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Submission #398385

# Submission time Handle Problem Language Result Execution time Memory
398385 2021-05-04T08:23:38 Z jack715 Strange Device (APIO19_strange_device) C++14
65 / 100
 591 ms 16928 KB 
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define pp pop_back
#define mp make_pair
#define bb back
#define ff first
#define ss second
#define int long long

using namespace std;

/*
 ____     __    _______    _______   __________
|     \  |  |  |  _____|  /  _____) |____  ____|
|  |\  \ |  |  | |__     (  (_____      |  |
|  | \  \|  |  |  __|     \_____  \     |  | 
|  |  \     |  | |_____    _____)  )    |  | 
|__|   \____|  |_______|  (_______/     |__| 
*/

int INF = LLONG_MAX;

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, A, B, I, gcd, k, l, r;
    cin >> n >> A >> B;
    gcd = __gcd(A, B+1);

    if (gcd == 1) k = A;
    else k = A / gcd;

    if (INF / k <= B) 
        I = INF;
    else 
        I = k*B;

    vector<pair<int, int> > rem;
    for (int i = 0; i < n; i++) {
        cin >> l >> r;
        if (r-l >= I) {
            rem.pb({0, I});
        } else if (l%I > r%I) {
            rem.pb({l%I, I-1});
            rem.pb({0, r%I});
        } else {
            rem.pb({l%I, r%I});
        } 
    }

    int L = 0, ans = 0;
    sort(rem.begin(), rem.end());
    for (auto el : rem) {
        el.ff = max(el.ff, L);
        if (el.ff > el.ss)
            continue;
        ans += el.ss-el.ff+1;
        L = max(L, el.ss+1);
    }
    cout << ans << '\n';
    return 0;
}

/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?)
    * do smth instead of nothing and stay organized
    * WRITE STUFF DOWN
    * DON'T GET STUCK ON ONE APPROACH
*/

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 5 ms 592 KB Output is correct
3 Correct 5 ms 592 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 276 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 8 ms 704 KB Output is correct
17 Correct 49 ms 2416 KB Output is correct
18 Correct 1 ms 204 KB Output is correct

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 335 ms 16824 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 490 ms 16784 KB Output is correct
3 Correct 462 ms 16752 KB Output is correct
4 Correct 513 ms 16928 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 490 ms 16784 KB Output is correct
3 Correct 462 ms 16752 KB Output is correct
4 Correct 513 ms 16928 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 487 ms 16840 KB Output is correct
7 Correct 478 ms 16900 KB Output is correct
8 Correct 470 ms 16744 KB Output is correct
9 Correct 591 ms 16780 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 490 ms 16784 KB Output is correct
3 Correct 462 ms 16752 KB Output is correct
4 Correct 513 ms 16928 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 53 ms 2400 KB Output is correct
7 Correct 51 ms 2456 KB Output is correct
8 Correct 51 ms 2496 KB Output is correct
9 Correct 47 ms 2392 KB Output is correct
10 Correct 45 ms 2432 KB Output is correct
11 Correct 60 ms 2420 KB Output is correct
12 Correct 52 ms 2496 KB Output is correct
13 Correct 51 ms 2408 KB Output is correct
14 Correct 44 ms 2516 KB Output is correct
15 Correct 52 ms 2400 KB Output is correct
16 Correct 54 ms 2500 KB Output is correct
17 Correct 47 ms 2392 KB Output is correct
18 Correct 495 ms 16812 KB Output is correct
19 Correct 462 ms 16872 KB Output is correct
20 Correct 539 ms 16804 KB Output is correct
21 Correct 51 ms 2428 KB Output is correct
22 Correct 42 ms 2496 KB Output is correct
23 Correct 146 ms 8572 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 50 ms 2504 KB Output is correct
3 Correct 56 ms 2476 KB Output is correct
4 Correct 551 ms 16816 KB Output is correct
5 Correct 56 ms 2392 KB Output is correct
6 Correct 51 ms 2480 KB Output is correct
7 Correct 49 ms 2432 KB Output is correct
8 Correct 54 ms 2456 KB Output is correct
9 Correct 47 ms 2428 KB Output is correct
10 Correct 55 ms 2520 KB Output is correct
11 Correct 47 ms 2444 KB Output is correct
12 Correct 41 ms 2504 KB Output is correct
13 Correct 55 ms 2496 KB Output is correct
14 Correct 520 ms 16760 KB Output is correct
15 Correct 47 ms 2504 KB Output is correct
16 Correct 512 ms 16740 KB Output is correct
17 Correct 493 ms 16804 KB Output is correct
18 Correct 1 ms 204 KB Output is correct

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 5 ms 592 KB Output is correct
3 Correct 5 ms 592 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 276 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 8 ms 704 KB Output is correct
17 Correct 49 ms 2416 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Incorrect 1 ms 204 KB Output isn't correct
21 Halted 0 ms 0 KB -