oj.uz

Submission #428447

# Submission time Handle Problem Language Result Execution time Memory
428447 2021-06-15T11:54:07 Z errorgorn Sparklers (JOI17_sparklers) C++17
50 / 100
 236 ms 34132 KB 
#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];

ii memo[1005][1005];

bool can(ll i){
	rep(x,0,1005) rep(y,0,1005) memo[x][y]=ii(1e10,-1e10);
	
	memo[k][k]=ii(arr[k]-i,arr[k]+i);
	
	rep(x,0,n-1){
		rep(y,1,n-x+1){
			int l=y,r=y+x;
			
			ii temp=memo[l][r];
			temp.fi=max(temp.fi,arr[l-1]-(x+1)*i);
			temp.se=min(temp.se,arr[l-1]+(x+1)*i);
			if (temp.fi<=temp.se){
				memo[l-1][r].fi=min(memo[l-1][r].fi,temp.fi-i);
				memo[l-1][r].se=max(memo[l-1][r].se,temp.se+i);
			}
			
			temp=memo[l][r];
			temp.fi=max(temp.fi,arr[r+1]-(x+1)*i);
			temp.se=min(temp.se,arr[r+1]+(x+1)*i);
			if (temp.fi<=temp.se){
				memo[l][r+1].fi=min(memo[l][r+1].fi,temp.fi-i);
				memo[l][r+1].se=max(memo[l][r+1].se,temp.se+i);
			}
		}
	}
	
	return memo[1][n].fi<=memo[1][n].se;
}

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:69:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |   mi=hi+lo>>1;
      |      ~~^~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 16076 KB Output is correct
2 Correct 63 ms 16196 KB Output is correct
3 Correct 64 ms 16076 KB Output is correct
4 Correct 64 ms 16076 KB Output is correct
5 Correct 67 ms 16120 KB Output is correct
6 Correct 67 ms 16116 KB Output is correct
7 Correct 67 ms 16076 KB Output is correct
8 Correct 69 ms 16112 KB Output is correct
9 Correct 67 ms 16076 KB Output is correct
10 Correct 67 ms 16196 KB Output is correct
11 Correct 68 ms 16076 KB Output is correct
12 Correct 64 ms 16120 KB Output is correct
13 Correct 64 ms 16108 KB Output is correct
14 Correct 68 ms 16032 KB Output is correct
15 Correct 66 ms 16044 KB Output is correct
16 Correct 67 ms 16196 KB Output is correct
17 Correct 65 ms 16116 KB Output is correct
18 Correct 64 ms 16076 KB Output is correct
19 Correct 62 ms 16076 KB Output is correct
20 Correct 63 ms 16084 KB Output is correct
21 Correct 61 ms 16076 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 16076 KB Output is correct
2 Correct 63 ms 16196 KB Output is correct
3 Correct 64 ms 16076 KB Output is correct
4 Correct 64 ms 16076 KB Output is correct
5 Correct 67 ms 16120 KB Output is correct
6 Correct 67 ms 16116 KB Output is correct
7 Correct 67 ms 16076 KB Output is correct
8 Correct 69 ms 16112 KB Output is correct
9 Correct 67 ms 16076 KB Output is correct
10 Correct 67 ms 16196 KB Output is correct
11 Correct 68 ms 16076 KB Output is correct
12 Correct 64 ms 16120 KB Output is correct
13 Correct 64 ms 16108 KB Output is correct
14 Correct 68 ms 16032 KB Output is correct
15 Correct 66 ms 16044 KB Output is correct
16 Correct 67 ms 16196 KB Output is correct
17 Correct 65 ms 16116 KB Output is correct
18 Correct 64 ms 16076 KB Output is correct
19 Correct 62 ms 16076 KB Output is correct
20 Correct 63 ms 16084 KB Output is correct
21 Correct 61 ms 16076 KB Output is correct
22 Correct 152 ms 16128 KB Output is correct
23 Correct 114 ms 16132 KB Output is correct
24 Correct 133 ms 16132 KB Output is correct
25 Correct 199 ms 16132 KB Output is correct
26 Correct 219 ms 16084 KB Output is correct
27 Correct 220 ms 16132 KB Output is correct
28 Correct 222 ms 16152 KB Output is correct
29 Correct 227 ms 16132 KB Output is correct
30 Correct 227 ms 16136 KB Output is correct
31 Correct 222 ms 16132 KB Output is correct
32 Correct 221 ms 16196 KB Output is correct
33 Correct 221 ms 16152 KB Output is correct
34 Correct 223 ms 16136 KB Output is correct
35 Correct 222 ms 16196 KB Output is correct
36 Correct 204 ms 16136 KB Output is correct
37 Correct 212 ms 16076 KB Output is correct
38 Correct 220 ms 16136 KB Output is correct
39 Correct 206 ms 16148 KB Output is correct
40 Correct 236 ms 16124 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 16076 KB Output is correct
2 Correct 63 ms 16196 KB Output is correct
3 Correct 64 ms 16076 KB Output is correct
4 Correct 64 ms 16076 KB Output is correct
5 Correct 67 ms 16120 KB Output is correct
6 Correct 67 ms 16116 KB Output is correct
7 Correct 67 ms 16076 KB Output is correct
8 Correct 69 ms 16112 KB Output is correct
9 Correct 67 ms 16076 KB Output is correct
10 Correct 67 ms 16196 KB Output is correct
11 Correct 68 ms 16076 KB Output is correct
12 Correct 64 ms 16120 KB Output is correct
13 Correct 64 ms 16108 KB Output is correct
14 Correct 68 ms 16032 KB Output is correct
15 Correct 66 ms 16044 KB Output is correct
16 Correct 67 ms 16196 KB Output is correct
17 Correct 65 ms 16116 KB Output is correct
18 Correct 64 ms 16076 KB Output is correct
19 Correct 62 ms 16076 KB Output is correct
20 Correct 63 ms 16084 KB Output is correct
21 Correct 61 ms 16076 KB Output is correct
22 Correct 152 ms 16128 KB Output is correct
23 Correct 114 ms 16132 KB Output is correct
24 Correct 133 ms 16132 KB Output is correct
25 Correct 199 ms 16132 KB Output is correct
26 Correct 219 ms 16084 KB Output is correct
27 Correct 220 ms 16132 KB Output is correct
28 Correct 222 ms 16152 KB Output is correct
29 Correct 227 ms 16132 KB Output is correct
30 Correct 227 ms 16136 KB Output is correct
31 Correct 222 ms 16132 KB Output is correct
32 Correct 221 ms 16196 KB Output is correct
33 Correct 221 ms 16152 KB Output is correct
34 Correct 223 ms 16136 KB Output is correct
35 Correct 222 ms 16196 KB Output is correct
36 Correct 204 ms 16136 KB Output is correct
37 Correct 212 ms 16076 KB Output is correct
38 Correct 220 ms 16136 KB Output is correct
39 Correct 206 ms 16148 KB Output is correct
40 Correct 236 ms 16124 KB Output is correct
41 Runtime error 37 ms 34132 KB Execution killed with signal 11
42 Halted 0 ms 0 KB -