oj.uz

Submission #112147

# Submission time Handle Problem Language Result Execution time Memory
112147 2019-05-17T15:42:06 Z dolphingarlic Watching (JOI13_watching) C++14
100 / 100
 174 ms 16256 KB 
#include<bits/stdc++.h>
 
using namespace std;
#define taskname "A"
#define pb	push_back
#define mp 	make_pair
#ifndef LOCAL
#define cerr if(0)cout
#endif
 
typedef long double ld;
typedef long long ll;
typedef pair<int,ll> ii;
const int maxn = 2005;
 
int n , q , p;
 
int a[maxn];
 
int dp[maxn][maxn];
 
bool chk(int w){
    dp[0][0] = 0;
    int ii = 1 , jj = 1;
    for(int i = 1 ; i <= n ; ++i){
        while(a[i] - a[ii] + 1 > w)++ii;
        while(a[i] - a[jj] + 1 > 2 * w)++jj;
//        cout << ii << " " << jj << " " << i << endl;
        for(int j = 0 ; j <= i && j <= p ; ++j){
            if(j == 0)dp[i][j] = dp[jj - 1][j] + 1;
            else dp[i][j] = min(dp[jj - 1][j] + 1 , dp[ii - 1][j - 1]),dp[i][j] = min(dp[i][j] , dp[i][j - 1]);
        }
    }
//    cout << w << " " << dp[n][min(p,n)] << endl;
    return dp[n][min(p,n)] <= q;
}
 
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n >> p >> q;
    int l = 1 , h = 1e9;
    for(int i = 1 ; i <= n ; ++i)cin >> a[i];
    sort(a + 1 , a + n + 1);
    fill_n(&dp[0][0],maxn*maxn,q + 1);
    while(l <= h){
        int mid = l + h >> 1;
        if(!chk(mid))l = mid + 1;
        else h = mid - 1;
//        return 0;
    }
    cout << l;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:52:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid = l + h >> 1;
                   ~~^~~
watching.cpp:43:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:44:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 16128 KB Output is correct
2 Correct 13 ms 16000 KB Output is correct
3 Correct 13 ms 16000 KB Output is correct
4 Correct 13 ms 16128 KB Output is correct
5 Correct 13 ms 16000 KB Output is correct
6 Correct 13 ms 16000 KB Output is correct
7 Correct 13 ms 16128 KB Output is correct
8 Correct 13 ms 16128 KB Output is correct
9 Correct 13 ms 16128 KB Output is correct
10 Correct 13 ms 16128 KB Output is correct
11 Correct 13 ms 16120 KB Output is correct
12 Correct 13 ms 16128 KB Output is correct
13 Correct 13 ms 16128 KB Output is correct
14 Correct 13 ms 16128 KB Output is correct
15 Correct 13 ms 16128 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 16000 KB Output is correct
2 Correct 13 ms 16040 KB Output is correct
3 Correct 162 ms 16120 KB Output is correct
4 Correct 170 ms 16128 KB Output is correct
5 Correct 27 ms 16128 KB Output is correct
6 Correct 169 ms 16136 KB Output is correct
7 Correct 16 ms 16128 KB Output is correct
8 Correct 36 ms 16128 KB Output is correct
9 Correct 114 ms 16256 KB Output is correct
10 Correct 174 ms 16128 KB Output is correct
11 Correct 29 ms 16176 KB Output is correct
12 Correct 134 ms 16220 KB Output is correct
13 Correct 16 ms 16128 KB Output is correct
14 Correct 17 ms 16128 KB Output is correct
15 Correct 16 ms 16128 KB Output is correct