Submission #1131266


Source Code Expand

#include <bits/stdc++.h>
 
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define li long long
#define itn int
 
using namespace std;
 
inline int nxt(){
	int n;
	scanf("%d", &n);
	return n;
}

ostream& operator <<(ostream& ostr, const vector<int>& a) {
	ostr << "(";
	for (size_t i = 0; i < a.size(); ++i) {
		if (i) {
			ostr << ", ";
		}
		ostr << a[i];
	}
	ostr << ")";
	return ostr;
}

int main(){

	int n = nxt();
	vector<int> a(n);
	for (int i = 0; i < n; ++i) {
		a[i] = nxt();
	}

	vector<int> dp(n);
	dp[0] = a[0];
	for (int i = 1; i < n; ++i) {
		if (a[i] == a[i - 1] + 1) {
			if (dp[i - 1] == a[i - 1] - 2 * (i - 1)) {
				dp[i] = dp[i - 1] - 1;
			} else {
				dp[i] = dp[i - 1];
			}
		} else {
			dp[i] = dp[i - 1];
		}
	}

	vector<int> place(n);
	for (int i = 1; i < n; ++i) {
		if (dp[i - 1] > 0) {
			place[i] = 0;
		} else {
			place[i] = 1 + (-dp[i - 1]) / 2;
		}
	}

	// cerr << dp << "\n";

	const int mod = 1000000007;
	long long ans = 1;
	vector<int> cnt(1, 0);
	for (int i = 0; i < n; ++i) {
		while (place[i] >= cnt.size()) {
			cnt.push_back(cnt.back());
		}
		cnt.back() += 1;
	}
	while (cnt.size() < n) {
		cnt.push_back(cnt.back());
	}
	for (int i = 0; i < n; ++i) {
		ans = ans * (cnt[i] - i) % mod;
	}

	cout << ans << "\n";

	return 0;
}

Submission Info

Submission Time
Task A - Robot Racing
User Golovanov399
Language C++14 (GCC 5.4.1)
Score 900
Code Size 1382 Byte
Status AC
Exec Time 15 ms
Memory 2044 KB

Compile Error

./Main.cpp: In function ‘int nxt()’:
./Main.cpp:12:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^

Judge Result

Set Name Sample Subtask All
Score / Max Score 0 / 0 500 / 500 400 / 400
Status
AC × 4
AC × 14
AC × 28
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt
Subtask 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 2_00.txt, 2_01.txt, 2_02.txt, 2_03.txt, 2_04.txt, 2_05.txt, 2_06.txt, 2_07.txt, 2_08.txt, 2_09.txt, 2_10.txt, 2_11.txt, 2_12.txt
Case Name Status Exec Time Memory
0_00.txt AC 1 ms 256 KB
0_01.txt AC 1 ms 256 KB
0_02.txt AC 1 ms 256 KB
0_03.txt AC 1 ms 256 KB
1_00.txt AC 1 ms 256 KB
1_01.txt AC 1 ms 256 KB
1_02.txt AC 1 ms 256 KB
1_03.txt AC 1 ms 256 KB
1_04.txt AC 1 ms 256 KB
1_05.txt AC 1 ms 256 KB
1_06.txt AC 1 ms 256 KB
1_07.txt AC 1 ms 256 KB
1_08.txt AC 1 ms 256 KB
1_09.txt AC 1 ms 256 KB
1_10.txt AC 1 ms 256 KB
2_00.txt AC 13 ms 2044 KB
2_01.txt AC 13 ms 2044 KB
2_02.txt AC 15 ms 2044 KB
2_03.txt AC 13 ms 2044 KB
2_04.txt AC 13 ms 2044 KB
2_05.txt AC 13 ms 2044 KB
2_06.txt AC 13 ms 2044 KB
2_07.txt AC 13 ms 2044 KB
2_08.txt AC 13 ms 2044 KB
2_09.txt AC 13 ms 2044 KB
2_10.txt AC 13 ms 2044 KB
2_11.txt AC 14 ms 2044 KB
2_12.txt AC 14 ms 2044 KB