oj.uz

Submission #46710

# Submission time Handle Problem Language Result Execution time Memory
46710 2018-04-22T15:33:22 Z kuzmichev_dima The Kingdom of JOIOI (JOI17_joioi) C++14
60 / 100
 4000 ms 119532 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>

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;

struct Event {
    int minn, row, diff;
};

bool operator < (Event fi, Event se) {
    return fi.minn < se.minn;
}

bool check(int delta) {
    //fprintf(stderr, "check %d\n", delta);
    vector<Event> events;
    vi app_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] = max(app_limits[j], cur_app);

            cur_dis = min(cur_dis, a[i][j] + 1);
            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++;
        }
        /*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);
        }
        //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]);
        }
    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:131:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
joioi.cpp:136:18: 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

# Verdict Execution time Memory Grader output
1 Correct 23 ms 16120 KB Output is correct
2 Correct 18 ms 16228 KB Output is correct
3 Correct 19 ms 16280 KB Output is correct
4 Correct 19 ms 16280 KB Output is correct
5 Correct 19 ms 16336 KB Output is correct
6 Correct 21 ms 16444 KB Output is correct
7 Correct 19 ms 16444 KB Output is correct
8 Correct 21 ms 16444 KB Output is correct
9 Correct 20 ms 16444 KB Output is correct
10 Correct 20 ms 16508 KB Output is correct
11 Correct 19 ms 16508 KB Output is correct
12 Correct 19 ms 16508 KB Output is correct
13 Correct 19 ms 16508 KB Output is correct
14 Correct 19 ms 16508 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 16120 KB Output is correct
2 Correct 18 ms 16228 KB Output is correct
3 Correct 19 ms 16280 KB Output is correct
4 Correct 19 ms 16280 KB Output is correct
5 Correct 19 ms 16336 KB Output is correct
6 Correct 21 ms 16444 KB Output is correct
7 Correct 19 ms 16444 KB Output is correct
8 Correct 21 ms 16444 KB Output is correct
9 Correct 20 ms 16444 KB Output is correct
10 Correct 20 ms 16508 KB Output is correct
11 Correct 19 ms 16508 KB Output is correct
12 Correct 19 ms 16508 KB Output is correct
13 Correct 19 ms 16508 KB Output is correct
14 Correct 19 ms 16508 KB Output is correct
15 Correct 23 ms 16608 KB Output is correct
16 Correct 27 ms 18524 KB Output is correct
17 Correct 168 ms 21004 KB Output is correct
18 Correct 77 ms 21004 KB Output is correct
19 Correct 120 ms 21004 KB Output is correct
20 Correct 97 ms 21004 KB Output is correct
21 Correct 286 ms 21040 KB Output is correct
22 Correct 172 ms 21040 KB Output is correct
23 Correct 238 ms 21040 KB Output is correct
24 Correct 100 ms 21040 KB Output is correct
25 Correct 273 ms 21040 KB Output is correct
26 Correct 292 ms 21040 KB Output is correct
27 Correct 266 ms 21040 KB Output is correct
28 Correct 276 ms 21184 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 16120 KB Output is correct
2 Correct 18 ms 16228 KB Output is correct
3 Correct 19 ms 16280 KB Output is correct
4 Correct 19 ms 16280 KB Output is correct
5 Correct 19 ms 16336 KB Output is correct
6 Correct 21 ms 16444 KB Output is correct
7 Correct 19 ms 16444 KB Output is correct
8 Correct 21 ms 16444 KB Output is correct
9 Correct 20 ms 16444 KB Output is correct
10 Correct 20 ms 16508 KB Output is correct
11 Correct 19 ms 16508 KB Output is correct
12 Correct 19 ms 16508 KB Output is correct
13 Correct 19 ms 16508 KB Output is correct
14 Correct 19 ms 16508 KB Output is correct
15 Correct 23 ms 16608 KB Output is correct
16 Correct 27 ms 18524 KB Output is correct
17 Correct 168 ms 21004 KB Output is correct
18 Correct 77 ms 21004 KB Output is correct
19 Correct 120 ms 21004 KB Output is correct
20 Correct 97 ms 21004 KB Output is correct
21 Correct 286 ms 21040 KB Output is correct
22 Correct 172 ms 21040 KB Output is correct
23 Correct 238 ms 21040 KB Output is correct
24 Correct 100 ms 21040 KB Output is correct
25 Correct 273 ms 21040 KB Output is correct
26 Correct 292 ms 21040 KB Output is correct
27 Correct 266 ms 21040 KB Output is correct
28 Correct 276 ms 21184 KB Output is correct
29 Execution timed out 4042 ms 119532 KB Time limit exceeded
30 Halted 0 ms 0 KB -