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Submission #995301

# Submission time Handle Problem Language Result Execution time Memory
995301 2024-06-08T19:27:35 Z PagodePaiva Trains (BOI24_trains) C++17
34 / 100
 149 ms 3020 KB 
#include<bits/stdc++.h>

using namespace std;

const int N = 1e5+10;
const int B = 600;
int n;
int d[N], x[N], dp[N];
int pref[B][B];
const int mod = 1e9+7;

void calc(int pos){
    if(d[pos] == 0) return;
    int comp = x[pos];
    comp = min(comp, (n-pos)/d[pos]);
    //cout << pos << ' ' << comp << ' ';
    if(d[pos] >= B){
        for(int i = 1;i <= comp;i++){
            dp[pos] += dp[pos+d[pos]*i];
            dp[pos] %= mod;
        }
        return;
    }
    else{
        dp[pos] += pref[d[pos]][pos % d[pos]];
        dp[pos] %= mod;
        return;
    }
}

void upd(int pos){
    for(int i = 1;i < B;i++){
        pref[i][pos % i] += dp[pos];
        pref[i][pos % i] %= mod;
    }
    return;
}

int main(){
    ios::sync_with_stdio(false); cin.tie(0);
    cin >> n;
    for(int i = 1;i <= n;i++){
        cin >> d[i] >> x[i];
    }
    for(int i = 1;i <= n;i++){
        dp[i] = 1;
    }
    for(int i = n;i >= 1;i--){
        calc(i);
        upd(i);
    }
    cout << dp[1] << '\n';
    return 0;
}

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
34.0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 66 ms 2824 KB Output is correct
2 Correct 57 ms 2792 KB Output is correct
3 Correct 149 ms 3020 KB Output is correct
4 Correct 98 ms 2904 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2652 KB Output is correct
7 Correct 14 ms 2648 KB Output is correct
8 Correct 138 ms 3020 KB Output is correct

Subtask #5
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -