oj.uz

Submission #111375

# Submission time Handle Problem Language Result Execution time Memory
111375 2019-05-15T04:05:02 Z diamond_duke Boat (APIO16_boat) C++11
27 / 100
 215 ms 632 KB 
#include <algorithm>
#include <cstring>
#include <cstdio>
using ll = long long;
constexpr int MOD = 1e9 + 7;
inline int quick_pow(int a, int n)
{
	int res = 1;
	while (n)
	{
		if (n & 1)
			res = (ll)res * a % MOD;
		a = (ll)a * a % MOD;
		n >>= 1;
	}
	return res;
}
int lp[105], rp[105], app[205], dp[2][205][105], inv[105];
int main()
{
	// freopen("uoj-204.in", "r", stdin);
	int n, cnt = 0;
	scanf("%d", &n);
	for (int i = 0; i < n; i++)
	{
		scanf("%d%d", lp + i, rp + i);
		app[cnt++] = lp[i];
		app[cnt++] = ++rp[i];
	}
	std::sort(app, app + cnt);
	cnt = std::unique(app, app + cnt) - app;
	for (int i = 0; i < n; i++)
	{
		lp[i] = std::lower_bound(app, app + cnt, lp[i]) - app;
		rp[i] = std::lower_bound(app, app + cnt, rp[i]) - app;
	}
	inv[0] = inv[1] = 1;
	for (int i = 2; i <= n; i++)
		inv[i] = (ll)(MOD - MOD / i) * inv[MOD % i] % MOD;
	dp[0][0][0] = 1;
	for (int i = 0; i < n; i++)
	{
		auto cur = dp[i & 1], nxt = dp[i & 1 ^ 1];
		memcpy(nxt, cur, sizeof(dp[i & 1]));
		for (int j = 0; j < cnt; j++)
		{
			for (int k = 0; k <= i; k++)
			{
				if (!cur[j][k])
					continue;
				for (int x = std::max(j, lp[i]); x < rp[i]; x++)
				{
					int t = (x == j) * k + 1, len = app[x + 1] - app[x];
					nxt[x][t] = (nxt[x][t] + (ll)cur[j][k] * (len - t + 1) % MOD * inv[t]) % MOD;
				}
			}
		}
	}
	int ans = 0;
	for (int i = 0; i < cnt; i++)
	{
		for (int j = 0; j <= n; j++)
			ans = (ans + dp[n & 1][i][j]) % MOD;
	}
	printf("%d\n", (ans + MOD - 1) % MOD);
	return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:43:36: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   auto cur = dp[i & 1], nxt = dp[i & 1 ^ 1];
                                  ~~^~~
boat.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
boat.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", lp + i, rp + i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 512 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 512 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 512 KB Output is correct
2 Correct 45 ms 504 KB Output is correct
3 Correct 57 ms 504 KB Output is correct
4 Correct 59 ms 504 KB Output is correct
5 Correct 66 ms 512 KB Output is correct
6 Correct 195 ms 512 KB Output is correct
7 Correct 202 ms 632 KB Output is correct
8 Correct 207 ms 504 KB Output is correct
9 Correct 177 ms 512 KB Output is correct
10 Correct 215 ms 512 KB Output is correct
11 Correct 87 ms 512 KB Output is correct
12 Correct 106 ms 504 KB Output is correct
13 Correct 81 ms 512 KB Output is correct
14 Correct 85 ms 632 KB Output is correct
15 Correct 80 ms 504 KB Output is correct
16 Correct 23 ms 504 KB Output is correct
17 Correct 17 ms 512 KB Output is correct
18 Correct 18 ms 512 KB Output is correct
19 Correct 15 ms 512 KB Output is correct
20 Correct 23 ms 512 KB Output is correct

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 512 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -