#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
// #pragma GCC optimize("Ofast,unroll-loops,fast-math")
// #pragma GCC target("popcnt")
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353; // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(1e5)+100;
const int M = ll(2e5) + 100;
const long long inf = 5e18;
const long double eps = 1e-15L;
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
int n, p, q, a[N];
int get(int l, int r) {
return upper_bound(a + 1, a + n + 1, r) - a - (lower_bound(a + 1, a + n + 1, l) - a);
}
bool check(int w, int p, int q) {
vector<pair<int, int> > vec;
for(int i = 1; i <= n;) {
if(p) {
int next = a[i] + w - 1;
vec.pb({a[i], a[i] + w - 1});
p --;
if(vec.size() >= 2) {
// switch last two for a 2w photo
int l1 = vec[vec.size() - 2].ff, r1 = vec[vec.size() - 2].ss;
// l1 ... next if the same as taking l1...r1, a[i] ... next
if(get(l1, next) == get(l1, r1) + get(a[i], next)) {
// take those two back for the 2w
p += 2;
q --;
}
vec.pop_back();
vec.pop_back();
}
while(a[i] <= next) i ++;
} else if(q) {
// no p left so only choice is to use q at many time as we can
int next = a[i] + 2 * w - 1;
q --;
while(a[i] <= next) i ++;
} else {
return false;
}
}
return true;
}
void Baizho() {
cin>>n>>p>>q;
for(int i = 1; i <= n; i ++) {
cin>>a[i];
}
sort(a + 1, a + n + 1);
int l = 0, r = 1e9;
while(l <= r) {
int mid = (l + r) / 2;
if(check(mid, p, q)) r = mid - 1;
else l = mid + 1;
}
cout<<r + 1<<"\n";
}
signed main() {
// Freopen("nondec");
ios_base::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
// precalc();
int ttt = 1;
// cin>>ttt;
for(int i=1; i<=ttt; i++) {Baizho(); }
}
Compilation message
watching.cpp: In function 'void Freopen(std::string)':
watching.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
348 KB |
Output is correct |
| 2 |
Correct |
1 ms |
464 KB |
Output is correct |
| 3 |
Execution timed out |
1079 ms |
348 KB |
Time limit exceeded |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Execution timed out |
1065 ms |
348 KB |
Time limit exceeded |
| 4 |
Halted |
0 ms |
0 KB |
- |
