Submission #1051370

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051370		deera	Trains (BOI24_trains)	C++14	21 / 100	2094 ms	2652 KiB

Main

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const ll MOD = 1e9+7;


int main() {
    ll n; cin >> n;

    ll m = n + 100;
    vector<ll> dp(m);
    vector<ll> d(m), x(m);

    for (ll i = 1; i <= n; i++) cin >> d[i] >> x[i];

    for (ll i = 0; i < dp.size(); i++) dp[i] = 1;

    for (ll i = n; i >= 1; i--) {
        if (d[i] == 0) continue;

        ll step = d[i];
        for (ll j = i+step; j <= n && j <= i+step*x[i]; j+=step) {
            dp[i] = (dp[j] + dp[i]) % MOD;
        }
    }

    cout << dp[1] % MOD << endl;
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for (ll i = 0; i < dp.size(); i++) dp[i] = 1;
      |                    ~~^~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 13 / 13
• Subtask 3: 0 / 16
• Subtask 4: 0 / 34
• Subtask 5: 0 / 29