oj.uz

답안 #46678

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
46678 2018-04-22T14:42:23 Z kuzmichev_dima The Kingdom of JOIOI (JOI17_joioi) C++14
60 / 100
 4000 ms 119368 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;
    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_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() {
    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 = global_max - global_min;
    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();
    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();
    //printf("first = %d second = %d\n", first, second);
    printf("%d", min(first, second));
}

Compilation message

joioi.cpp: In function 'int main()':
joioi.cpp:126:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
joioi.cpp:131:18: 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 17 ms 16120 KB Output is correct
2 Correct 17 ms 16228 KB Output is correct
3 Correct 17 ms 16304 KB Output is correct
4 Correct 22 ms 16304 KB Output is correct
5 Correct 17 ms 16544 KB Output is correct
6 Correct 18 ms 16544 KB Output is correct
7 Correct 18 ms 16544 KB Output is correct
8 Correct 17 ms 16544 KB Output is correct
9 Correct 17 ms 16544 KB Output is correct
10 Correct 18 ms 16544 KB Output is correct
11 Correct 17 ms 16544 KB Output is correct
12 Correct 18 ms 16544 KB Output is correct
13 Correct 22 ms 16544 KB Output is correct
14 Correct 18 ms 16544 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 16120 KB Output is correct
2 Correct 17 ms 16228 KB Output is correct
3 Correct 17 ms 16304 KB Output is correct
4 Correct 22 ms 16304 KB Output is correct
5 Correct 17 ms 16544 KB Output is correct
6 Correct 18 ms 16544 KB Output is correct
7 Correct 18 ms 16544 KB Output is correct
8 Correct 17 ms 16544 KB Output is correct
9 Correct 17 ms 16544 KB Output is correct
10 Correct 18 ms 16544 KB Output is correct
11 Correct 17 ms 16544 KB Output is correct
12 Correct 18 ms 16544 KB Output is correct
13 Correct 22 ms 16544 KB Output is correct
14 Correct 18 ms 16544 KB Output is correct
15 Correct 18 ms 16636 KB Output is correct
16 Correct 24 ms 18516 KB Output is correct
17 Correct 230 ms 21064 KB Output is correct
18 Correct 213 ms 21064 KB Output is correct
19 Correct 214 ms 21064 KB Output is correct
20 Correct 177 ms 21064 KB Output is correct
21 Correct 353 ms 21076 KB Output is correct
22 Correct 311 ms 21076 KB Output is correct
23 Correct 290 ms 21076 KB Output is correct
24 Correct 278 ms 21076 KB Output is correct
25 Correct 297 ms 21076 KB Output is correct
26 Correct 349 ms 21076 KB Output is correct
27 Correct 405 ms 21188 KB Output is correct
28 Correct 351 ms 21188 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 16120 KB Output is correct
2 Correct 17 ms 16228 KB Output is correct
3 Correct 17 ms 16304 KB Output is correct
4 Correct 22 ms 16304 KB Output is correct
5 Correct 17 ms 16544 KB Output is correct
6 Correct 18 ms 16544 KB Output is correct
7 Correct 18 ms 16544 KB Output is correct
8 Correct 17 ms 16544 KB Output is correct
9 Correct 17 ms 16544 KB Output is correct
10 Correct 18 ms 16544 KB Output is correct
11 Correct 17 ms 16544 KB Output is correct
12 Correct 18 ms 16544 KB Output is correct
13 Correct 22 ms 16544 KB Output is correct
14 Correct 18 ms 16544 KB Output is correct
15 Correct 18 ms 16636 KB Output is correct
16 Correct 24 ms 18516 KB Output is correct
17 Correct 230 ms 21064 KB Output is correct
18 Correct 213 ms 21064 KB Output is correct
19 Correct 214 ms 21064 KB Output is correct
20 Correct 177 ms 21064 KB Output is correct
21 Correct 353 ms 21076 KB Output is correct
22 Correct 311 ms 21076 KB Output is correct
23 Correct 290 ms 21076 KB Output is correct
24 Correct 278 ms 21076 KB Output is correct
25 Correct 297 ms 21076 KB Output is correct
26 Correct 349 ms 21076 KB Output is correct
27 Correct 405 ms 21188 KB Output is correct
28 Correct 351 ms 21188 KB Output is correct
29 Execution timed out 4022 ms 119368 KB Time limit exceeded
30 Halted 0 ms 0 KB -