#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 7;
typedef long long ll;
ll sumLast(vector<ll>& suf, int x){
if(x >= (int)suf.size()) return suf.back();
if(!x) return 0;
return (suf.back() + MOD - suf[(int)suf.size() - x - 1]) % MOD;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
int N; cin >> N;
vector<int> x(N), d(N);
for(int i = 0; i < N; i++){
cin >> d[i] >> x[i];
}
int sqr = sqrt(N);
vector<vector<vector<ll>>> suffix(sqr);
//It's efficiente because each index will be in sqrt vectors.
for(int i = 1; i < sqr; i++){
suffix[i].assign(i, {0});
}
vector<ll> dp(N, 0);
for(int i = N - 1; i >= 0; i--){
dp[i]++; //Just ending there.
if(d[i] >= sqr){
int curr = i + d[i];
int currMult = 1;
while(curr < N && currMult <= x[i]){
dp[i] += dp[curr]; dp[i] %= MOD;
currMult++;
curr += d[i];
}
}else if(d[i] > 0){
int md = i % d[i];
//I want the sum of the last x ones.
dp[i] += sumLast(suffix[d[i]][md], x[i]);
dp[i] %= MOD;
}
for(int div = 1; div < sqr; div++){
int md = i % div;
suffix[div][md].push_back((suffix[div][md].back() + dp[i]) % MOD);
}
}
cout << dp[0] << "\n";
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
344 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
344 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
12 ms |
9308 KB |
Output is correct |
21 |
Correct |
2 ms |
2396 KB |
Output is correct |
22 |
Correct |
15 ms |
12044 KB |
Output is correct |
23 |
Correct |
7 ms |
6488 KB |
Output is correct |
24 |
Correct |
4 ms |
3672 KB |
Output is correct |
25 |
Correct |
13 ms |
10332 KB |
Output is correct |
26 |
Correct |
4 ms |
4188 KB |
Output is correct |
27 |
Correct |
11 ms |
9560 KB |
Output is correct |
28 |
Correct |
15 ms |
12224 KB |
Output is correct |
29 |
Correct |
19 ms |
12136 KB |
Output is correct |
30 |
Correct |
15 ms |
12100 KB |
Output is correct |
31 |
Correct |
16 ms |
12120 KB |
Output is correct |
32 |
Correct |
14 ms |
12124 KB |
Output is correct |
33 |
Correct |
15 ms |
12240 KB |
Output is correct |
34 |
Correct |
14 ms |
12124 KB |
Output is correct |
35 |
Correct |
18 ms |
12124 KB |
Output is correct |
36 |
Correct |
20 ms |
12124 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
7 ms |
6492 KB |
Output is correct |
3 |
Correct |
4 ms |
4188 KB |
Output is correct |
4 |
Correct |
13 ms |
9564 KB |
Output is correct |
5 |
Correct |
362 ms |
250232 KB |
Output is correct |
6 |
Correct |
515 ms |
357956 KB |
Output is correct |
7 |
Correct |
518 ms |
357952 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
18 ms |
12100 KB |
Output is correct |
12 |
Correct |
524 ms |
357844 KB |
Output is correct |
13 |
Correct |
0 ms |
344 KB |
Output is correct |
14 |
Correct |
15 ms |
12168 KB |
Output is correct |
15 |
Correct |
533 ms |
357836 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
174 ms |
122056 KB |
Output is correct |
2 |
Correct |
131 ms |
91716 KB |
Output is correct |
3 |
Correct |
532 ms |
357952 KB |
Output is correct |
4 |
Correct |
344 ms |
225068 KB |
Output is correct |
5 |
Correct |
1 ms |
344 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
15 ms |
12240 KB |
Output is correct |
8 |
Correct |
516 ms |
357912 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
344 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
12 ms |
9308 KB |
Output is correct |
21 |
Correct |
2 ms |
2396 KB |
Output is correct |
22 |
Correct |
15 ms |
12044 KB |
Output is correct |
23 |
Correct |
7 ms |
6488 KB |
Output is correct |
24 |
Correct |
4 ms |
3672 KB |
Output is correct |
25 |
Correct |
13 ms |
10332 KB |
Output is correct |
26 |
Correct |
4 ms |
4188 KB |
Output is correct |
27 |
Correct |
11 ms |
9560 KB |
Output is correct |
28 |
Correct |
15 ms |
12224 KB |
Output is correct |
29 |
Correct |
19 ms |
12136 KB |
Output is correct |
30 |
Correct |
15 ms |
12100 KB |
Output is correct |
31 |
Correct |
16 ms |
12120 KB |
Output is correct |
32 |
Correct |
14 ms |
12124 KB |
Output is correct |
33 |
Correct |
15 ms |
12240 KB |
Output is correct |
34 |
Correct |
14 ms |
12124 KB |
Output is correct |
35 |
Correct |
18 ms |
12124 KB |
Output is correct |
36 |
Correct |
20 ms |
12124 KB |
Output is correct |
37 |
Correct |
0 ms |
348 KB |
Output is correct |
38 |
Correct |
7 ms |
6492 KB |
Output is correct |
39 |
Correct |
4 ms |
4188 KB |
Output is correct |
40 |
Correct |
13 ms |
9564 KB |
Output is correct |
41 |
Correct |
362 ms |
250232 KB |
Output is correct |
42 |
Correct |
515 ms |
357956 KB |
Output is correct |
43 |
Correct |
518 ms |
357952 KB |
Output is correct |
44 |
Correct |
0 ms |
348 KB |
Output is correct |
45 |
Correct |
0 ms |
348 KB |
Output is correct |
46 |
Correct |
0 ms |
348 KB |
Output is correct |
47 |
Correct |
18 ms |
12100 KB |
Output is correct |
48 |
Correct |
524 ms |
357844 KB |
Output is correct |
49 |
Correct |
0 ms |
344 KB |
Output is correct |
50 |
Correct |
15 ms |
12168 KB |
Output is correct |
51 |
Correct |
533 ms |
357836 KB |
Output is correct |
52 |
Correct |
174 ms |
122056 KB |
Output is correct |
53 |
Correct |
131 ms |
91716 KB |
Output is correct |
54 |
Correct |
532 ms |
357952 KB |
Output is correct |
55 |
Correct |
344 ms |
225068 KB |
Output is correct |
56 |
Correct |
1 ms |
344 KB |
Output is correct |
57 |
Correct |
0 ms |
348 KB |
Output is correct |
58 |
Correct |
15 ms |
12240 KB |
Output is correct |
59 |
Correct |
516 ms |
357912 KB |
Output is correct |
60 |
Correct |
439 ms |
277640 KB |
Output is correct |
61 |
Correct |
545 ms |
357884 KB |
Output is correct |
62 |
Correct |
519 ms |
357976 KB |
Output is correct |
63 |
Correct |
602 ms |
357952 KB |
Output is correct |
64 |
Correct |
516 ms |
357968 KB |
Output is correct |
65 |
Correct |
569 ms |
358000 KB |
Output is correct |
66 |
Correct |
515 ms |
357976 KB |
Output is correct |
67 |
Correct |
570 ms |
358024 KB |
Output is correct |
68 |
Correct |
525 ms |
357948 KB |
Output is correct |
69 |
Correct |
542 ms |
357948 KB |
Output is correct |
70 |
Correct |
570 ms |
357924 KB |
Output is correct |
71 |
Correct |
618 ms |
358004 KB |
Output is correct |
72 |
Correct |
523 ms |
357952 KB |
Output is correct |