oj.uz

Submission #206143

# Submission time Handle Problem Language Result Execution time Memory
206143 2020-03-02T12:15:54 Z arnold518 Sparklers (JOI17_sparklers) C++14
0 / 100
 42 ms 4600 KB 
#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=0, 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
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 4344 KB Output is correct
2 Correct 11 ms 4344 KB Output is correct
3 Correct 14 ms 4344 KB Output is correct
4 Correct 13 ms 4344 KB Output is correct
5 Correct 16 ms 4344 KB Output is correct
6 Correct 12 ms 4344 KB Output is correct
7 Correct 11 ms 4344 KB Output is correct
8 Correct 20 ms 4344 KB Output is correct
9 Correct 12 ms 4340 KB Output is correct
10 Correct 13 ms 4344 KB Output is correct
11 Correct 35 ms 4344 KB Output is correct
12 Correct 42 ms 4344 KB Output is correct
13 Correct 11 ms 4344 KB Output is correct
14 Correct 11 ms 4344 KB Output is correct
15 Correct 15 ms 4344 KB Output is correct
16 Correct 28 ms 4344 KB Output is correct
17 Correct 17 ms 4344 KB Output is correct
18 Correct 28 ms 4600 KB Output is correct
19 Incorrect 15 ms 4344 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 4344 KB Output is correct
2 Correct 11 ms 4344 KB Output is correct
3 Correct 14 ms 4344 KB Output is correct
4 Correct 13 ms 4344 KB Output is correct
5 Correct 16 ms 4344 KB Output is correct
6 Correct 12 ms 4344 KB Output is correct
7 Correct 11 ms 4344 KB Output is correct
8 Correct 20 ms 4344 KB Output is correct
9 Correct 12 ms 4340 KB Output is correct
10 Correct 13 ms 4344 KB Output is correct
11 Correct 35 ms 4344 KB Output is correct
12 Correct 42 ms 4344 KB Output is correct
13 Correct 11 ms 4344 KB Output is correct
14 Correct 11 ms 4344 KB Output is correct
15 Correct 15 ms 4344 KB Output is correct
16 Correct 28 ms 4344 KB Output is correct
17 Correct 17 ms 4344 KB Output is correct
18 Correct 28 ms 4600 KB Output is correct
19 Incorrect 15 ms 4344 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 4344 KB Output is correct
2 Correct 11 ms 4344 KB Output is correct
3 Correct 14 ms 4344 KB Output is correct
4 Correct 13 ms 4344 KB Output is correct
5 Correct 16 ms 4344 KB Output is correct
6 Correct 12 ms 4344 KB Output is correct
7 Correct 11 ms 4344 KB Output is correct
8 Correct 20 ms 4344 KB Output is correct
9 Correct 12 ms 4340 KB Output is correct
10 Correct 13 ms 4344 KB Output is correct
11 Correct 35 ms 4344 KB Output is correct
12 Correct 42 ms 4344 KB Output is correct
13 Correct 11 ms 4344 KB Output is correct
14 Correct 11 ms 4344 KB Output is correct
15 Correct 15 ms 4344 KB Output is correct
16 Correct 28 ms 4344 KB Output is correct
17 Correct 17 ms 4344 KB Output is correct
18 Correct 28 ms 4600 KB Output is correct
19 Incorrect 15 ms 4344 KB Output isn't correct
20 Halted 0 ms 0 KB -