//#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
#define debug(s) cout<< #s <<" = "<< s <<endl
#define all(v) (v).begin(), (v).end()
#define KeepUnique(v) (v).erase( unique(all(v)), v.end() )
#define MEMSET(a,val) memset(a, val, sizeof a)
#define PB push_back
#define endl '\n'
typedef long long ll;
inline int myrand(int l, int r) {
int ret = rand(); ret <<= 15; ret ^= rand();
if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
return ret;
}
template <typename F, typename S>
ostream& operator << (ostream& os, const pair< F, S>& p) {
return os<<"(" <<p.first<<", "<<p.second<<")"; }
typedef pair<int, int> ii;
template<typename T> using min_pq =
priority_queue<T, vector<T>, greater<T> >;
//int dx[] = {-1, +0, +1, +0};
//int dy[] = {+0, +1, +0, -1};
typedef long long ll;
ll scale = 10000;
ll read() {
ll x, y;
scanf("%lld.%lld", &x, &y);
while(y * 10LL < scale) y *= 10LL;
ll ret = x * scale + y;
return ret;
}
const int maxn = 100010;
vector<ll> L, R, LR;
int n;
ll solve(int k) {
// ll final = 0;
// int ret = -1, lo = 0, hi = min(n, k);
// while(lo <= hi) {
// int mid = lo + hi >> 1;
// int rem = min(k - mid, n);
// if(L[mid] > R[rem]) {
// hi = mid - 1;
// } else {
// ret = mid;
// lo = mid + 1;
// }
// } assert(ret != -1);
// final = L[ret];
// ret = -1, lo = 0, hi = min(n, k);
// while(lo <= hi) {
// int mid = lo + hi >> 1;
// int rem = min(k - mid, n);
// if(R[mid] > L[rem]) {
// hi = mid - 1;
// } else {
// ret = mid;
// lo = mid + 1;
// }
// } assert(ret != -1);
// final = max(final, R[ret]);
// return final - scale * k;
ll ret = 0;
for(int i = 0; i <= min(k, n); i++) {
ret = max(ret, min(L[i], R[min(n, k - i)]));
} return ret - k * scale;
}
int32_t main () {
cin >> n;
L.resize(n), R.resize(n);
for(int i = 0; i < n; i++) {
L[i] = read();
R[i] = read();
}
sort(all(L)), sort(all(R));
reverse(all(L)), reverse(all(R));
for(int i = 1; i < n; i++) L[i] += L[i - 1], R[i] += R[i - 1];
L.insert(L.begin(), 0); R.insert(R.begin(), 0);
ll mx = 0;
for(int i = 0; i <= (n << 1); i++) {
mx = max(mx, solve(i));
} cout << fixed << setprecision(4) << double(mx) / double(scale) << endl;
}
Compilation message
sure.cpp: In function 'int myrand(int, int)':
sure.cpp:17:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
^~
sure.cpp:17:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
^~~
sure.cpp: In function 'll read()':
sure.cpp:37:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%lld.%lld", &x, &y);
~~~~~^~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
432 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
432 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
432 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
