| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 1052873 |
2024-08-11T05:19:01 Z |
vjudge1 |
Trains (BOI24_trains) |
C++17 |
|
167 ms |
3440 KB |
#include <bits/stdc++.h>
using namespace std;
#define int long long
int const N=1e5+5;
int const mod=1e9+7;
int dp[N],suf[N],d[N],x[N];
int n;
void solve12(){
dp[n]=1;
for(int i=n-1;i>=1;i--){
dp[i]=1;
if(d[i]==0)
continue;
for(int j=i+d[i];j<=min(i+(d[i]*x[i]),n);j+=d[i])
dp[i]=(dp[i]+dp[j])%mod;
}
cout<<dp[1]<<endl;
}
void solve3(){
dp[n]=1;
suf[n]=1;
for(int i=n-1;i>=1;i--){
dp[i]=(((1+suf[i+1]-suf[min(n+1,i+x[i]+1)])%mod)+mod)%mod;
suf[i]=(dp[i]+suf[i+1])%mod;
}
cout<<dp[1]<<endl;
}
signed main(){
cin>>n;
bool b=1;
for (int i = 1; i <=n; ++i){
cin>>d[i]>>x[i];
if(d[i]!=1)
b=0;
}
if(n<=10000)
solve12();
else if(b)
solve3();
// else
// solve4();
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
1 ms |
2420 KB |
Output is correct |
| 7 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 19 |
Correct |
0 ms |
2396 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
1 ms |
2420 KB |
Output is correct |
| 7 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 19 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 20 |
Correct |
12 ms |
2612 KB |
Output is correct |
| 21 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 22 |
Correct |
3 ms |
2652 KB |
Output is correct |
| 23 |
Correct |
60 ms |
2576 KB |
Output is correct |
| 24 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 25 |
Correct |
6 ms |
2396 KB |
Output is correct |
| 26 |
Correct |
34 ms |
2396 KB |
Output is correct |
| 27 |
Correct |
121 ms |
2596 KB |
Output is correct |
| 28 |
Correct |
21 ms |
2396 KB |
Output is correct |
| 29 |
Correct |
166 ms |
2592 KB |
Output is correct |
| 30 |
Correct |
4 ms |
2652 KB |
Output is correct |
| 31 |
Correct |
83 ms |
2616 KB |
Output is correct |
| 32 |
Correct |
166 ms |
2392 KB |
Output is correct |
| 33 |
Correct |
4 ms |
2648 KB |
Output is correct |
| 34 |
Correct |
3 ms |
2648 KB |
Output is correct |
| 35 |
Correct |
2 ms |
2648 KB |
Output is correct |
| 36 |
Correct |
10 ms |
2652 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
62 ms |
2564 KB |
Output is correct |
| 3 |
Correct |
34 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
121 ms |
2600 KB |
Output is correct |
| 5 |
Correct |
14 ms |
3164 KB |
Output is correct |
| 6 |
Correct |
34 ms |
3412 KB |
Output is correct |
| 7 |
Correct |
28 ms |
3440 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
166 ms |
2600 KB |
Output is correct |
| 12 |
Correct |
29 ms |
3412 KB |
Output is correct |
| 13 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 14 |
Correct |
167 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
27 ms |
3420 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
17 ms |
2652 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
1 ms |
2420 KB |
Output is correct |
| 7 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 13 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 15 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 18 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 19 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 20 |
Correct |
12 ms |
2612 KB |
Output is correct |
| 21 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 22 |
Correct |
3 ms |
2652 KB |
Output is correct |
| 23 |
Correct |
60 ms |
2576 KB |
Output is correct |
| 24 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 25 |
Correct |
6 ms |
2396 KB |
Output is correct |
| 26 |
Correct |
34 ms |
2396 KB |
Output is correct |
| 27 |
Correct |
121 ms |
2596 KB |
Output is correct |
| 28 |
Correct |
21 ms |
2396 KB |
Output is correct |
| 29 |
Correct |
166 ms |
2592 KB |
Output is correct |
| 30 |
Correct |
4 ms |
2652 KB |
Output is correct |
| 31 |
Correct |
83 ms |
2616 KB |
Output is correct |
| 32 |
Correct |
166 ms |
2392 KB |
Output is correct |
| 33 |
Correct |
4 ms |
2648 KB |
Output is correct |
| 34 |
Correct |
3 ms |
2648 KB |
Output is correct |
| 35 |
Correct |
2 ms |
2648 KB |
Output is correct |
| 36 |
Correct |
10 ms |
2652 KB |
Output is correct |
| 37 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 38 |
Correct |
62 ms |
2564 KB |
Output is correct |
| 39 |
Correct |
34 ms |
2396 KB |
Output is correct |
| 40 |
Correct |
121 ms |
2600 KB |
Output is correct |
| 41 |
Correct |
14 ms |
3164 KB |
Output is correct |
| 42 |
Correct |
34 ms |
3412 KB |
Output is correct |
| 43 |
Correct |
28 ms |
3440 KB |
Output is correct |
| 44 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 45 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 46 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 47 |
Correct |
166 ms |
2600 KB |
Output is correct |
| 48 |
Correct |
29 ms |
3412 KB |
Output is correct |
| 49 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 50 |
Correct |
167 ms |
2396 KB |
Output is correct |
| 51 |
Correct |
27 ms |
3420 KB |
Output is correct |
| 52 |
Incorrect |
17 ms |
2652 KB |
Output isn't correct |
| 53 |
Halted |
0 ms |
0 KB |
- |
