oj.uz

답안 #340160

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
340160 2020-12-27T05:37:10 Z blue Boat (APIO16_boat) C++11
9 / 100
 5 ms 364 KB 
#include <iostream>
#include <algorithm>
using namespace std;

/*
dp[i][j] = number of valid configurations for schools 1..i but such that i has range a[j] to b[i]

Let us malong longain a long range partitioned by polong longs P[i]
Each section of the range looks like:
A[p] to A[q]-1;
A[p] to B[q]
B[p]+1 to A[q]-1;
B[p]+1 to B[q]
*/

long long mod = 1e9 + 7;

long long a[501], b[501];

long long pos(long long i) //upper acceptable limit of range
{
    if(i > 0) return a[i] - 1;
    else return b[-i];
}

int main()
{
    long long N;
    cin >> N;
    for(long long i = 1; i <= N; i++) cin >> a[i] >> b[i];

    long long I[2*N];
    for(long long i = 0; i < N; i++)
    {
        I[i] = i+1;
        I[i+N] = -i-1;
    }

    sort(I, I+2*N, [] (long long x, long long y)
    {
        return pos(x) < pos(y);
    });

    long long dp[2*N]; //number of streams in between I[i-1] and I[i].
    for(long long i = 0; i < 2*N; i++) dp[i] = 0;

    long long temp = 0;
    long long temp2;
    for(long long i = 1; i <= N; i++)
    {
        // cout << "i = " << i << '\n';
        temp = 0;
        for(long long j = 0; j < 2*N; j++)
        {
            if(pos(I[j]) <= pos(i)) temp = (temp + dp[j]) % mod;
            else if(pos(I[j]) <= pos(-i))
            {
                temp2 = temp;
                temp = (temp + dp[j]) % mod;
                if(j > 0) dp[j] = (dp[j] + (pos(I[j]) - pos(I[j-1])) * (temp2 + 1)) % mod;
            }
        }
        // for(long long j = 0; j < 2*N; j++)
        // {
        //     cout << j << ' ' << I[j] << ' ' << pos(I[j]) << ' ' << dp[j] << '\n';
        // }
        // cout << "_________________________\n";
    }
    long long res = 0;
    for(long long j = 0; j < 2*N; j++) res = (res + dp[j]) % mod;

    cout << res << '\n';
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 364 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Correct 3 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 3 ms 364 KB Output is correct
8 Correct 3 ms 364 KB Output is correct
9 Correct 3 ms 364 KB Output is correct
10 Correct 3 ms 364 KB Output is correct
11 Correct 3 ms 364 KB Output is correct
12 Correct 3 ms 364 KB Output is correct
13 Correct 3 ms 364 KB Output is correct
14 Correct 3 ms 364 KB Output is correct
15 Correct 3 ms 364 KB Output is correct
16 Correct 3 ms 364 KB Output is correct
17 Correct 3 ms 364 KB Output is correct
18 Correct 5 ms 364 KB Output is correct
19 Correct 3 ms 364 KB Output is correct
20 Correct 3 ms 364 KB Output is correct

Subtask #2
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 364 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Correct 3 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 3 ms 364 KB Output is correct
8 Correct 3 ms 364 KB Output is correct
9 Correct 3 ms 364 KB Output is correct
10 Correct 3 ms 364 KB Output is correct
11 Correct 3 ms 364 KB Output is correct
12 Correct 3 ms 364 KB Output is correct
13 Correct 3 ms 364 KB Output is correct
14 Correct 3 ms 364 KB Output is correct
15 Correct 3 ms 364 KB Output is correct
16 Correct 3 ms 364 KB Output is correct
17 Correct 3 ms 364 KB Output is correct
18 Correct 5 ms 364 KB Output is correct
19 Correct 3 ms 364 KB Output is correct
20 Correct 3 ms 364 KB Output is correct
21 Incorrect 5 ms 364 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 364 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Correct 3 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 3 ms 364 KB Output is correct
8 Correct 3 ms 364 KB Output is correct
9 Correct 3 ms 364 KB Output is correct
10 Correct 3 ms 364 KB Output is correct
11 Correct 3 ms 364 KB Output is correct
12 Correct 3 ms 364 KB Output is correct
13 Correct 3 ms 364 KB Output is correct
14 Correct 3 ms 364 KB Output is correct
15 Correct 3 ms 364 KB Output is correct
16 Correct 3 ms 364 KB Output is correct
17 Correct 3 ms 364 KB Output is correct
18 Correct 5 ms 364 KB Output is correct
19 Correct 3 ms 364 KB Output is correct
20 Correct 3 ms 364 KB Output is correct
21 Incorrect 5 ms 364 KB Output isn't correct
22 Halted 0 ms 0 KB -