QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#248061 | #7689. Flipping Cards | Yshanqian | WA | 1ms | 5524kb | C++14 | 2.0kb | 2023-11-11 17:18:48 | 2023-11-11 17:18:50 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define pi acos(-1)
#define xx first
#define yy second
#define endl "\n"
#define lowbit(x) x & (-x)
#define int long long
#define ull unsigned long long
#define pb push_back
typedef pair<int, int> PII;
typedef pair<double, double> PDD;
#define max(a, b) (((a) > (b)) ? (a) : (b))
#define min(a, b) (((a) < (b)) ? (a) : (b))
#define Ysanqian ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
const int N = 1e6 + 10, M = 1010, inf = 0x3f3f3f3f, mod = 18446, P = 13331;
const double eps = 1e-8;
int n;
int s[N];
int b[N];
PII p[N];
bool check(int mid)
{
for (int i = 1; i <= n; i++)
{
if (p[i].xx < mid && p[i].yy >= mid)
b[i] = 1;
else if (p[i].xx >= mid && p[i].yy < mid)
b[i] = -1;
else
b[i] = 0;
s[i] += s[i - 1] + b[i];
}
int l = 1, r = 1;
int ansl = 0, ansr = 0;
vector<int> ans;
int mx = 0;
while (r <= n)
{
if (s[r] - s[l - 1] >= 0)
{
if (s[r] - s[l - 1] > mx)
{
mx = s[r] - s[l - 1];
ansl = l;
ansr = r;
}
}
else
l = r + 1;
r++;
}
for (int i = 1; i <= n; i++)
{
if (i >= ansl && i <= ansr)
ans.pb(p[i].yy);
else
ans.pb(p[i].xx);
}
sort(ans.begin(), ans.end());
int x = ans[n / 2];
if (x >= mid)
return true;
return false;
}
void solve()
{
cin >> n;
for (int i = 1; i <= n; i++)
cin >> p[i].xx >> p[i].yy;
int l = 0, r = 1e9 + 10;
while (l < r)
{
int mid = l + r + 1 >> 1;
if (check(mid))
l = mid;
else
r = mid - 1;
}
cout << r << endl;
}
signed main()
{
Ysanqian;
int T;
T = 1;
// cin >> T;
for (int cases = 1; cases <= T; ++cases)
{
// cout<<"Case #"<<cases<<": ";
solve();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 5444kb
input:
5 3 6 5 2 4 7 6 4 2 8
output:
6
result:
ok 1 number(s): "6"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5488kb
input:
1 2 1
output:
2
result:
ok 1 number(s): "2"
Test #3:
score: 0
Accepted
time: 0ms
memory: 5484kb
input:
1 212055293 384338286
output:
384338286
result:
ok 1 number(s): "384338286"
Test #4:
score: -100
Wrong Answer
time: 1ms
memory: 5524kb
input:
99 749159996 323524232 125448341 365892333 481980673 143665393 394405973 44741918 687549448 513811513 287088118 385131171 11865696 666468353 449920567 373650719 671547289 116780561 41003675 671513243 351534153 507850962 374160874 985661954 222519431 600582098 987220654 704142246 856147059 37783620 1...
output:
500976567
result:
wrong answer 1st numbers differ - expected: '528957505', found: '500976567'