oj.uz

답안 #230108

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
230108 2020-05-08T11:14:36 Z lyc Boat (APIO16_boat) C++14
100 / 100
 655 ms 2480 KB 
#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for (int i=(a);i>=(b);--i)

const int MX_N = 505;
const int MOD = 1e9+7;

int N, A[MX_N], B[MX_N];
vector<int> val;

int inv[MX_N];
int f[MX_N][2*MX_N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> N;
    FOR(i,1,N){
        cin >> A[i] >> B[i];
        B[i] += 1;
        val.push_back(A[i]);
        val.push_back(B[i]);
    }
    sort(ALL(val));
    val.resize(unique(ALL(val))-val.begin());
    FOR(i,1,N){
        A[i] = lower_bound(ALL(val),A[i])-val.begin();
        B[i] = lower_bound(ALL(val),B[i])-val.begin();
    }
    inv[1] = 1; FOR(i,2,N) inv[i] = (long long) (MOD-MOD/i) * inv[MOD%i] % MOD;

    FOR(p,0,SZ(val)-1) f[N+1][p] = 1;
    FOR(i,1,N) f[i][SZ(val)] = 0;
    RFOR(p,SZ(val)-2,0){
        int lp = val[p+1]-val[p];
        RFOR(i,N,1){
            f[i][p] = 0;
            if (p < SZ(val)-1) f[i][p] = (f[i][p] + f[i][p+1]) % MOD;
            if (A[i] <= p && p < B[i]) {
                int m = 0;
                int g = lp;
                FOR(j,i+1,N+1){
                    f[i][p] = (f[i][p] + (long long) g * f[j][p+1] % MOD) % MOD;
                    if (A[j] <= p && p < B[j]) {
                        ++m;
                        g = (long long) g * (m + lp) % MOD * inv[m+1] % MOD;
                    }
                }
            }
            //TRACE(i _ p _ f[i][p]);
        }
    }
    int ans = 0;
    FOR(i,1,N) ans = (ans + f[i][0]) % MOD;
    cout << ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 2304 KB Output is correct
2 Correct 8 ms 2304 KB Output is correct
3 Correct 8 ms 2304 KB Output is correct
4 Correct 8 ms 2304 KB Output is correct
5 Correct 8 ms 2304 KB Output is correct
6 Correct 8 ms 2304 KB Output is correct
7 Correct 8 ms 2304 KB Output is correct
8 Correct 8 ms 2304 KB Output is correct
9 Correct 8 ms 2304 KB Output is correct
10 Correct 8 ms 2304 KB Output is correct
11 Correct 8 ms 2304 KB Output is correct
12 Correct 8 ms 2304 KB Output is correct
13 Correct 8 ms 2304 KB Output is correct
14 Correct 8 ms 2304 KB Output is correct
15 Correct 8 ms 2304 KB Output is correct
16 Correct 7 ms 2304 KB Output is correct
17 Correct 7 ms 2304 KB Output is correct
18 Correct 7 ms 2304 KB Output is correct
19 Correct 7 ms 2304 KB Output is correct
20 Correct 7 ms 2304 KB Output is correct

Subtask #2
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 2304 KB Output is correct
2 Correct 8 ms 2304 KB Output is correct
3 Correct 8 ms 2304 KB Output is correct
4 Correct 8 ms 2304 KB Output is correct
5 Correct 8 ms 2304 KB Output is correct
6 Correct 8 ms 2304 KB Output is correct
7 Correct 8 ms 2304 KB Output is correct
8 Correct 8 ms 2304 KB Output is correct
9 Correct 8 ms 2304 KB Output is correct
10 Correct 8 ms 2304 KB Output is correct
11 Correct 8 ms 2304 KB Output is correct
12 Correct 8 ms 2304 KB Output is correct
13 Correct 8 ms 2304 KB Output is correct
14 Correct 8 ms 2304 KB Output is correct
15 Correct 8 ms 2304 KB Output is correct
16 Correct 7 ms 2304 KB Output is correct
17 Correct 7 ms 2304 KB Output is correct
18 Correct 7 ms 2304 KB Output is correct
19 Correct 7 ms 2304 KB Output is correct
20 Correct 7 ms 2304 KB Output is correct
21 Correct 322 ms 2424 KB Output is correct
22 Correct 316 ms 2424 KB Output is correct
23 Correct 296 ms 2304 KB Output is correct
24 Correct 305 ms 2424 KB Output is correct
25 Correct 333 ms 2304 KB Output is correct
26 Correct 563 ms 2424 KB Output is correct
27 Correct 579 ms 2424 KB Output is correct
28 Correct 568 ms 2424 KB Output is correct
29 Correct 560 ms 2424 KB Output is correct
30 Correct 9 ms 2304 KB Output is correct
31 Correct 9 ms 2304 KB Output is correct
32 Correct 10 ms 2304 KB Output is correct
33 Correct 10 ms 2304 KB Output is correct
34 Correct 9 ms 2304 KB Output is correct
35 Correct 9 ms 2304 KB Output is correct
36 Correct 10 ms 2480 KB Output is correct
37 Correct 10 ms 2304 KB Output is correct
38 Correct 10 ms 2304 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 768 KB Output is correct
2 Correct 9 ms 768 KB Output is correct
3 Correct 8 ms 768 KB Output is correct
4 Correct 8 ms 768 KB Output is correct
5 Correct 8 ms 820 KB Output is correct
6 Correct 10 ms 768 KB Output is correct
7 Correct 10 ms 768 KB Output is correct
8 Correct 10 ms 768 KB Output is correct
9 Correct 10 ms 768 KB Output is correct
10 Correct 10 ms 768 KB Output is correct
11 Correct 8 ms 768 KB Output is correct
12 Correct 7 ms 768 KB Output is correct
13 Correct 8 ms 768 KB Output is correct
14 Correct 8 ms 768 KB Output is correct
15 Correct 8 ms 768 KB Output is correct
16 Correct 7 ms 768 KB Output is correct
17 Correct 6 ms 768 KB Output is correct
18 Correct 7 ms 768 KB Output is correct
19 Correct 6 ms 768 KB Output is correct
20 Correct 6 ms 768 KB Output is correct

Subtask #4
42.0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 2304 KB Output is correct
2 Correct 8 ms 2304 KB Output is correct
3 Correct 8 ms 2304 KB Output is correct
4 Correct 8 ms 2304 KB Output is correct
5 Correct 8 ms 2304 KB Output is correct
6 Correct 8 ms 2304 KB Output is correct
7 Correct 8 ms 2304 KB Output is correct
8 Correct 8 ms 2304 KB Output is correct
9 Correct 8 ms 2304 KB Output is correct
10 Correct 8 ms 2304 KB Output is correct
11 Correct 8 ms 2304 KB Output is correct
12 Correct 8 ms 2304 KB Output is correct
13 Correct 8 ms 2304 KB Output is correct
14 Correct 8 ms 2304 KB Output is correct
15 Correct 8 ms 2304 KB Output is correct
16 Correct 7 ms 2304 KB Output is correct
17 Correct 7 ms 2304 KB Output is correct
18 Correct 7 ms 2304 KB Output is correct
19 Correct 7 ms 2304 KB Output is correct
20 Correct 7 ms 2304 KB Output is correct
21 Correct 322 ms 2424 KB Output is correct
22 Correct 316 ms 2424 KB Output is correct
23 Correct 296 ms 2304 KB Output is correct
24 Correct 305 ms 2424 KB Output is correct
25 Correct 333 ms 2304 KB Output is correct
26 Correct 563 ms 2424 KB Output is correct
27 Correct 579 ms 2424 KB Output is correct
28 Correct 568 ms 2424 KB Output is correct
29 Correct 560 ms 2424 KB Output is correct
30 Correct 9 ms 2304 KB Output is correct
31 Correct 9 ms 2304 KB Output is correct
32 Correct 10 ms 2304 KB Output is correct
33 Correct 10 ms 2304 KB Output is correct
34 Correct 9 ms 2304 KB Output is correct
35 Correct 9 ms 2304 KB Output is correct
36 Correct 10 ms 2480 KB Output is correct
37 Correct 10 ms 2304 KB Output is correct
38 Correct 10 ms 2304 KB Output is correct
39 Correct 8 ms 768 KB Output is correct
40 Correct 9 ms 768 KB Output is correct
41 Correct 8 ms 768 KB Output is correct
42 Correct 8 ms 768 KB Output is correct
43 Correct 8 ms 820 KB Output is correct
44 Correct 10 ms 768 KB Output is correct
45 Correct 10 ms 768 KB Output is correct
46 Correct 10 ms 768 KB Output is correct
47 Correct 10 ms 768 KB Output is correct
48 Correct 10 ms 768 KB Output is correct
49 Correct 8 ms 768 KB Output is correct
50 Correct 7 ms 768 KB Output is correct
51 Correct 8 ms 768 KB Output is correct
52 Correct 8 ms 768 KB Output is correct
53 Correct 8 ms 768 KB Output is correct
54 Correct 7 ms 768 KB Output is correct
55 Correct 6 ms 768 KB Output is correct
56 Correct 7 ms 768 KB Output is correct
57 Correct 6 ms 768 KB Output is correct
58 Correct 6 ms 768 KB Output is correct
59 Correct 359 ms 2304 KB Output is correct
60 Correct 331 ms 2304 KB Output is correct
61 Correct 320 ms 2304 KB Output is correct
62 Correct 363 ms 2428 KB Output is correct
63 Correct 349 ms 2392 KB Output is correct
64 Correct 646 ms 2424 KB Output is correct
65 Correct 645 ms 2400 KB Output is correct
66 Correct 635 ms 2424 KB Output is correct
67 Correct 655 ms 2424 KB Output is correct
68 Correct 650 ms 2304 KB Output is correct
69 Correct 360 ms 2424 KB Output is correct
70 Correct 390 ms 2304 KB Output is correct
71 Correct 380 ms 2424 KB Output is correct
72 Correct 397 ms 2424 KB Output is correct
73 Correct 376 ms 2424 KB Output is correct
74 Correct 73 ms 2304 KB Output is correct
75 Correct 78 ms 2432 KB Output is correct
76 Correct 82 ms 2304 KB Output is correct
77 Correct 73 ms 2304 KB Output is correct
78 Correct 74 ms 2432 KB Output is correct