제출 #1275375

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1275375		vibeduck	Trains (BOI24_trains)	C++20	34 / 100	559 ms	5008 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

inline void solve() {
    int n; cin >> n;
    vi d(n + 1), x(n + 1);
    for (int i = 1; i <= n; i++) cin >> d[i] >> x[i];
    vi dp(n + 1); dp[1] = 1;

    // O(n^2) dp
    // for (int i = 2; i <= n; i++) {
    //     for (int j = i - 1; j >= 0; j--) {
    //         if (a[j].fi == 0) continue;
    //         if (((i - j) % a[j].fi) == 0 && (i - j) / a[j].fi <= a[j].se) {
    //             dp[i] += dp[j];
    //             dp[i] %= mod;
    //         }
    //     }
    // }

    // x[i] = 1e9
    unordered_map<int, umii> m; // m[number][mod]
    for (int i = 1; i <= n; i++) {

        // add necessary
        for (int j = 1; j <= (int)sqrt(n); j++) {
            dp[i] += m[j][(i % j)];
            dp[i] %= mod;
        }

        if (!d[i]) continue;

        if (d[i] <= (int)(sqrt(n))) {
            m[d[i]][i % d[i]] += dp[i];
            m[d[i]][i % d[i]] %= mod;
        } else {
            for (int j = i + d[i]; j <= n; j += d[i]) {
                dp[j] += dp[i];
                dp[j] %= mod;
            }
        }
    }

    cout << accumulate(all(dp), (int)0) % mod << '\n';
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:77:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:78:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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