
 
    int start = 0;
    int finish = upper;
    while(start < finish) {
        int middle = (start + finish) / 2;
        if (check(middle)) {
            finish = middle;
        } else {
            start = middle + 1;
        }
    }
    return start;
}
 
 
int main() {
#ifdef LOCAL
    freopen("inp", "r", stdin);
    //freopen("outp", "w", stdout);
#else
    // freopen(TASKNAME ".in", "r", stdin);
    // freopen(TASKNAME ".out", "w", stdout);
#endif
    scanf("%d%d", &n, &m);
    global_min = inf;
    global_max = -inf;
    forn(i, n)
        forn(j, m) {
            scanf("%d", &a[i][j]);
            global_min = min(global_min, a[i][j]);
            global_max = max(global_max, a[i][j]);
        }
    forn(i, n)
        forn(j, m)
            pos_min.pb(a[i][j]);
    sort(pos_min.begin(), pos_min.end());
    pos_min.resize(unique(pos_min.begin(), pos_min.end()) - pos_min.begin());
    /*forn(i, n)
        forn(j, m)
            possible_min.insert(a[i][j]);*/
    int first = solve(global_max - global_min);
    forn(i, n)
        forn(j, m)
            b[n - i - 1][j] = a[i][j];
    memcpy(a, b, sizeof(b));
    /*forn(i, n) {
        forn(j, m)
            printf("%d ", b[i][j]);
        printf("\n");
    }*/
    int second = solve(first);
    //printf("first = %d second = %d\n", first, second);
    printf("%d", min(first, second));
}

Compilation message

joioi.cpp: In function 'int main()':
joioi.cpp:144:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
joioi.cpp:149:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &a[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 16120 KB Output is correct
2 Correct 18 ms 16232 KB Output is correct
3 Correct 19 ms 16400 KB Output is correct
4 Correct 19 ms 16468 KB Output is correct
5 Correct 19 ms 16468 KB Output is correct
6 Correct 19 ms 16468 KB Output is correct
7 Correct 19 ms 16468 KB Output is correct
8 Correct 20 ms 16468 KB Output is correct
9 Correct 18 ms 16468 KB Output is correct
10 Correct 21 ms 16468 KB Output is correct
11 Correct 19 ms 16476 KB Output is correct
12 Correct 19 ms 16476 KB Output is correct
13 Correct 19 ms 16476 KB Output is correct
14 Correct 21 ms 16476 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 16120 KB Output is correct
2 Correct 18 ms 16232 KB Output is correct
3 Correct 19 ms 16400 KB Output is correct
4 Correct 19 ms 16468 KB Output is correct
5 Correct 19 ms 16468 KB Output is correct
6 Correct 19 ms 16468 KB Output is correct
7 Correct 19 ms 16468 KB Output is correct
8 Correct 20 ms 16468 KB Output is correct
9 Correct 18 ms 16468 KB Output is correct
10 Correct 21 ms 16468 KB Output is correct
11 Correct 19 ms 16476 KB Output is correct
12 Correct 19 ms 16476 KB Output is correct
13 Correct 19 ms 16476 KB Output is correct
14 Correct 21 ms 16476 KB Output is correct
15 Correct 21 ms 16476 KB Output is correct
16 Correct 27 ms 18604 KB Output is correct
17 Correct 72 ms 19908 KB Output is correct
18 Correct 60 ms 19908 KB Output is correct
19 Correct 70 ms 19908 KB Output is correct
20 Correct 63 ms 19908 KB Output is correct
21 Correct 129 ms 20064 KB Output is correct
22 Correct 82 ms 20064 KB Output is correct
23 Correct 124 ms 20064 KB Output is correct
24 Correct 81 ms 20064 KB Output is correct
25 Correct 151 ms 20064 KB Output is correct
26 Correct 131 ms 20064 KB Output is correct
27 Correct 122 ms 20064 KB Output is correct
28 Correct 141 ms 20308 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 16120 KB Output is correct
2 Correct 18 ms 16232 KB Output is correct
3 Correct 19 ms 16400 KB Output is correct
4 Correct 19 ms 16468 KB Output is correct
5 Correct 19 ms 16468 KB Output is correct
6 Correct 19 ms 16468 KB Output is correct
7 Correct 19 ms 16468 KB Output is correct
8 Correct 20 ms 16468 KB Output is correct
9 Correct 18 ms 16468 KB Output is correct
10 Correct 21 ms 16468 KB Output is correct
11 Correct 19 ms 16476 KB Output is correct
12 Correct 19 ms 16476 KB Output is correct
13 Correct 19 ms 16476 KB Output is correct
14 Correct 21 ms 16476 KB Output is correct
15 Correct 21 ms 16476 KB Output is correct
16 Correct 27 ms 18604 KB Output is correct
17 Correct 72 ms 19908 KB Output is correct
18 Correct 60 ms 19908 KB Output is correct
19 Correct 70 ms 19908 KB Output is correct
20 Correct 63 ms 19908 KB Output is correct
21 Correct 129 ms 20064 KB Output is correct
22 Correct 82 ms 20064 KB Output is correct
23 Correct 124 ms 20064 KB Output is correct
24 Correct 81 ms 20064 KB Output is correct
25 Correct 151 ms 20064 KB Output is correct
26 Correct 131 ms 20064 KB Output is correct
27 Correct 122 ms 20064 KB Output is correct
28 Correct 141 ms 20308 KB Output is correct
29 Correct 3204 ms 134316 KB Output is correct
30 Correct 3165 ms 136420 KB Output is correct
31 Execution timed out 4014 ms 153296 KB Time limit exceeded
32 Halted 0 ms 0 KB -