oj.uz

Submission #346704

# Submission time Handle Problem Language Result Execution time Memory
346704 2021-01-10T18:39:08 Z YJU Boat (APIO16_boat) C++14
100 / 100
 292 ms 492 KB 
#include <cstdio>
#include <algorithm>
typedef long long ll;
const int MAXN = 500;
const ll MOD = 1000000007LL;
using namespace std;
int top, a[MAXN+1], b[MAXN+1], l[MAXN+1], r[MAXN+1], h[2*MAXN+1], g[MAXN+1];
ll inv[MAXN+1], C[MAXN+1];

int main()
{
    int N;
    scanf("%d", &N);

    inv[1] = 1;
    for (int i = 2; i <= N; ++i)
        inv[i] = (MOD-MOD/i)*inv[MOD%i]%MOD;

    for (int i = 1; i <= N; ++i) {
        scanf("%d %d", &a[i], &b[i]);
        h[2*i-1] = a[i];
        h[2*i] = b[i]+1;
    }
    sort(h+1, h+2*N+1);
    top = unique(h+1, h+2*N+1)-h-1;

    for (int i = 1; i <= N; ++i) { // [l, r)
        l[i] = lower_bound(h+1, h+1+top, a[i])-h;
        r[i] = lower_bound(h+1, h+1+top, b[i]+1)-h;
    }

    g[0] = 1;
    C[0] = 1;
    for (int j = 1; j < top; ++j) {
        int L = h[j+1]-h[j];

        for (int i = 1; i <= N; ++i)
            C[i] = C[i-1]*(L+i-1) %MOD * inv[i] %MOD;

        for (int i = N; i >= 1; --i) {
            if (l[i]<=j && j+1<=r[i]) {
                ll f = 0, m = 1, c = L; // m: p+1~i號學校有多少能選區間j
                for (int p = i-1; p >= 0; --p) {
                    f = (f + c*g[p]) % MOD;
                    if (l[p]<=j && j+1<=r[p])
                        c = C[++m];
                }
                g[i] = (g[i]+f) % MOD;
            }
        }
    }

    int ans = 0;
    for (int i = 1; i <= N; ++i)
        ans = (ans+g[i]) % MOD;
    printf("%d", ans);
    return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |     scanf("%d", &N);
      |     ~~~~~^~~~~~~~~~
boat.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |         scanf("%d %d", &a[i], &b[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 364 KB Output is correct
2 Correct 9 ms 364 KB Output is correct
3 Correct 9 ms 364 KB Output is correct
4 Correct 9 ms 364 KB Output is correct
5 Correct 9 ms 364 KB Output is correct
6 Correct 8 ms 364 KB Output is correct
7 Correct 8 ms 364 KB Output is correct
8 Correct 8 ms 364 KB Output is correct
9 Correct 8 ms 364 KB Output is correct
10 Correct 8 ms 364 KB Output is correct
11 Correct 8 ms 364 KB Output is correct
12 Correct 9 ms 364 KB Output is correct
13 Correct 9 ms 364 KB Output is correct
14 Correct 8 ms 364 KB Output is correct
15 Correct 9 ms 492 KB Output is correct
16 Correct 3 ms 364 KB Output is correct
17 Correct 3 ms 364 KB Output is correct
18 Correct 3 ms 364 KB Output is correct
19 Correct 3 ms 364 KB Output is correct
20 Correct 3 ms 364 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 364 KB Output is correct
2 Correct 9 ms 364 KB Output is correct
3 Correct 9 ms 364 KB Output is correct
4 Correct 9 ms 364 KB Output is correct
5 Correct 9 ms 364 KB Output is correct
6 Correct 8 ms 364 KB Output is correct
7 Correct 8 ms 364 KB Output is correct
8 Correct 8 ms 364 KB Output is correct
9 Correct 8 ms 364 KB Output is correct
10 Correct 8 ms 364 KB Output is correct
11 Correct 8 ms 364 KB Output is correct
12 Correct 9 ms 364 KB Output is correct
13 Correct 9 ms 364 KB Output is correct
14 Correct 8 ms 364 KB Output is correct
15 Correct 9 ms 492 KB Output is correct
16 Correct 3 ms 364 KB Output is correct
17 Correct 3 ms 364 KB Output is correct
18 Correct 3 ms 364 KB Output is correct
19 Correct 3 ms 364 KB Output is correct
20 Correct 3 ms 364 KB Output is correct
21 Correct 193 ms 492 KB Output is correct
22 Correct 185 ms 492 KB Output is correct
23 Correct 175 ms 380 KB Output is correct
24 Correct 183 ms 380 KB Output is correct
25 Correct 182 ms 364 KB Output is correct
26 Correct 252 ms 364 KB Output is correct
27 Correct 259 ms 364 KB Output is correct
28 Correct 252 ms 492 KB Output is correct
29 Correct 250 ms 364 KB Output is correct
30 Correct 10 ms 364 KB Output is correct
31 Correct 9 ms 364 KB Output is correct
32 Correct 9 ms 364 KB Output is correct
33 Correct 9 ms 364 KB Output is correct
34 Correct 9 ms 364 KB Output is correct
35 Correct 10 ms 364 KB Output is correct
36 Correct 10 ms 364 KB Output is correct
37 Correct 10 ms 364 KB Output is correct
38 Correct 10 ms 364 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 364 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 3 ms 364 KB Output is correct
8 Correct 3 ms 364 KB Output is correct
9 Correct 3 ms 364 KB Output is correct
10 Correct 3 ms 364 KB Output is correct
11 Correct 2 ms 364 KB Output is correct
12 Correct 2 ms 364 KB Output is correct
13 Correct 2 ms 364 KB Output is correct
14 Correct 2 ms 364 KB Output is correct
15 Correct 2 ms 364 KB Output is correct
16 Correct 2 ms 364 KB Output is correct
17 Correct 2 ms 364 KB Output is correct
18 Correct 2 ms 364 KB Output is correct
19 Correct 2 ms 364 KB Output is correct
20 Correct 2 ms 364 KB Output is correct

Subtask #4
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 364 KB Output is correct
2 Correct 9 ms 364 KB Output is correct
3 Correct 9 ms 364 KB Output is correct
4 Correct 9 ms 364 KB Output is correct
5 Correct 9 ms 364 KB Output is correct
6 Correct 8 ms 364 KB Output is correct
7 Correct 8 ms 364 KB Output is correct
8 Correct 8 ms 364 KB Output is correct
9 Correct 8 ms 364 KB Output is correct
10 Correct 8 ms 364 KB Output is correct
11 Correct 8 ms 364 KB Output is correct
12 Correct 9 ms 364 KB Output is correct
13 Correct 9 ms 364 KB Output is correct
14 Correct 8 ms 364 KB Output is correct
15 Correct 9 ms 492 KB Output is correct
16 Correct 3 ms 364 KB Output is correct
17 Correct 3 ms 364 KB Output is correct
18 Correct 3 ms 364 KB Output is correct
19 Correct 3 ms 364 KB Output is correct
20 Correct 3 ms 364 KB Output is correct
21 Correct 193 ms 492 KB Output is correct
22 Correct 185 ms 492 KB Output is correct
23 Correct 175 ms 380 KB Output is correct
24 Correct 183 ms 380 KB Output is correct
25 Correct 182 ms 364 KB Output is correct
26 Correct 252 ms 364 KB Output is correct
27 Correct 259 ms 364 KB Output is correct
28 Correct 252 ms 492 KB Output is correct
29 Correct 250 ms 364 KB Output is correct
30 Correct 10 ms 364 KB Output is correct
31 Correct 9 ms 364 KB Output is correct
32 Correct 9 ms 364 KB Output is correct
33 Correct 9 ms 364 KB Output is correct
34 Correct 9 ms 364 KB Output is correct
35 Correct 10 ms 364 KB Output is correct
36 Correct 10 ms 364 KB Output is correct
37 Correct 10 ms 364 KB Output is correct
38 Correct 10 ms 364 KB Output is correct
39 Correct 2 ms 364 KB Output is correct
40 Correct 2 ms 364 KB Output is correct
41 Correct 2 ms 364 KB Output is correct
42 Correct 2 ms 364 KB Output is correct
43 Correct 3 ms 364 KB Output is correct
44 Correct 3 ms 364 KB Output is correct
45 Correct 3 ms 364 KB Output is correct
46 Correct 3 ms 364 KB Output is correct
47 Correct 3 ms 364 KB Output is correct
48 Correct 3 ms 364 KB Output is correct
49 Correct 2 ms 364 KB Output is correct
50 Correct 2 ms 364 KB Output is correct
51 Correct 2 ms 364 KB Output is correct
52 Correct 2 ms 364 KB Output is correct
53 Correct 2 ms 364 KB Output is correct
54 Correct 2 ms 364 KB Output is correct
55 Correct 2 ms 364 KB Output is correct
56 Correct 2 ms 364 KB Output is correct
57 Correct 2 ms 364 KB Output is correct
58 Correct 2 ms 364 KB Output is correct
59 Correct 206 ms 364 KB Output is correct
60 Correct 198 ms 364 KB Output is correct
61 Correct 186 ms 492 KB Output is correct
62 Correct 205 ms 364 KB Output is correct
63 Correct 203 ms 384 KB Output is correct
64 Correct 291 ms 364 KB Output is correct
65 Correct 290 ms 492 KB Output is correct
66 Correct 289 ms 492 KB Output is correct
67 Correct 292 ms 492 KB Output is correct
68 Correct 292 ms 492 KB Output is correct
69 Correct 158 ms 364 KB Output is correct
70 Correct 154 ms 364 KB Output is correct
71 Correct 153 ms 492 KB Output is correct
72 Correct 165 ms 364 KB Output is correct
73 Correct 165 ms 384 KB Output is correct
74 Correct 40 ms 364 KB Output is correct
75 Correct 38 ms 364 KB Output is correct
76 Correct 40 ms 364 KB Output is correct
77 Correct 40 ms 364 KB Output is correct
78 Correct 45 ms 364 KB Output is correct