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Submission #760541

# Submission time Handle Problem Language Result Execution time Memory
760541 2023-06-17T18:26:32 Z Username4132 Boat (APIO16_boat) C++14
100 / 100
 480 ms 2920 KB 
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
using ll = long long;
#define forn(i, n) for(int i=0; i<(int)n; ++i)
#define dforn(i, n) for(int i=n-1; i>=0; --i)
#define PB push_back

const int MAXN=510, MOD=1000000007;
int n, le[MAXN], ri[MAXN], arr[2*MAXN][MAXN], inv[MAXN];
bool adj[2*MAXN][MAXN];
vector<int> pt;

ll ex(ll b, int e){
    ll ret=1;
    while(e>0){
        if(e&1) ret=(ret*b)%MOD;
        b = (b*b)%MOD;
        e>>=1;
    }
    return ret;
}

int main(){
    scanf("%d", &n);
    forn(i, n+2) inv[i]=ex(i, MOD-2);
    forn(i, n) scanf("%d %d", le+i, ri+i), pt.PB(le[i]), pt.PB(ri[i]+1);
    sort(pt.begin(), pt.end());
    pt.erase(unique(pt.begin(), pt.end()), pt.end());
    forn(i, n){
        auto itr = lower_bound(pt.begin(),  pt.end(), le[i]);
        for(; itr!=pt.end() && (*itr)<=ri[i]; ++itr) adj[itr-pt.begin()][i]=true;
    }
    forn(i, pt.size()-1){
        forn(j, n){
            arr[i+1][j]=(arr[i][j]-(j==0? 0 : arr[i][j-1]) + MOD)%MOD;
            if(adj[i][j]){
                int cnt=0, m=pt[i+1]-pt[i];
                ll comb=m;
                dforn(k, j){
                    int dif = (arr[i][k] - (k==0? 0 : arr[i][k-1]) + MOD)%MOD;
                    arr[i+1][j]=(arr[i+1][j] + comb*dif)%MOD;
                    if(adj[i][k]){
                        ++cnt;
                        comb=(((comb*(m+cnt))%MOD)*((ll)inv[cnt+1]))%MOD;
                    }
                }
                arr[i+1][j]=(arr[i+1][j]+comb)%MOD;
            }
        }
        forn(j, n-1) arr[i+1][j+1]=(arr[i+1][j+1]+arr[i+1][j])%MOD;
    }
    printf("%d\n", arr[pt.size()-1][n-1]);
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
boat.cpp:28:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     forn(i, n) scanf("%d %d", le+i, ri+i), pt.PB(le[i]), pt.PB(ri[i]+1);
      |                ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2772 KB Output is correct
2 Correct 6 ms 2772 KB Output is correct
3 Correct 5 ms 2772 KB Output is correct
4 Correct 5 ms 2772 KB Output is correct
5 Correct 4 ms 2768 KB Output is correct
6 Correct 5 ms 2772 KB Output is correct
7 Correct 5 ms 2772 KB Output is correct
8 Correct 5 ms 2772 KB Output is correct
9 Correct 4 ms 2772 KB Output is correct
10 Correct 4 ms 2772 KB Output is correct
11 Correct 4 ms 2772 KB Output is correct
12 Correct 5 ms 2772 KB Output is correct
13 Correct 4 ms 2772 KB Output is correct
14 Correct 4 ms 2772 KB Output is correct
15 Correct 4 ms 2772 KB Output is correct
16 Correct 2 ms 724 KB Output is correct
17 Correct 2 ms 724 KB Output is correct
18 Correct 2 ms 724 KB Output is correct
19 Correct 2 ms 724 KB Output is correct
20 Correct 2 ms 724 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2772 KB Output is correct
2 Correct 6 ms 2772 KB Output is correct
3 Correct 5 ms 2772 KB Output is correct
4 Correct 5 ms 2772 KB Output is correct
5 Correct 4 ms 2768 KB Output is correct
6 Correct 5 ms 2772 KB Output is correct
7 Correct 5 ms 2772 KB Output is correct
8 Correct 5 ms 2772 KB Output is correct
9 Correct 4 ms 2772 KB Output is correct
10 Correct 4 ms 2772 KB Output is correct
11 Correct 4 ms 2772 KB Output is correct
12 Correct 5 ms 2772 KB Output is correct
13 Correct 4 ms 2772 KB Output is correct
14 Correct 4 ms 2772 KB Output is correct
15 Correct 4 ms 2772 KB Output is correct
16 Correct 2 ms 724 KB Output is correct
17 Correct 2 ms 724 KB Output is correct
18 Correct 2 ms 724 KB Output is correct
19 Correct 2 ms 724 KB Output is correct
20 Correct 2 ms 724 KB Output is correct
21 Correct 212 ms 2568 KB Output is correct
22 Correct 205 ms 2552 KB Output is correct
23 Correct 199 ms 2560 KB Output is correct
24 Correct 216 ms 2508 KB Output is correct
25 Correct 203 ms 2468 KB Output is correct
26 Correct 416 ms 2508 KB Output is correct
27 Correct 444 ms 2440 KB Output is correct
28 Correct 417 ms 2424 KB Output is correct
29 Correct 414 ms 2400 KB Output is correct
30 Correct 6 ms 2772 KB Output is correct
31 Correct 5 ms 2756 KB Output is correct
32 Correct 6 ms 2772 KB Output is correct
33 Correct 6 ms 2772 KB Output is correct
34 Correct 6 ms 2772 KB Output is correct
35 Correct 6 ms 2772 KB Output is correct
36 Correct 6 ms 2712 KB Output is correct
37 Correct 6 ms 2772 KB Output is correct
38 Correct 5 ms 2756 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 724 KB Output is correct
2 Correct 2 ms 724 KB Output is correct
3 Correct 2 ms 724 KB Output is correct
4 Correct 3 ms 724 KB Output is correct
5 Correct 3 ms 724 KB Output is correct
6 Correct 4 ms 724 KB Output is correct
7 Correct 4 ms 724 KB Output is correct
8 Correct 4 ms 724 KB Output is correct
9 Correct 4 ms 724 KB Output is correct
10 Correct 5 ms 724 KB Output is correct
11 Correct 3 ms 724 KB Output is correct
12 Correct 2 ms 724 KB Output is correct
13 Correct 2 ms 724 KB Output is correct
14 Correct 2 ms 724 KB Output is correct
15 Correct 2 ms 724 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 2 ms 596 KB Output is correct
19 Correct 2 ms 592 KB Output is correct
20 Correct 2 ms 596 KB Output is correct

Subtask #4
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2772 KB Output is correct
2 Correct 6 ms 2772 KB Output is correct
3 Correct 5 ms 2772 KB Output is correct
4 Correct 5 ms 2772 KB Output is correct
5 Correct 4 ms 2768 KB Output is correct
6 Correct 5 ms 2772 KB Output is correct
7 Correct 5 ms 2772 KB Output is correct
8 Correct 5 ms 2772 KB Output is correct
9 Correct 4 ms 2772 KB Output is correct
10 Correct 4 ms 2772 KB Output is correct
11 Correct 4 ms 2772 KB Output is correct
12 Correct 5 ms 2772 KB Output is correct
13 Correct 4 ms 2772 KB Output is correct
14 Correct 4 ms 2772 KB Output is correct
15 Correct 4 ms 2772 KB Output is correct
16 Correct 2 ms 724 KB Output is correct
17 Correct 2 ms 724 KB Output is correct
18 Correct 2 ms 724 KB Output is correct
19 Correct 2 ms 724 KB Output is correct
20 Correct 2 ms 724 KB Output is correct
21 Correct 212 ms 2568 KB Output is correct
22 Correct 205 ms 2552 KB Output is correct
23 Correct 199 ms 2560 KB Output is correct
24 Correct 216 ms 2508 KB Output is correct
25 Correct 203 ms 2468 KB Output is correct
26 Correct 416 ms 2508 KB Output is correct
27 Correct 444 ms 2440 KB Output is correct
28 Correct 417 ms 2424 KB Output is correct
29 Correct 414 ms 2400 KB Output is correct
30 Correct 6 ms 2772 KB Output is correct
31 Correct 5 ms 2756 KB Output is correct
32 Correct 6 ms 2772 KB Output is correct
33 Correct 6 ms 2772 KB Output is correct
34 Correct 6 ms 2772 KB Output is correct
35 Correct 6 ms 2772 KB Output is correct
36 Correct 6 ms 2712 KB Output is correct
37 Correct 6 ms 2772 KB Output is correct
38 Correct 5 ms 2756 KB Output is correct
39 Correct 2 ms 724 KB Output is correct
40 Correct 2 ms 724 KB Output is correct
41 Correct 2 ms 724 KB Output is correct
42 Correct 3 ms 724 KB Output is correct
43 Correct 3 ms 724 KB Output is correct
44 Correct 4 ms 724 KB Output is correct
45 Correct 4 ms 724 KB Output is correct
46 Correct 4 ms 724 KB Output is correct
47 Correct 4 ms 724 KB Output is correct
48 Correct 5 ms 724 KB Output is correct
49 Correct 3 ms 724 KB Output is correct
50 Correct 2 ms 724 KB Output is correct
51 Correct 2 ms 724 KB Output is correct
52 Correct 2 ms 724 KB Output is correct
53 Correct 2 ms 724 KB Output is correct
54 Correct 2 ms 596 KB Output is correct
55 Correct 1 ms 596 KB Output is correct
56 Correct 2 ms 596 KB Output is correct
57 Correct 2 ms 592 KB Output is correct
58 Correct 2 ms 596 KB Output is correct
59 Correct 240 ms 2708 KB Output is correct
60 Correct 218 ms 2728 KB Output is correct
61 Correct 203 ms 2796 KB Output is correct
62 Correct 235 ms 2860 KB Output is correct
63 Correct 221 ms 2792 KB Output is correct
64 Correct 479 ms 2856 KB Output is correct
65 Correct 477 ms 2720 KB Output is correct
66 Correct 479 ms 2812 KB Output is correct
67 Correct 480 ms 2756 KB Output is correct
68 Correct 476 ms 2892 KB Output is correct
69 Correct 188 ms 2724 KB Output is correct
70 Correct 201 ms 2920 KB Output is correct
71 Correct 186 ms 2808 KB Output is correct
72 Correct 200 ms 2800 KB Output is correct
73 Correct 217 ms 2740 KB Output is correct
74 Correct 45 ms 728 KB Output is correct
75 Correct 43 ms 712 KB Output is correct
76 Correct 45 ms 700 KB Output is correct
77 Correct 45 ms 712 KB Output is correct
78 Correct 56 ms 756 KB Output is correct