oj.uz

Submission #543076

# Submission time Handle Problem Language Result Execution time Memory
543076 2022-03-29T05:47:02 Z DJ035 Watching (JOI13_watching) C++17
100 / 100
 214 ms 35124 KB 
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,avx,avx2")
#include <bits/stdc++.h>
#define MEM 2222
#define sanic ios_base::sync_with_stdio(0)
#define x first
#define y second
#define pf push_front
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz size()
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pi;
const ll INF = 2e18;
const ll MOD = 998244353;
ll t,n,m,p,q;
ll a[MEM];
ll dp[MEM][MEM];
ll f(ll w){
    //cout << 'P';
    for(int i=0; i<=p; i++) dp[0][i] = 0;
    for(int i=1; i<=n; i++){
        ll k=-1, l=-1;
        //cout << 'q';
        for(int j=1; j<=i; j++){
            if(k==-1 && a[i]-a[j]+1<=w) k = j;
            if(l==-1 && a[i]-a[j]+1<=2*w) l = j;
        }
        //cout << 'r';
        l--, k--;
        //cout << k << ' ' << l << '\n';
        dp[i][0] = dp[l][0]+1;
        for(int j=1; j<=p; j++)
            dp[i][j] = min(dp[k][j-1], dp[l][j]+1);
        //cout << 's';
    }
    return (dp[n][p]<=q);
}

signed main(){
    //sanic; cin.tie(0);
    cin >> n >> p >> q;
    for(int i=1; i<=n; i++) cin >> a[i];
    if(p+q>=n){
        cout << 1;
        return 0;
    }
    //cout << '/';
    sort(a+1, a+n+1);
    ll l=1, r=1e9;
    //cout << '.';
    while(l<=r){
        ll mid=l+r>>1;
        //cout << 'u';
        if(f(mid)) r = mid-1;
        else l = mid+1;
    }
    cout << l;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:56:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   56 |         ll mid=l+r>>1;
      |                ~^~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 692 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 692 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 8400 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 86 ms 8616 KB Output is correct
8 Correct 96 ms 10328 KB Output is correct
9 Correct 140 ms 20148 KB Output is correct
10 Correct 214 ms 35124 KB Output is correct
11 Correct 101 ms 9804 KB Output is correct
12 Correct 152 ms 23708 KB Output is correct
13 Correct 87 ms 8580 KB Output is correct
14 Correct 88 ms 8780 KB Output is correct
15 Correct 89 ms 8532 KB Output is correct