oj.uz

Submission #232892

# Submission time Handle Problem Language Result Execution time Memory
232892 2020-05-18T15:26:57 Z thebes Sparklers (JOI17_sparklers) C++14
50 / 100
 304 ms 7544 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<double,double> pdd;
typedef vector<int> vi;
#define F first
#define S second
#define pb push_back

const int MN = 1005;
int N, K, T, i, j, lo, hi, mid, arr[MN];
double dp[MN][MN]; bitset<MN> vs[MN];

double solve(int l,int r){
    if(vs[l][r]) return dp[l][r];
    else if(l==r){
        if(l==K) return T;
        else return -1;
    }
    vs[l][r]=1;
    dp[l][r]=-1;
    if(solve(l,r-1)>=(arr[r]-arr[r-1])/(double)(2*mid))
        dp[l][r]=max(dp[l][r],solve(l,r-1)-(arr[r]-arr[r-1])/(double)(2*mid)+T);
    if(solve(l+1,r)>=(arr[l+1]-arr[l])/(double)(2*mid))
        dp[l][r]=max(dp[l][r],solve(l+1,r)-(arr[l+1]-arr[l])/(double)(2*mid)+T);
    return dp[l][r];
}

int main(){
    scanf("%d%d%d",&N,&K,&T);
    for(i=1;i<=N;i++)
        scanf("%d",&arr[i]);
    if(arr[N]==0){
        printf("0\n");
        return 0;
    }
    lo = 1, hi = 1e9;
    while(lo<hi){
        mid = (lo+hi)>>1;
        for(i=1;i<=N;i++)
            vs[i].reset();
        if(solve(1,N)>=0) hi=mid;
        else lo=mid+1;
    }
    printf("%d\n",lo);
    return 0;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&N,&K,&T);
     ~~~~~^~~~~~~~~~~~~~~~~~~
sparklers.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&arr[i]);
         ~~~~~^~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 168 ms 5368 KB Output is correct
23 Correct 93 ms 4088 KB Output is correct
24 Correct 126 ms 5248 KB Output is correct
25 Correct 224 ms 7544 KB Output is correct
26 Correct 263 ms 7424 KB Output is correct
27 Correct 285 ms 7424 KB Output is correct
28 Correct 293 ms 7500 KB Output is correct
29 Correct 272 ms 7424 KB Output is correct
30 Correct 266 ms 7496 KB Output is correct
31 Correct 283 ms 7544 KB Output is correct
32 Correct 278 ms 7424 KB Output is correct
33 Correct 304 ms 7544 KB Output is correct
34 Correct 284 ms 7544 KB Output is correct
35 Correct 285 ms 7544 KB Output is correct
36 Correct 254 ms 7544 KB Output is correct
37 Correct 242 ms 7544 KB Output is correct
38 Correct 280 ms 7424 KB Output is correct
39 Correct 230 ms 7544 KB Output is correct
40 Correct 5 ms 384 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 168 ms 5368 KB Output is correct
23 Correct 93 ms 4088 KB Output is correct
24 Correct 126 ms 5248 KB Output is correct
25 Correct 224 ms 7544 KB Output is correct
26 Correct 263 ms 7424 KB Output is correct
27 Correct 285 ms 7424 KB Output is correct
28 Correct 293 ms 7500 KB Output is correct
29 Correct 272 ms 7424 KB Output is correct
30 Correct 266 ms 7496 KB Output is correct
31 Correct 283 ms 7544 KB Output is correct
32 Correct 278 ms 7424 KB Output is correct
33 Correct 304 ms 7544 KB Output is correct
34 Correct 284 ms 7544 KB Output is correct
35 Correct 285 ms 7544 KB Output is correct
36 Correct 254 ms 7544 KB Output is correct
37 Correct 242 ms 7544 KB Output is correct
38 Correct 280 ms 7424 KB Output is correct
39 Correct 230 ms 7544 KB Output is correct
40 Correct 5 ms 384 KB Output is correct
41 Runtime error 5 ms 512 KB Execution killed with signal 11 (could be triggered by violating memory limits)
42 Halted 0 ms 0 KB -