Submission #1053232

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053232		mindiyak	Trains (BOI24_trains)	C++14	0 / 100	5 ms	2312 KiB

Main

#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (ll i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int M = 1e9+7;
void init(string name)
{
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}

int add(int a,int b){
    a += b;
    if(a<0)a+=M;
    return a%M;
}

void solve()
{
    int N;cin >> N;
    vi d(N), t(N);
    vi dp(N+4,0);

    FOR(i,0,N){
        int a,b;cin >> a >> b;
        d[i] = a;t[i] = b;
    }

    priority_queue<pi> pq;
    int sum = 1,cnt = 1;
    // dp[0] = 1;
    FOR(i,0,N){
        pq.push({-(i+t[i]),cnt});
        cnt = add(cnt,dp[i]);
        // cout << i << " " << pq.top().F << " | " <<  pq.top().S << " " << cnt << " ";
        if(-pq.top().F == i){
            cnt = add(cnt,-pq.top().S);
            pq.pop();
        }

        // cout << cnt << endl;
        dp[i+1] = add(cnt,dp[i+1]);

    }
    dp[0] = 1;
    
    // FOR(i,0,N){
    //     cout << dp[i] << " ";
    // }cout << endl;

    int ans = 0;
    FOR(i,0,N)ans = add(ans,dp[i]);

    cout << ans << endl;
}   


int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:71:9: warning: unused variable 'sum' [-Wunused-variable]
   71 |     int sum = 1,cnt = 1;
      |         ^~~
Main.cpp: In function 'void init(std::string)':
Main.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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