oj.uz

Submission #384836

# Submission time Handle Problem Language Result Execution time Memory
384836 2021-04-02T11:52:21 Z cpp219 Watching (JOI13_watching) C++14
50 / 100
 1000 ms 32108 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 2e3 + 6;
const ll Log2 = 19;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
vector<ll> v;
ll n,P,Q,a[N],dp[N][N],val;

ll Find(ll x){
	return lower_bound(v.begin(),v.end(),x) - v.begin() + 1;
}

ll f(ll pos,ll p){
	if (pos > n) return 0;
	if (dp[pos][p] != -1) return dp[pos][p];
	ll ans = inf,nxt1 = Find(a[pos] + val),nxt2 = Find(a[pos] + val*2);
	if (p) ans = f(nxt1,p - 1);
	ans = min(ans,1 + f(nxt2,p));
	return dp[pos][p] = ans;
}

bool chk(ll m){
	memset(dp,-1,sizeof(dp)); val = m;
	return f(1,P) <= Q;
}

int main(){
    //ios_base::sync_with_stdio(0);
    //cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".in", "r")){
        freopen(task".in", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n>>P>>Q;
    for (ll i = 1;i <= n;i++) cin>>a[i]; sort(a + 1,a + n + 1);
    for (ll i = 1;i <= n;i++) v.push_back(a[i]); v.push_back(inf);
    if (P + Q >= n) return cout<<1,0;
    ll l,m,h; l = 0; h = inf;
    while(l <= h){
    	m = (l + h)/2;
    	if (chk(m)) h = m - 1;
    	else l = m + 1;
	}
	cout<<l;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:41:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   41 |     for (ll i = 1;i <= n;i++) cin>>a[i]; sort(a + 1,a + n + 1);
      |     ^~~
watching.cpp:41:42: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   41 |     for (ll i = 1;i <= n;i++) cin>>a[i]; sort(a + 1,a + n + 1);
      |                                          ^~~~
watching.cpp:42:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   42 |     for (ll i = 1;i <= n;i++) v.push_back(a[i]); v.push_back(inf);
      |     ^~~
watching.cpp:42:50: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   42 |     for (ll i = 1;i <= n;i++) v.push_back(a[i]); v.push_back(inf);
      |                                                  ^
watching.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   37 |         freopen(task".in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 137 ms 31852 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 136 ms 31852 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 138 ms 31852 KB Output is correct
8 Correct 140 ms 31980 KB Output is correct
9 Correct 136 ms 31852 KB Output is correct
10 Correct 139 ms 31852 KB Output is correct
11 Correct 137 ms 31888 KB Output is correct
12 Correct 139 ms 31980 KB Output is correct
13 Correct 137 ms 31852 KB Output is correct
14 Correct 138 ms 31852 KB Output is correct
15 Correct 138 ms 31980 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 138 ms 31852 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 2 ms 364 KB Output is correct
6 Correct 2 ms 364 KB Output is correct
7 Correct 145 ms 31980 KB Output is correct
8 Correct 384 ms 32088 KB Output is correct
9 Correct 941 ms 32108 KB Output is correct
10 Execution timed out 1097 ms 32108 KB Time limit exceeded
11 Halted 0 ms 0 KB -