Submission #428605

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
428605	2021-06-15T13:11:24 Z	errorgorn	Sparklers (JOI17_sparklers)	C++17	50 / 100	70 ms	4092 KB

sparklers

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

#define ll long long
#define ii pair<ll,ll>
#define fi first
#define se second
#define endl '\n'

#define puf push_front
#define pof pop_front
#define pub push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound

#define rep(x,s,e) for (auto x=s-(s>e);x!=e-(s>e);s<e?x++:x--)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int) (x).size()

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n,k,t;
ll arr[100005];

bool memo[1005][1005];

bool can(ll i){
	rep(x,0,1005) rep(y,0,1005) memo[x][y]=false;
	
	memo[k][k]=true;
	
	rep(x,0,n){
		rep(y,1,n-x+1){
			int l=y,r=y+x;
			
			if (arr[r]-arr[l]>2*i*x) memo[l][r]=false;
			if (memo[l][r]) memo[l-1][r]=memo[l][r+1]=true;
		}
	}
	
	return memo[1][n];
}

int main(){
	cin.tie(0);
	cout.tie(0);
	cin.sync_with_stdio(false);
	
	cin>>n>>k>>t;
	
	rep(x,1,n+1) cin>>arr[x];
	
	ll lo=-1,hi=1e9,mi;
	while (hi-lo>1){
		mi=hi+lo>>1;
		
		if (can(mi)) hi=mi;
		else lo=mi;
	}
	
	cout<<(hi+t-1)/t<<endl;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:56:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   56 |   mi=hi+lo>>1;
      |      ~~^~~

Subtask #1
30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	1220 KB	Output is correct
2	Correct	2 ms	1208 KB	Output is correct
3	Correct	3 ms	1220 KB	Output is correct
4	Correct	2 ms	1228 KB	Output is correct
5	Correct	2 ms	1228 KB	Output is correct
6	Correct	2 ms	1228 KB	Output is correct
7	Correct	2 ms	1228 KB	Output is correct
8	Correct	2 ms	1228 KB	Output is correct
9	Correct	2 ms	1228 KB	Output is correct
10	Correct	2 ms	1228 KB	Output is correct
11	Correct	2 ms	1216 KB	Output is correct
12	Correct	2 ms	1228 KB	Output is correct
13	Correct	2 ms	1216 KB	Output is correct
14	Correct	2 ms	1228 KB	Output is correct
15	Correct	3 ms	1228 KB	Output is correct
16	Correct	2 ms	1228 KB	Output is correct
17	Correct	3 ms	1228 KB	Output is correct
18	Correct	2 ms	1228 KB	Output is correct
19	Correct	3 ms	1228 KB	Output is correct
20	Correct	2 ms	1228 KB	Output is correct
21	Correct	2 ms	1228 KB	Output is correct

Subtask #2
20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	1220 KB	Output is correct
2	Correct	2 ms	1208 KB	Output is correct
3	Correct	3 ms	1220 KB	Output is correct
4	Correct	2 ms	1228 KB	Output is correct
5	Correct	2 ms	1228 KB	Output is correct
6	Correct	2 ms	1228 KB	Output is correct
7	Correct	2 ms	1228 KB	Output is correct
8	Correct	2 ms	1228 KB	Output is correct
9	Correct	2 ms	1228 KB	Output is correct
10	Correct	2 ms	1228 KB	Output is correct
11	Correct	2 ms	1216 KB	Output is correct
12	Correct	2 ms	1228 KB	Output is correct
13	Correct	2 ms	1216 KB	Output is correct
14	Correct	2 ms	1228 KB	Output is correct
15	Correct	3 ms	1228 KB	Output is correct
16	Correct	2 ms	1228 KB	Output is correct
17	Correct	3 ms	1228 KB	Output is correct
18	Correct	2 ms	1228 KB	Output is correct
19	Correct	3 ms	1228 KB	Output is correct
20	Correct	2 ms	1228 KB	Output is correct
21	Correct	2 ms	1228 KB	Output is correct
22	Correct	28 ms	1224 KB	Output is correct
23	Correct	16 ms	1228 KB	Output is correct
24	Correct	24 ms	1228 KB	Output is correct
25	Correct	48 ms	1228 KB	Output is correct
26	Correct	55 ms	1308 KB	Output is correct
27	Correct	49 ms	1228 KB	Output is correct
28	Correct	60 ms	1228 KB	Output is correct
29	Correct	56 ms	1228 KB	Output is correct
30	Correct	47 ms	1304 KB	Output is correct
31	Correct	45 ms	1228 KB	Output is correct
32	Correct	58 ms	1228 KB	Output is correct
33	Correct	47 ms	1228 KB	Output is correct
34	Correct	54 ms	1228 KB	Output is correct
35	Correct	48 ms	1228 KB	Output is correct
36	Correct	51 ms	1228 KB	Output is correct
37	Correct	40 ms	1224 KB	Output is correct
38	Correct	46 ms	1304 KB	Output is correct
39	Correct	70 ms	1324 KB	Output is correct
40	Correct	45 ms	1228 KB	Output is correct

Subtask #3
0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	1220 KB	Output is correct
2	Correct	2 ms	1208 KB	Output is correct
3	Correct	3 ms	1220 KB	Output is correct
4	Correct	2 ms	1228 KB	Output is correct
5	Correct	2 ms	1228 KB	Output is correct
6	Correct	2 ms	1228 KB	Output is correct
7	Correct	2 ms	1228 KB	Output is correct
8	Correct	2 ms	1228 KB	Output is correct
9	Correct	2 ms	1228 KB	Output is correct
10	Correct	2 ms	1228 KB	Output is correct
11	Correct	2 ms	1216 KB	Output is correct
12	Correct	2 ms	1228 KB	Output is correct
13	Correct	2 ms	1216 KB	Output is correct
14	Correct	2 ms	1228 KB	Output is correct
15	Correct	3 ms	1228 KB	Output is correct
16	Correct	2 ms	1228 KB	Output is correct
17	Correct	3 ms	1228 KB	Output is correct
18	Correct	2 ms	1228 KB	Output is correct
19	Correct	3 ms	1228 KB	Output is correct
20	Correct	2 ms	1228 KB	Output is correct
21	Correct	2 ms	1228 KB	Output is correct
22	Correct	28 ms	1224 KB	Output is correct
23	Correct	16 ms	1228 KB	Output is correct
24	Correct	24 ms	1228 KB	Output is correct
25	Correct	48 ms	1228 KB	Output is correct
26	Correct	55 ms	1308 KB	Output is correct
27	Correct	49 ms	1228 KB	Output is correct
28	Correct	60 ms	1228 KB	Output is correct
29	Correct	56 ms	1228 KB	Output is correct
30	Correct	47 ms	1304 KB	Output is correct
31	Correct	45 ms	1228 KB	Output is correct
32	Correct	58 ms	1228 KB	Output is correct
33	Correct	47 ms	1228 KB	Output is correct
34	Correct	54 ms	1228 KB	Output is correct
35	Correct	48 ms	1228 KB	Output is correct
36	Correct	51 ms	1228 KB	Output is correct
37	Correct	40 ms	1224 KB	Output is correct
38	Correct	46 ms	1304 KB	Output is correct
39	Correct	70 ms	1324 KB	Output is correct
40	Correct	45 ms	1228 KB	Output is correct
41	Runtime error	13 ms	4092 KB	Execution killed with signal 11
42	Halted	0 ms	0 KB	-

Submission #428605

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