Submission #588368

#	Time	Username	Problem	Language	Result	Execution time	Memory
588368		messiuuuuu	Boat (APIO16_boat)	C++17	31 / 100	604 ms	524288 KiB

boat

#include<bits/stdc++.h>
#define task "C"
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
using namespace std;
const int MAXN = 1e5 + 5;
const ll INF = 1e18 + 5;
const int MOD = 1e9 + 7;

int n;
int a[MAXN], b[MAXN];
vector<int> num;

void Input()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i] >> b[i];
        for (int j = a[i]; j <= b[i]; j++)
            num.pb(j);
    }
}

void NenSo()
{
    sort(num.begin(), num.end());
    num.erase(unique(num.begin(), num.end()), num.end());
}

int nen(int x)
{
    return lower_bound(num.begin(), num.end(), x) - num.begin() + 1;
}

struct BIT
{
    vector<int> fe;
    int sz;
    void Init(int _sz)
    {
        sz = _sz;
        fe.resize(sz + 1, 0);
    }

    void add(int id, int val)
    {
        for (; id <= sz; id += id & -id)
        {
            fe[id] += val;
            fe[id] %= MOD;
        }
    }

    int get(int l)
    {
        int res = 0;
        for (; l; l -= l & -l)
        {
            res += fe[l];
            res %= MOD;
        }
        return res;
    }
};

void Solve()
{
    NenSo();
    BIT bit;
    bit.Init(num.size());
    for (int i = 1; i <= n; i++)
    {
        for (int j = b[i]; j >= a[i]; j--)
        {
            bit.add(nen(j), (bit.get(nen(j) - 1) + 1) % MOD);
        }
    }
    cout << bit.get(num.size());
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(task".INP","r"))
    {
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    Input();
    Solve();
}

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42