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Submission #1052852

# Submission time Handle Problem Language Result Execution time Memory
1052852 2024-08-11T04:41:33 Z Faisal_Saqib Trains (BOI24_trains) C++17
16 / 100
 10 ms 3472 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define vll vector<ll>
#define all(x) begin(x),end(x)
#define pb push_back

const int N=1e5+10,mod=1e9+7;
ll ways[N],suf[N],d[N],x[N];
void solve()
{
    ll n;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>d[i]>>x[i];
        ways[i]=1;
    }
    suf[n+1]=0;
    for(int i=n;i>=1;i--)
    {
        int j=min(n,i+x[i]);
        ways[i] =(((suf[i+1]-suf[j+1])%mod)+mod)%mod;
        ways[i] = (ways[i]+1)%mod;
        suf[i]=(suf[i+1]+ways[i])%mod;
    }
    cout<<ways[1]%mod<<endl;
}

int main()
{
	cin.tie(0);cout.tie(0);
	ios::sync_with_stdio(0);
	int t=1;
	// cin>>t;
	while(t--)
		solve();
}

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 5 ms 3164 KB Output is correct
6 Correct 8 ms 3420 KB Output is correct
7 Correct 10 ms 3420 KB Output is correct
8 Correct 1 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 2 ms 2652 KB Output is correct
12 Correct 10 ms 3420 KB Output is correct
13 Correct 0 ms 2396 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 9 ms 3472 KB Output is correct

Subtask #4
0 / 34.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 2908 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -