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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#244182 | #7689. Flipping Cards | ycccc319# | WA | 1ms | 3544kb | C++17 | 1.7kb | 2023-11-08 21:46:26 | 2023-11-08 21:46:26 |
Judging History
answer
#include <bits/stdc++.h>
#define ll long long
using namespace std;
int tmp[300010][4];
int n;
int a[300010],b[300010];
bool check(ll x)
{
for (int i = 1; i <= n; i++) {
if (a[i] < x) tmp[i][1] = 0;
else tmp[i][1] = 1;
}
for (int i = 1; i <= n; i++) {
if (b[i] < x) tmp[i][2] = 0;
else tmp[i][2] = 1;
}
for (int i = 1; i <= n; i++) {
tmp[i][3] = tmp[i][2] - tmp[i][1];
}
int sum[n + 1];
sum[1] = tmp[1][3];
int id = 1;
int mx{sum[1]}, l = 1, r = 1;
for (int i = 2; i <= n; i++) {
sum[i] = sum[i - 1] + tmp[i][3];
if (sum[i] < sum[id])id = i;
if (mx < sum[i] - sum[id])l = id, r = i, mx = sum[i] - sum[id];
}
int ans[n + 1];
// for (int i = 1; i <= n; i++) cout<<tmp[i][1]<<" ";
// cout<<endl;
// for (int i = 1; i <= n; i++) cout<<tmp[i][2]<<" ";
// cout<<endl;
// for (int i = 1; i <= n; i++) cout<<tmp[i][3]<<" ";
// cout<<endl;
// cout<<l<<" "<<r<<endl;
for (int i = 1; i <= l - 1; i++)ans[i] = tmp[i][1];
for (int i = l; i <= r; i++) ans[i]= tmp[i][1] + tmp[i][3];
for (int i = r + 1; i <= n; i++) ans[i] = tmp[i][1];
ll o = 0;
for (int i = 1; i <= n; i++) if (ans[i] >= 1) o++;
if(o>=(n+1)/2) return 1;
else return 0;
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>a[i]>>b[i];
}
//test
///cout<<check(5)<<endl;
int L = 0, R = 1e9+10;
int as = 0;
while (L < R)
{
int x = (R - L >> 1) + L;
if(check(x))L = x + 1, as = x;
else R = x;
// cout<<L<<" "<<R<<endl;
}
cout<<L;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3464kb
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: 0ms
memory: 3320kb
input:
1 2 1
output:
2
result:
ok 1 number(s): "2"
Test #3:
score: -100
Wrong Answer
time: 1ms
memory: 3544kb
input:
1 212055293 384338286
output:
384338287
result:
wrong answer 1st numbers differ - expected: '384338286', found: '384338287'