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Submission #996788

# Submission time Handle Problem Language Result Execution time Memory
996788 2024-06-11T08:18:07 Z siewjh Trains (BOI24_trains) C++17
100 / 100
 142 ms 119848 KB 
#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
const int MAXN = 100355;
int suff[350][MAXN], ans[MAXN];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int nums; cin >> nums;
	vector<int> step(nums + 1), stop(nums + 1);
	for (int i = 1; i <= nums; i++){
		int amt; cin >> step[i] >> amt;
		if (step[i] != 0){
			amt = min(amt, (nums - i) / step[i]);
			stop[i] = i + amt * step[i];
		}
	}
	int bsz = 300;
	for (int i = nums; i >= 1; i--){
		ans[i] = 1;
		int ssz = step[i];
		if (ssz > bsz){
			for (int x = stop[i]; x > i; x -= ssz) ans[i] = (ans[i] + ans[x]) % mod;
		}
		else if (ssz != 0){
			ans[i] = (ans[i] + suff[ssz][i + ssz] - suff[ssz][stop[i] + ssz] + mod) % mod;
		}
		for (int x = 1; x <= bsz; x++) suff[x][i] = (suff[x][i + x] + ans[i]) % mod;
	}
	cout << ans[1];
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1884 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 2 ms 1880 KB Output is correct
12 Correct 2 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 1 ms 1880 KB Output is correct
15 Correct 1 ms 1884 KB Output is correct
16 Correct 1 ms 1884 KB Output is correct
17 Correct 1 ms 1884 KB Output is correct
18 Correct 1 ms 1884 KB Output is correct
19 Correct 1 ms 1884 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1884 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 2 ms 1880 KB Output is correct
12 Correct 2 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 1 ms 1880 KB Output is correct
15 Correct 1 ms 1884 KB Output is correct
16 Correct 1 ms 1884 KB Output is correct
17 Correct 1 ms 1884 KB Output is correct
18 Correct 1 ms 1884 KB Output is correct
19 Correct 1 ms 1884 KB Output is correct
20 Correct 10 ms 11612 KB Output is correct
21 Correct 5 ms 5208 KB Output is correct
22 Correct 12 ms 13660 KB Output is correct
23 Correct 8 ms 9504 KB Output is correct
24 Correct 6 ms 6492 KB Output is correct
25 Correct 12 ms 12376 KB Output is correct
26 Correct 6 ms 7260 KB Output is correct
27 Correct 10 ms 11984 KB Output is correct
28 Correct 11 ms 13660 KB Output is correct
29 Correct 12 ms 13600 KB Output is correct
30 Correct 14 ms 13656 KB Output is correct
31 Correct 12 ms 13660 KB Output is correct
32 Correct 12 ms 13464 KB Output is correct
33 Correct 12 ms 13660 KB Output is correct
34 Correct 13 ms 13660 KB Output is correct
35 Correct 14 ms 13660 KB Output is correct
36 Correct 12 ms 13660 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1884 KB Output is correct
2 Correct 8 ms 9564 KB Output is correct
3 Correct 6 ms 7268 KB Output is correct
4 Correct 11 ms 11864 KB Output is correct
5 Correct 85 ms 94008 KB Output is correct
6 Correct 115 ms 119636 KB Output is correct
7 Correct 114 ms 119680 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 2 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 12 ms 13596 KB Output is correct
12 Correct 108 ms 119800 KB Output is correct
13 Correct 1 ms 1880 KB Output is correct
14 Correct 14 ms 13472 KB Output is correct
15 Correct 111 ms 119752 KB Output is correct

Subtask #4
34.0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 59984 KB Output is correct
2 Correct 45 ms 49204 KB Output is correct
3 Correct 111 ms 119636 KB Output is correct
4 Correct 85 ms 87376 KB Output is correct
5 Correct 1 ms 1880 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 12 ms 13592 KB Output is correct
8 Correct 113 ms 119680 KB Output is correct

Subtask #5
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1884 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 2 ms 1880 KB Output is correct
12 Correct 2 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 1 ms 1880 KB Output is correct
15 Correct 1 ms 1884 KB Output is correct
16 Correct 1 ms 1884 KB Output is correct
17 Correct 1 ms 1884 KB Output is correct
18 Correct 1 ms 1884 KB Output is correct
19 Correct 1 ms 1884 KB Output is correct
20 Correct 10 ms 11612 KB Output is correct
21 Correct 5 ms 5208 KB Output is correct
22 Correct 12 ms 13660 KB Output is correct
23 Correct 8 ms 9504 KB Output is correct
24 Correct 6 ms 6492 KB Output is correct
25 Correct 12 ms 12376 KB Output is correct
26 Correct 6 ms 7260 KB Output is correct
27 Correct 10 ms 11984 KB Output is correct
28 Correct 11 ms 13660 KB Output is correct
29 Correct 12 ms 13600 KB Output is correct
30 Correct 14 ms 13656 KB Output is correct
31 Correct 12 ms 13660 KB Output is correct
32 Correct 12 ms 13464 KB Output is correct
33 Correct 12 ms 13660 KB Output is correct
34 Correct 13 ms 13660 KB Output is correct
35 Correct 14 ms 13660 KB Output is correct
36 Correct 12 ms 13660 KB Output is correct
37 Correct 1 ms 1884 KB Output is correct
38 Correct 8 ms 9564 KB Output is correct
39 Correct 6 ms 7268 KB Output is correct
40 Correct 11 ms 11864 KB Output is correct
41 Correct 85 ms 94008 KB Output is correct
42 Correct 115 ms 119636 KB Output is correct
43 Correct 114 ms 119680 KB Output is correct
44 Correct 1 ms 1884 KB Output is correct
45 Correct 2 ms 1884 KB Output is correct
46 Correct 1 ms 1884 KB Output is correct
47 Correct 12 ms 13596 KB Output is correct
48 Correct 108 ms 119800 KB Output is correct
49 Correct 1 ms 1880 KB Output is correct
50 Correct 14 ms 13472 KB Output is correct
51 Correct 111 ms 119752 KB Output is correct
52 Correct 54 ms 59984 KB Output is correct
53 Correct 45 ms 49204 KB Output is correct
54 Correct 111 ms 119636 KB Output is correct
55 Correct 85 ms 87376 KB Output is correct
56 Correct 1 ms 1880 KB Output is correct
57 Correct 1 ms 1884 KB Output is correct
58 Correct 12 ms 13592 KB Output is correct
59 Correct 113 ms 119680 KB Output is correct
60 Correct 92 ms 101020 KB Output is correct
61 Correct 107 ms 119636 KB Output is correct
62 Correct 107 ms 119632 KB Output is correct
63 Correct 115 ms 119720 KB Output is correct
64 Correct 115 ms 119636 KB Output is correct
65 Correct 136 ms 119780 KB Output is correct
66 Correct 114 ms 119632 KB Output is correct
67 Correct 117 ms 119636 KB Output is correct
68 Correct 110 ms 119632 KB Output is correct
69 Correct 123 ms 119660 KB Output is correct
70 Correct 107 ms 119632 KB Output is correct
71 Correct 142 ms 119848 KB Output is correct
72 Correct 117 ms 119632 KB Output is correct