oj.uz

Submission #46713

# Submission time Handle Problem Language Result Execution time Memory
46713 2018-04-22T15:45:35 Z kuzmichev_dima The Kingdom of JOIOI (JOI17_joioi) C++14
60 / 100
 4000 ms 146564 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;
//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 (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)
            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:139:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
joioi.cpp:144:18: 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 17 ms 16120 KB Output is correct
2 Correct 18 ms 16356 KB Output is correct
3 Correct 17 ms 16424 KB Output is correct
4 Correct 17 ms 16424 KB Output is correct
5 Correct 18 ms 16424 KB Output is correct
6 Correct 17 ms 16424 KB Output is correct
7 Correct 18 ms 16424 KB Output is correct
8 Correct 17 ms 16424 KB Output is correct
9 Correct 19 ms 16424 KB Output is correct
10 Correct 18 ms 16424 KB Output is correct
11 Correct 18 ms 16424 KB Output is correct
12 Correct 19 ms 16424 KB Output is correct
13 Correct 18 ms 16424 KB Output is correct
14 Correct 17 ms 16424 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 16120 KB Output is correct
2 Correct 18 ms 16356 KB Output is correct
3 Correct 17 ms 16424 KB Output is correct
4 Correct 17 ms 16424 KB Output is correct
5 Correct 18 ms 16424 KB Output is correct
6 Correct 17 ms 16424 KB Output is correct
7 Correct 18 ms 16424 KB Output is correct
8 Correct 17 ms 16424 KB Output is correct
9 Correct 19 ms 16424 KB Output is correct
10 Correct 18 ms 16424 KB Output is correct
11 Correct 18 ms 16424 KB Output is correct
12 Correct 19 ms 16424 KB Output is correct
13 Correct 18 ms 16424 KB Output is correct
14 Correct 17 ms 16424 KB Output is correct
15 Correct 17 ms 16528 KB Output is correct
16 Correct 32 ms 18220 KB Output is correct
17 Correct 69 ms 19828 KB Output is correct
18 Correct 63 ms 19828 KB Output is correct
19 Correct 63 ms 19828 KB Output is correct
20 Correct 53 ms 19828 KB Output is correct
21 Correct 141 ms 20100 KB Output is correct
22 Correct 87 ms 20100 KB Output is correct
23 Correct 103 ms 20100 KB Output is correct
24 Correct 75 ms 20100 KB Output is correct
25 Correct 159 ms 20100 KB Output is correct
26 Correct 122 ms 20100 KB Output is correct
27 Correct 108 ms 20100 KB Output is correct
28 Correct 133 ms 20100 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 16120 KB Output is correct
2 Correct 18 ms 16356 KB Output is correct
3 Correct 17 ms 16424 KB Output is correct
4 Correct 17 ms 16424 KB Output is correct
5 Correct 18 ms 16424 KB Output is correct
6 Correct 17 ms 16424 KB Output is correct
7 Correct 18 ms 16424 KB Output is correct
8 Correct 17 ms 16424 KB Output is correct
9 Correct 19 ms 16424 KB Output is correct
10 Correct 18 ms 16424 KB Output is correct
11 Correct 18 ms 16424 KB Output is correct
12 Correct 19 ms 16424 KB Output is correct
13 Correct 18 ms 16424 KB Output is correct
14 Correct 17 ms 16424 KB Output is correct
15 Correct 17 ms 16528 KB Output is correct
16 Correct 32 ms 18220 KB Output is correct
17 Correct 69 ms 19828 KB Output is correct
18 Correct 63 ms 19828 KB Output is correct
19 Correct 63 ms 19828 KB Output is correct
20 Correct 53 ms 19828 KB Output is correct
21 Correct 141 ms 20100 KB Output is correct
22 Correct 87 ms 20100 KB Output is correct
23 Correct 103 ms 20100 KB Output is correct
24 Correct 75 ms 20100 KB Output is correct
25 Correct 159 ms 20100 KB Output is correct
26 Correct 122 ms 20100 KB Output is correct
27 Correct 108 ms 20100 KB Output is correct
28 Correct 133 ms 20100 KB Output is correct
29 Correct 2753 ms 119364 KB Output is correct
30 Correct 2746 ms 121840 KB Output is correct
31 Correct 3890 ms 137580 KB Output is correct
32 Correct 2405 ms 137580 KB Output is correct
33 Correct 2232 ms 137580 KB Output is correct
34 Correct 3127 ms 137580 KB Output is correct
35 Execution timed out 4040 ms 146564 KB Time limit exceeded
36 Halted 0 ms 0 KB -