oj.uz

Submission #666723

# Submission time Handle Problem Language Result Execution time Memory
666723 2022-11-29T12:38:49 Z omikron123 Job Scheduling (CEOI12_jobs) C++14
100 / 100
 183 ms 13700 KB 
// https://oj.uz/problem/view/CEOI12_jobs

#include <cstdio>
#include <algorithm>
#include <queue>
#include <vector>

using namespace std;

// n,d<=1e5, m<=1e6
int n, d, m;

struct J {
    int s, idx;
};
J jobs[1000005];

// return if x machine is enough
bool check(int x, bool print) {
    int j = 0;  // job index
    for (int i = 1; i <= n; i++) {
        // do jobs
        int cnt = 0;
        while(cnt < x && j < m && jobs[j].s <= i) {
            if (jobs[j].s + d < i)       // already expired
                return false;
            if (print)
                printf("%d ", jobs[j].idx);
            cnt++;
            j++;
        }
        if (print)
            printf("0\n");
    }
    return true;
}

inline bool cmp(J &a, J &b) {return a.s < b.s;}

inline int read() {
    int r = 0;
    bool start = false, neg = false;
    while (true) {
        char c = getchar();
        if (!start && c != '-' && (c < '0' || c > '9')) continue;
        start = true;
        if (c == '-') neg = true;
        else if (c >= '0' && c <= '9')
            r = r * 10 + c - '0';
        else
            break;
    }
    return r;
}

int main() {
    scanf("%d %d %d", &n, &d, &m);
    for (int i = 0; i < m; i++) {
        jobs[i].s = read();
        jobs[i].idx = i+1;
    }
    sort(jobs, jobs+m, cmp);

    int low = 1, high = m;
    while (low < high) {
        int mid = (low + high) / 2;
        if (check(mid, false))
            high = mid;
        else
            low = mid+1;
    }
    printf("%d\n", low);
    check(low, true);

    return 0;
}

/*
8 2 12
1 2 4 2 1 3 5 6 2 3 6 4

answer is 2
*/

Compilation message

jobs.cpp: In function 'int read()':
jobs.cpp:42:25: warning: variable 'neg' set but not used [-Wunused-but-set-variable]
   42 |     bool start = false, neg = false;
      |                         ^~~
jobs.cpp: In function 'int main()':
jobs.cpp:57:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     scanf("%d %d %d", &n, &d, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 1580 KB Output is correct
2 Correct 17 ms 1572 KB Output is correct
3 Correct 16 ms 1576 KB Output is correct
4 Correct 15 ms 1600 KB Output is correct
5 Correct 15 ms 1620 KB Output is correct
6 Correct 16 ms 1620 KB Output is correct
7 Correct 15 ms 1668 KB Output is correct
8 Correct 17 ms 1644 KB Output is correct
9 Correct 21 ms 1748 KB Output is correct
10 Correct 22 ms 1852 KB Output is correct
11 Correct 19 ms 1580 KB Output is correct
12 Correct 40 ms 3108 KB Output is correct
13 Correct 60 ms 4528 KB Output is correct
14 Correct 90 ms 6088 KB Output is correct
15 Correct 104 ms 7576 KB Output is correct
16 Correct 136 ms 9036 KB Output is correct
17 Correct 147 ms 10492 KB Output is correct
18 Correct 161 ms 11980 KB Output is correct
19 Correct 183 ms 13700 KB Output is correct
20 Correct 146 ms 10492 KB Output is correct