oj.uz

답안 #43720

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
43720 2018-03-21T11:08:26 Z RezwanArefin01 Skyscraper (JOI16_skyscraper) C++14
100 / 100
 297 ms 240776 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii; 

const int mod = 1e9 + 7;
int a[101], n, L;
ll dp[101][101][3][1001]; 

ll f(int i, int g, int end, int sum) {
	sum += (a[i] - a[i - 1]) * (2 * g + end); 
	if(g < 0 || end > 2 || sum > L) return 0; 
	if(i == n) return g == 0 && end;
	ll &ret = dp[i][g][end][sum];
	if(~ret) return ret; 

	ret = (g + 1) * f(i + 1, g + 1, end, sum);
	ret += (2 * g + end) * f(i + 1, g, end, sum); 
	ret += (g + end - 1) * f(i + 1, g - 1, end, sum); 
	ret += (2 - end) * f(i + 1, g, end + 1, sum);
	ret += (2 - end) * f(i + 1, g - 1, end + 1, sum); 
	ret %= mod;
	return ret;
}
int main(int argc, char const *argv[]) {
#ifdef LOCAL_TESTING
	freopen("in", "r", stdin);
#endif
	scanf("%d %d", &n, &L); 
	for(int i = 1; i <= n; i++) {
		scanf("%d", &a[i]); 
	} sort(a + 1, a + n + 1); 
	memset(dp, -1, sizeof dp);
	printf("%lld\n", n == 1 ? 1 : f(1, 0, 0, 0));
}

Compilation message

skyscraper.cpp: In function 'int main(int, const char**)':
skyscraper.cpp:30:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &L); 
                        ^
skyscraper.cpp:32:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]); 
                     ^

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 179 ms 240080 KB Output is correct
2 Correct 175 ms 240152 KB Output is correct
3 Correct 177 ms 240252 KB Output is correct
4 Correct 175 ms 240468 KB Output is correct
5 Correct 176 ms 240468 KB Output is correct
6 Correct 176 ms 240468 KB Output is correct
7 Correct 175 ms 240468 KB Output is correct
8 Correct 174 ms 240468 KB Output is correct
9 Correct 175 ms 240496 KB Output is correct
10 Correct 177 ms 240496 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 177 ms 240524 KB Output is correct
2 Correct 176 ms 240524 KB Output is correct
3 Correct 185 ms 240524 KB Output is correct
4 Correct 178 ms 240524 KB Output is correct
5 Correct 189 ms 240604 KB Output is correct
6 Correct 177 ms 240624 KB Output is correct
7 Correct 181 ms 240624 KB Output is correct
8 Correct 194 ms 240624 KB Output is correct
9 Correct 179 ms 240624 KB Output is correct
10 Correct 186 ms 240624 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 179 ms 240080 KB Output is correct
2 Correct 175 ms 240152 KB Output is correct
3 Correct 177 ms 240252 KB Output is correct
4 Correct 175 ms 240468 KB Output is correct
5 Correct 176 ms 240468 KB Output is correct
6 Correct 176 ms 240468 KB Output is correct
7 Correct 175 ms 240468 KB Output is correct
8 Correct 174 ms 240468 KB Output is correct
9 Correct 175 ms 240496 KB Output is correct
10 Correct 177 ms 240496 KB Output is correct
11 Correct 177 ms 240524 KB Output is correct
12 Correct 176 ms 240524 KB Output is correct
13 Correct 185 ms 240524 KB Output is correct
14 Correct 178 ms 240524 KB Output is correct
15 Correct 189 ms 240604 KB Output is correct
16 Correct 177 ms 240624 KB Output is correct
17 Correct 181 ms 240624 KB Output is correct
18 Correct 194 ms 240624 KB Output is correct
19 Correct 179 ms 240624 KB Output is correct
20 Correct 186 ms 240624 KB Output is correct
21 Correct 193 ms 240624 KB Output is correct
22 Correct 296 ms 240624 KB Output is correct
23 Correct 287 ms 240624 KB Output is correct
24 Correct 261 ms 240624 KB Output is correct
25 Correct 297 ms 240624 KB Output is correct
26 Correct 258 ms 240624 KB Output is correct
27 Correct 206 ms 240624 KB Output is correct
28 Correct 216 ms 240624 KB Output is correct
29 Correct 267 ms 240776 KB Output is correct
30 Correct 294 ms 240776 KB Output is correct