Submission #699441

#	Time	Username	Problem	Language	Result	Execution time	Memory
699441		aelf2k23	초음속철도 (OJUZ11_rail)	C++14	45 / 100	3100 ms	7888 KiB

rail

#include<bits/stdc++.h>
#define int long long
#define ll long long
#define fr first
#define sc second
#define all(s) s.begin(), s.end()
using namespace std;

const int nmax = 400005;

const int mod = 1e9 + 7;

int n, m, dp[nmax];
pair<int,int> a[nmax];

vector<int>vecc;

int32_t main(){
    cin >> n >> m;
    for(int i=1;i<=m;i++){
        cin >> a[i].fr >> a[i].sc;
        swap(a[i].fr, a[i].sc);
        vecc.push_back(a[i].fr);
        vecc.push_back(a[i].sc);
    }
    vecc.push_back(n);

    sort(all(vecc));
    vecc.resize(unique(all(vecc)) - vecc.begin());

    for(int i=1;i<=m;i++){
        a[i].fr = lower_bound(all(vecc), a[i].fr) - vecc.begin();
        a[i].sc = lower_bound(all(vecc), a[i].sc) - vecc.begin();
    }

    sort(a + 1, a + m + 1);
    for(int i=1;i<=m;i++){
        swap(a[i].fr, a[i].sc);
    }
    int nn = vecc.size() - 1;

    dp[0] = 1;

    for(int i=1;i<=m;i++){
        for(int j=0;j<a[i].fr;j++){
            dp[j] = dp[j] * 2LL % mod;
        }
        for(int j=a[i].sc;j>=a[i].fr;j--){
            dp[a[i].sc] = (dp[a[i].sc] + dp[j]) % mod;
        }
    }
    

    cout << dp[nn] << '\n';
}

• Subtask 1: 10 / 10
• Subtask 2: 8 / 8
• Subtask 3: 0 / 25
• Subtask 4: 27 / 27
• Subtask 5: 0 / 30