oj.uz

답안 #832852

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
832852 2023-08-21T15:58:21 Z caganyanmaz Boat (APIO16_boat) C++17
27 / 100
 1355 ms 8512 KB 
#include <bits/stdc++.h>
#define pb push_back
using namespace std;


//#define DEBUGGING
#ifdef DEBUGGING
#include "../debug.h"
#else
#define debug(x...) void(42)
#endif

constexpr static int MXN = 600;
constexpr static int MXR = 1100;
int n;
vector<int> a, b;
vector<int> ranges;
int dp[MXR][MXN]; // Schools passed, last range, count in  last range
int old_dp[MXR][MXN];
int sums[MXN][MXN]; // last range
constexpr static int MOD = 1e9 + 7;

static inline int add(int a, int b) { return (a+b) % MOD; }
static inline int mul(int64_t a, int64_t b) { return (a*b) % MOD; }

int pow(int a, int b)
{
	int res = 1;
	while (b)
	{
		if (b&1)
		{
			res = mul(a, res);
			b--;
		}
		else
		{
			a = mul(a, a);
			b >>= 1;
		}
	}
	return res;
}

int _div(int a, int b) { return mul(a, pow(b, MOD-2)); }
int C[MXR][MXN];
int p[MXN];

int main()
{
	cin >> n;
	p[0] = 1;
	for (int i = 1; i < n; i++)
		p[i] = mul(i, p[i-1]);
	a.resize(n, 0), b.resize(n, 0);
	debug("A");
	for (int i = 0; i < n; i++)
	{
		cin >> a[i] >> b[i];
		b[i]++;
	}
	debug("b");
	vector<int> c;
 	for (int i = 0; i < n; i++)
		c.pb(a[i]);
	for (int i = 0; i < n; i++)
		c.pb(b[i]);
	debug("A");
	sort(c.begin(), c.end());
	auto last = unique(c.begin(), c.end());
	c.erase(last, c.end());
	int rn = c.size();
	for (int i = 0; i < c.size()-1; i++)
		ranges.pb(c[i+1] - c[i]);
	debug("B");
	for (int i = 0; i < rn; i++)
	{
		int pf = 1;
		for (int j = 0; j <= n; j++)
		{
			C[i][j] = pf;
			pf = mul(pf, ranges[i]-j);
			pf = _div(pf, j+1);
			if (ranges[i] < j)
				C[i][j] = 0;
			debug(i, j, C[i][j]);
		}
	}
	debug("D");
	debug(a, b);
	for (int& i : a)
		i = lower_bound(c.begin(), c.end(), i) - c.begin();
	for (int& i : b)
		i = lower_bound(c.begin(), c.end(), i) - c.begin();
	debug(a, b);
	for (int j = 0; j < rn; j++)
		old_dp[j][0] = 1;
	for (int i = 1; i <= n; i++) // Current node
	{
		for (int j = 0; j < rn; j++) // Current range
		{
			dp[j][0] = 1;
			for (int k = 1; k <= n; k++) // Current count 
			{
				dp[j][k] = 0;
				if (a[i-1] <= j && b[i-1] > j)
				{
					if (j > 0 && k == 1)
						dp[j][k] = add(dp[j][k], sums[i-1][j-1]); // Starting with it
					dp[j][k] = add(dp[j][k], old_dp[j][k-1]); // Including it		
					debug(i, j, k);
				}
				dp[j][k] = add(dp[j][k], old_dp[j][k]); // Not including it
				debug(i, j, k, dp[j][k]);
			}
		}
		for (int j = 0; j < rn; j++)
		{
			if (j > 0)
				sums[i][j] = add(sums[i][j], sums[i][j-1]);
			debug(sums[i][j]);
			for (int k = 1; k <= n; k++)
			{
				sums[i][j] = add(sums[i][j], mul(dp[j][k], C[j][k]));
			}
			debug(i, j, sums[i][j]);
		}
		for (int j = 0; j < rn; j++)
			for (int k = 1; k <= n; k++)
				old_dp[j][k] = dp[j][k];
	}
	int res = 0;
	for (int i = 0; i < rn; i++)
	{
		for (int j = 1; j <= n; j++)
		{
			debug(i, j, old_dp[i][j]);
			res = add(res, mul(old_dp[i][j], C[i][j]));
		}
	
	}
	cout << res << "\n";
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |  for (int i = 0; i < c.size()-1; i++)
      |                  ~~^~~~~~~~~~~~

Subtask #1
0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1355 ms 8512 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1355 ms 8512 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 1928 KB Output is correct
2 Correct 15 ms 1876 KB Output is correct
3 Correct 16 ms 1876 KB Output is correct
4 Correct 15 ms 1956 KB Output is correct
5 Correct 15 ms 1876 KB Output is correct
6 Correct 19 ms 1932 KB Output is correct
7 Correct 16 ms 1852 KB Output is correct
8 Correct 16 ms 1876 KB Output is correct
9 Correct 16 ms 1972 KB Output is correct
10 Correct 15 ms 1876 KB Output is correct
11 Correct 17 ms 1968 KB Output is correct
12 Correct 15 ms 1880 KB Output is correct
13 Correct 15 ms 1876 KB Output is correct
14 Correct 15 ms 1968 KB Output is correct
15 Correct 15 ms 1956 KB Output is correct
16 Correct 9 ms 1308 KB Output is correct
17 Correct 9 ms 1236 KB Output is correct
18 Correct 9 ms 1364 KB Output is correct
19 Correct 9 ms 1304 KB Output is correct
20 Correct 9 ms 1236 KB Output is correct

Subtask #4
0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1355 ms 8512 KB Output isn't correct
2 Halted 0 ms 0 KB -