답안 #206145

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
206145	2020-03-02T12:19:01 Z	arnold518	Sparklers (JOI17_sparklers)	C++14	50 / 100	100 ms	8568 KB

sparklers

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1000;

int N, K;
ll T, A[MAXN+10], B[MAXN+10];

int dp[MAXN+10][MAXN+10];

int f(int l, int r)
{
	if(l==1 && r==N-1) return 1;
	int &ret=dp[l][r];
	if(ret!=-1) return ret;

	ret=0;
	if(l!=1 && B[r]-B[l-2]>=0 && f(l-1, r)==1) ret=1;
	if(r!=N-1 && B[r+1]-B[l-1]>=0 && f(l, r+1)==1) ret=1;
	return ret;
}

bool solve(ll v)
{
	int i, j;

	for(i=1; i<N; i++) B[i]=v*T-(A[i+1]-A[i])/2;
	memset(dp, -1, sizeof(dp));

	for(i=1; i<N; i++) B[i]+=B[i-1];
	return f(K, K-1);
}

int main()
{
	int i, j;

	scanf("%d%d%lld", &N, &K, &T), T*=2;
	for(i=1; i<=N; i++) scanf("%lld", &A[i]), A[i]*=2;

	ll lo=-1, hi=1e10;
	while(lo+1<hi)
	{
		ll mid=lo+hi>>1;
		if(solve(mid)) hi=mid;
		else lo=mid;
	}
	printf("%lld\n", hi);
}

Compilation message

sparklers.cpp: In function 'bool solve(ll)':
sparklers.cpp:29:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
sparklers.cpp: In function 'int main()':
sparklers.cpp:48:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=lo+hi>>1;
          ~~^~~
sparklers.cpp:40:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
sparklers.cpp:42:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%lld", &N, &K, &T), T*=2;
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
sparklers.cpp:43:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(i=1; i<=N; i++) scanf("%lld", &A[i]), A[i]*=2;
                      ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~

Subtask #1
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	4348 KB	Output is correct
2	Correct	11 ms	4344 KB	Output is correct
3	Correct	11 ms	4344 KB	Output is correct
4	Correct	11 ms	4344 KB	Output is correct
5	Correct	11 ms	4344 KB	Output is correct
6	Correct	11 ms	4344 KB	Output is correct
7	Correct	11 ms	4344 KB	Output is correct
8	Correct	11 ms	4344 KB	Output is correct
9	Correct	11 ms	4344 KB	Output is correct
10	Correct	11 ms	4344 KB	Output is correct
11	Correct	11 ms	4344 KB	Output is correct
12	Correct	12 ms	4344 KB	Output is correct
13	Correct	12 ms	4344 KB	Output is correct
14	Correct	12 ms	4344 KB	Output is correct
15	Correct	12 ms	4344 KB	Output is correct
16	Correct	12 ms	4344 KB	Output is correct
17	Correct	12 ms	4348 KB	Output is correct
18	Correct	11 ms	4344 KB	Output is correct
19	Correct	11 ms	4340 KB	Output is correct
20	Correct	11 ms	4344 KB	Output is correct
21	Correct	12 ms	4344 KB	Output is correct

Subtask #2
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	4348 KB	Output is correct
2	Correct	11 ms	4344 KB	Output is correct
3	Correct	11 ms	4344 KB	Output is correct
4	Correct	11 ms	4344 KB	Output is correct
5	Correct	11 ms	4344 KB	Output is correct
6	Correct	11 ms	4344 KB	Output is correct
7	Correct	11 ms	4344 KB	Output is correct
8	Correct	11 ms	4344 KB	Output is correct
9	Correct	11 ms	4344 KB	Output is correct
10	Correct	11 ms	4344 KB	Output is correct
11	Correct	11 ms	4344 KB	Output is correct
12	Correct	12 ms	4344 KB	Output is correct
13	Correct	12 ms	4344 KB	Output is correct
14	Correct	12 ms	4344 KB	Output is correct
15	Correct	12 ms	4344 KB	Output is correct
16	Correct	12 ms	4344 KB	Output is correct
17	Correct	12 ms	4348 KB	Output is correct
18	Correct	11 ms	4344 KB	Output is correct
19	Correct	11 ms	4340 KB	Output is correct
20	Correct	11 ms	4344 KB	Output is correct
21	Correct	12 ms	4344 KB	Output is correct
22	Correct	45 ms	4344 KB	Output is correct
23	Correct	33 ms	4344 KB	Output is correct
24	Correct	23 ms	4344 KB	Output is correct
25	Correct	15 ms	4344 KB	Output is correct
26	Correct	43 ms	4344 KB	Output is correct
27	Correct	50 ms	4344 KB	Output is correct
28	Correct	72 ms	4424 KB	Output is correct
29	Correct	75 ms	4344 KB	Output is correct
30	Correct	56 ms	4344 KB	Output is correct
31	Correct	62 ms	4344 KB	Output is correct
32	Correct	82 ms	4344 KB	Output is correct
33	Correct	77 ms	4344 KB	Output is correct
34	Correct	45 ms	4396 KB	Output is correct
35	Correct	76 ms	4472 KB	Output is correct
36	Correct	34 ms	4344 KB	Output is correct
37	Correct	32 ms	4344 KB	Output is correct
38	Correct	64 ms	4344 KB	Output is correct
39	Correct	27 ms	4344 KB	Output is correct
40	Correct	100 ms	4344 KB	Output is correct

Subtask #3
0 / 50.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	4348 KB	Output is correct
2	Correct	11 ms	4344 KB	Output is correct
3	Correct	11 ms	4344 KB	Output is correct
4	Correct	11 ms	4344 KB	Output is correct
5	Correct	11 ms	4344 KB	Output is correct
6	Correct	11 ms	4344 KB	Output is correct
7	Correct	11 ms	4344 KB	Output is correct
8	Correct	11 ms	4344 KB	Output is correct
9	Correct	11 ms	4344 KB	Output is correct
10	Correct	11 ms	4344 KB	Output is correct
11	Correct	11 ms	4344 KB	Output is correct
12	Correct	12 ms	4344 KB	Output is correct
13	Correct	12 ms	4344 KB	Output is correct
14	Correct	12 ms	4344 KB	Output is correct
15	Correct	12 ms	4344 KB	Output is correct
16	Correct	12 ms	4344 KB	Output is correct
17	Correct	12 ms	4348 KB	Output is correct
18	Correct	11 ms	4344 KB	Output is correct
19	Correct	11 ms	4340 KB	Output is correct
20	Correct	11 ms	4344 KB	Output is correct
21	Correct	12 ms	4344 KB	Output is correct
22	Correct	45 ms	4344 KB	Output is correct
23	Correct	33 ms	4344 KB	Output is correct
24	Correct	23 ms	4344 KB	Output is correct
25	Correct	15 ms	4344 KB	Output is correct
26	Correct	43 ms	4344 KB	Output is correct
27	Correct	50 ms	4344 KB	Output is correct
28	Correct	72 ms	4424 KB	Output is correct
29	Correct	75 ms	4344 KB	Output is correct
30	Correct	56 ms	4344 KB	Output is correct
31	Correct	62 ms	4344 KB	Output is correct
32	Correct	82 ms	4344 KB	Output is correct
33	Correct	77 ms	4344 KB	Output is correct
34	Correct	45 ms	4396 KB	Output is correct
35	Correct	76 ms	4472 KB	Output is correct
36	Correct	34 ms	4344 KB	Output is correct
37	Correct	32 ms	4344 KB	Output is correct
38	Correct	64 ms	4344 KB	Output is correct
39	Correct	27 ms	4344 KB	Output is correct
40	Correct	100 ms	4344 KB	Output is correct
41	Runtime error	13 ms	8568 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
42	Halted	0 ms	0 KB	-

답안 #206145

Compilation message

Subtask #1 30.0 / 30.0

Subtask #2 20.0 / 20.0

Subtask #3 0 / 50.0

Subtask #1
30.0 / 30.0

Subtask #2
20.0 / 20.0

Subtask #3
0 / 50.0