답안 #723251

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
723251 2023-04-13T12:36:35 Z n0sk1ll Boat (APIO16_boat) C++14
100 / 100
547 ms 464 KB
#include <bits/stdc++.h>

#define FAST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);cerr.tie(0)
#define mp make_pair
#define xx first
#define yy second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define all(x) x.begin(),x.end()
#define ff(i,a,b) for (int i = a; i < b; i++)
#define fff(i,a,b) for (int i = a; i <= b; i++)
#define bff(i,a,b) for (int i = b-1; i >= a; i--)
#define bfff(i,a,b) for (int i = b; i >= a; i--)

using namespace std;
long double typedef ld;
unsigned int typedef ui;
long long int typedef li;
pair<int,int> typedef pii;
pair<li,li> typedef pli;
pair<ld,ld> typedef pld;
vector<vector<int>> typedef graph;
unsigned long long int typedef ull;
//const int mod = 998244353;
const int mod = 1000000007;







//Note to self: Check for overflow

int inv[2005];

int power(int a, int n)
{
    li c=1;
    while (n)
    {
        if (n&1) (c*=a)%=mod;
        a=(li)a*a%mod,n>>=1;
    }
    return c;
}

int a[505],b[505];

int dp[505];

int main()
{
    FAST;

    int n; cin>>n;
    fff(i,1,n) cin>>a[i]>>b[i];

    vector<int> kords;
    kords.pb(0);
    kords.pb(mod);
    fff(i,1,n) kords.pb(a[i]);
    fff(i,1,n) kords.pb(b[i]+1);
    sort(all(kords));
    kords.erase(unique(all(kords)),kords.end());

    dp[0]=1;
    fff(i,1,2000) inv[i]=power(i,mod-2);
    inv[0]=1;

    ff(k,1,(int)kords.size()-1)
    {
        bfff(i,1,n) if (a[i]<=kords[k] && kords[k]<=b[i])
        {
            li binom=1,gore=kords[k+1]-kords[k],dole=0;
            bfff(f,1,i)
            {
                if (a[f]<=kords[k] && kords[k]<=b[f])
                {
                    (binom*=(gore++))%=mod;
                    (binom*=(inv[++dole]))%=mod;
                }
                (dp[i]+=(li)dp[f-1]*binom%mod)%=mod;
            }
        }

        //cout<<kords[k]<<": ";
        //fff(i,1,n) cout<<dp[i]<<" "; cout<<endl;
    }

    int ans=0;
    fff(i,1,n) (ans+=dp[i])%=mod;
    cout<<ans<<"\n";
}

//Note to self: Check for overflow
# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 3 ms 340 KB Output is correct
3 Correct 3 ms 340 KB Output is correct
4 Correct 3 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 348 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 3 ms 340 KB Output is correct
11 Correct 2 ms 244 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 3 ms 344 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 3 ms 340 KB Output is correct
3 Correct 3 ms 340 KB Output is correct
4 Correct 3 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 348 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 3 ms 340 KB Output is correct
11 Correct 2 ms 244 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 3 ms 344 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
21 Correct 252 ms 464 KB Output is correct
22 Correct 246 ms 340 KB Output is correct
23 Correct 222 ms 336 KB Output is correct
24 Correct 232 ms 340 KB Output is correct
25 Correct 265 ms 336 KB Output is correct
26 Correct 455 ms 340 KB Output is correct
27 Correct 469 ms 340 KB Output is correct
28 Correct 484 ms 340 KB Output is correct
29 Correct 451 ms 340 KB Output is correct
30 Correct 3 ms 336 KB Output is correct
31 Correct 3 ms 356 KB Output is correct
32 Correct 3 ms 340 KB Output is correct
33 Correct 4 ms 352 KB Output is correct
34 Correct 3 ms 340 KB Output is correct
35 Correct 4 ms 340 KB Output is correct
36 Correct 4 ms 340 KB Output is correct
37 Correct 4 ms 340 KB Output is correct
38 Correct 4 ms 340 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 212 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 4 ms 340 KB Output is correct
5 Correct 3 ms 324 KB Output is correct
6 Correct 5 ms 212 KB Output is correct
7 Correct 5 ms 212 KB Output is correct
8 Correct 5 ms 340 KB Output is correct
9 Correct 6 ms 336 KB Output is correct
10 Correct 6 ms 340 KB Output is correct
11 Correct 4 ms 332 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 3 ms 212 KB Output is correct
14 Correct 3 ms 212 KB Output is correct
15 Correct 4 ms 332 KB Output is correct
16 Correct 2 ms 212 KB Output is correct
17 Correct 2 ms 332 KB Output is correct
18 Correct 2 ms 212 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 212 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 3 ms 340 KB Output is correct
3 Correct 3 ms 340 KB Output is correct
4 Correct 3 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 348 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 3 ms 340 KB Output is correct
11 Correct 2 ms 244 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 3 ms 344 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
21 Correct 252 ms 464 KB Output is correct
22 Correct 246 ms 340 KB Output is correct
23 Correct 222 ms 336 KB Output is correct
24 Correct 232 ms 340 KB Output is correct
25 Correct 265 ms 336 KB Output is correct
26 Correct 455 ms 340 KB Output is correct
27 Correct 469 ms 340 KB Output is correct
28 Correct 484 ms 340 KB Output is correct
29 Correct 451 ms 340 KB Output is correct
30 Correct 3 ms 336 KB Output is correct
31 Correct 3 ms 356 KB Output is correct
32 Correct 3 ms 340 KB Output is correct
33 Correct 4 ms 352 KB Output is correct
34 Correct 3 ms 340 KB Output is correct
35 Correct 4 ms 340 KB Output is correct
36 Correct 4 ms 340 KB Output is correct
37 Correct 4 ms 340 KB Output is correct
38 Correct 4 ms 340 KB Output is correct
39 Correct 3 ms 212 KB Output is correct
40 Correct 3 ms 332 KB Output is correct
41 Correct 4 ms 340 KB Output is correct
42 Correct 4 ms 340 KB Output is correct
43 Correct 3 ms 324 KB Output is correct
44 Correct 5 ms 212 KB Output is correct
45 Correct 5 ms 212 KB Output is correct
46 Correct 5 ms 340 KB Output is correct
47 Correct 6 ms 336 KB Output is correct
48 Correct 6 ms 340 KB Output is correct
49 Correct 4 ms 332 KB Output is correct
50 Correct 2 ms 340 KB Output is correct
51 Correct 3 ms 212 KB Output is correct
52 Correct 3 ms 212 KB Output is correct
53 Correct 4 ms 332 KB Output is correct
54 Correct 2 ms 212 KB Output is correct
55 Correct 2 ms 332 KB Output is correct
56 Correct 2 ms 212 KB Output is correct
57 Correct 2 ms 340 KB Output is correct
58 Correct 2 ms 212 KB Output is correct
59 Correct 272 ms 340 KB Output is correct
60 Correct 254 ms 340 KB Output is correct
61 Correct 242 ms 460 KB Output is correct
62 Correct 295 ms 340 KB Output is correct
63 Correct 249 ms 340 KB Output is correct
64 Correct 547 ms 340 KB Output is correct
65 Correct 533 ms 340 KB Output is correct
66 Correct 546 ms 340 KB Output is correct
67 Correct 533 ms 340 KB Output is correct
68 Correct 536 ms 340 KB Output is correct
69 Correct 228 ms 340 KB Output is correct
70 Correct 235 ms 340 KB Output is correct
71 Correct 216 ms 340 KB Output is correct
72 Correct 245 ms 340 KB Output is correct
73 Correct 232 ms 340 KB Output is correct
74 Correct 51 ms 340 KB Output is correct
75 Correct 59 ms 332 KB Output is correct
76 Correct 58 ms 340 KB Output is correct
77 Correct 56 ms 340 KB Output is correct
78 Correct 58 ms 340 KB Output is correct