Submission #697949

#	Time	Username	Problem	Language	Result	Execution time	Memory
697949		rukashii	Boat (APIO16_boat)	C++17	9 / 100	1 ms	340 KiB

boat

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

#define int long long

const int maxn = 502, M_sub2 = 1e6 + 2, MOD = 1e9 + 7;

int n;
pair <int, int> a[maxn];
bool c1, c2, c3;
long long dp[maxn];

long long power(long long a, long long b) {
    long long res = 1;
    while (b > 0) {
        if (b & 1)
            res = res * a % MOD;
        a = a * a % MOD;
        b >>= 1;
    }
    return res;
}

int mul(int a, int b)
{
    return (a * b) % MOD;
}

void sub1()
{
    long long ans = 1;
    dp[1] = 1;
    for (int i = 2; i <= n; i++)
    {
        dp[i] = 1;
        for (int j = 1; j < i; j++)
        {
            if (a[i].first > a[j].first)
            {
                // if (i == 2)
                //     cout << j << ' ' << dp[j] << '\n';
                dp[i] += dp[j];
                dp[i] %= MOD;
            }
        }
        ans += dp[i];
        ans %= MOD;
    }
    
    cout << ans;
}

signed main()
{
    ios::sync_with_stdio(0); cin.tie(0);

    // freopen("input.txt", "r" , stdin);
    // freopen("output.txt", "w", stdout);

    int sum = 0, tmp = 1e9 + 7;
    cin >> n;

    for (int i = 1; i <= n; i++)
    {
        int x, y;
        cin >> x >> y;

        // if (x != y)
        //     c1 = 1;
        a[i] = {x, y};
    }

    // if (!c1)
    return sub1(), 0;
}

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:60:9: warning: unused variable 'sum' [-Wunused-variable]
   60 |     int sum = 0, tmp = 1e9 + 7;
      |         ^~~
boat.cpp:60:18: warning: unused variable 'tmp' [-Wunused-variable]
   60 |     int sum = 0, tmp = 1e9 + 7;
      |                  ^~~

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