結果
問題 | No.576 E869120 and Rings |
ユーザー |
|
提出日時 | 2017-10-16 10:30:47 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
TLE
(最新)
AC
(最初)
|
実行時間 | - |
コード長 | 2,871 bytes |
コンパイル時間 | 1,596 ms |
コンパイル使用メモリ | 171,752 KB |
実行使用メモリ | 103,636 KB |
最終ジャッジ日時 | 2024-11-17 20:40:21 |
合計ジャッジ時間 | 35,175 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 19 TLE * 8 |
ソースコード
#include "bits/stdc++.h"using namespace std;#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))#define rep(i,j) FOR(i,0,j)#define each(x,y) for(auto &(x):(y))#define mp make_pair#define mt make_tuple#define all(x) (x).begin(),(x).end()#define debug(x) cout<<#x<<": "<<(x)<<endl#define smax(x,y) (x)=max((x),(y))#define smin(x,y) (x)=min((x),(y))#define MEM(x,y) memset((x),(y),sizeof (x))#define sz(x) (int)(x).size()#define pb push_backtypedef long long ll;typedef pair<int, int> pii;typedef vector<int> vi;typedef vector<ll> vll;template<class Val, class Cmp>class SparseTableRMQ {public:SparseTableRMQ() {}SparseTableRMQ(Val *ar, int n) : n(n), data(n) {for (int i = 0; i < n; ++i) data[i] = ar[i];table = buildRMQ();}int queryPos(int l, int r) {int k = lgInt(r - l - 1);int lid = table[l + n*k], rid = table[r + n*k - (1 << k)];return (cmp(data[lid], data[rid])) ? lid : rid;}Val queryValue(int l, int r) {return data[queryPos(l, r)];}private:int n;vector<Val> data;vector<int> table;Cmp cmp;int lgInt(int v) {static const unsigned b[] = { 0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000 };static const unsigned S[] = { 1, 2, 4, 8, 16 };int res = 0;for (int i = 4; i >= 0; i--) {if (v & b[i]) {v >>= S[i];res |= S[i];}}return res;}vector<int> buildRMQ() {int logn = 1;for (int k = 1; k < n; k *= 2) ++logn;vector<int> b(n*logn);for (int i = 0; i < n; ++i)b[i] = i;int cur = 0;for (int k = 1; k < n; k *= 2) {copy(b.begin() + cur, b.begin() + cur + n, b.begin() + cur + n);cur += n;for (int i = 0; i < n - k; ++i) {int idl = b[cur + i], idr = b[cur + i + k];if (cmp(data[idl], data[idr])) {b[cur + i] = idl;} else {b[cur + i] = idr;}}}return b;}};int N, K, color[500005];double dat[500005*2];int check(double x) {rep(i, N) {dat[i] = dat[i + N] = color[i] - x;}rep(i, 2 * N)dat[i + 1] += dat[i];SparseTableRMQ<double, greater<double> > rmq(dat, N * 2);double pre = 0;rep(i, N) {double ma = rmq.queryValue(i + K - 1, i + N);if (ma - pre >= 0)return 1;pre = dat[i];}return 0;}int main(){ios::sync_with_stdio(false);cin.tie(0);string S;cin >> N >> K >> S;rep(i, N)color[i] = S[i] - '0';double l = 0, r = 1, x;rep(ITER, 20) {x = (l + r)*0.5;(check(x) ? l : r) = x;}cout << fixed << setprecision(20);cout << r << endl;}