結果
| 問題 |
No.1117 数列分割
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-07-17 22:46:23 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 2,178 ms / 3,000 ms |
| コード長 | 3,938 bytes |
| コンパイル時間 | 992 ms |
| コンパイル使用メモリ | 131,096 KB |
| 実行使用メモリ | 6,948 KB |
| 最終ジャッジ日時 | 2024-06-22 07:44:33 |
| 合計ジャッジ時間 | 22,498 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 26 |
ソースコード
import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;
class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }
bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }
int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }
// T: monoid
// op: T * T -> T
// query(a, b): returns t_a ... t_{b-1}
class SegmentTree(T, alias op) {
import std.functional : binaryFun;
alias opFun = binaryFun!op;
const(T) idT;
int n;
T[] ts;
this(int n_, const(T) idT) {
this.idT = idT;
for (n = 1; n < n_; n <<= 1) {}
ts = new T[n << 1];
ts[] = idT;
}
this(inout(T)[] ts_, const(T) idT) {
this.idT = idT;
const n_ = cast(int)(ts_.length);
for (n = 1; n < n_; n <<= 1) {}
ts = new T[n << 1];
ts[0 .. n] = idT;
ts[n .. n + n_] = ts_[];
ts[n + n_ .. n << 1] = idT;
build();
}
ref T at(int a) {
return ts[n + a];
}
void build() {
foreach_reverse (a; 1 .. n) ts[a] = opFun(ts[a << 1], ts[a << 1 | 1]);
}
void set(int a, const(T) val) {
ts[a += n] = val;
for (; a >>= 1; ) ts[a] = opFun(ts[a << 1], ts[a << 1 | 1]);
}
void mulL(int a, const(T) val) {
set(a, opFun(val, ts[a + n]));
}
void mulR(int a, const(T) val) {
set(a, opFun(ts[a + n], val));
}
T query(int a, int b) const {
T prodL = idT, prodR = idT;
for (a += n, b += n; a < b; a >>= 1, b >>= 1) {
if (a & 1) prodL = opFun(prodL, ts[a++]);
if (b & 1) prodR = opFun(ts[--b], prodR);
}
return opFun(prodL, prodR);
}
}
enum INF = 10L^^18;
void main() {
try {
for (; ; ) {
const N = readInt();
const K = readInt();
const M = readInt();
auto A = new long[N];
foreach (i; 0 .. N) {
A[i] = readLong();
}
auto ASum = new long[N + 1];
foreach (i; 0 .. N) {
ASum[i + 1] = ASum[i] + A[i];
}
auto ps = new Tuple!(long, int)[N + 1];
foreach (i; 0 .. N + 1) {
ps[i] = tuple(ASum[i], i);
}
ps.sort;
auto qs = new int[N + 1];
foreach (j; 0 .. N + 1) {
qs[ps[j][1]] = j;
}
auto crt = new long[N + 1];
crt[] = -INF;
crt[0] = 0;
foreach (k; 0 .. K) {
auto nxt = new long[N + 1];
nxt[] = -INF;
auto seg0 = new SegmentTree!(long, max)(N + 1, -INF);
auto seg1 = new SegmentTree!(long, max)(N + 1, -INF);
foreach (i; k + 1 .. N + 1) {
// push i - 1
seg0.set(qs[i - 1], crt[i - 1] - ASum[i - 1]);
seg1.set(qs[i - 1], crt[i - 1] + ASum[i - 1]);
// get
chmax(nxt[i], seg0.query(0, qs[i]) + ASum[i]);
chmax(nxt[i], seg1.query(qs[i] + 1, N + 1) - ASum[i]);
// pop i - M
if (i - M >= 0) {
seg0.set(qs[i - M], -INF);
seg1.set(qs[i - M], -INF);
}
}
debug {
writeln(k + 1, ": ", nxt);
}
crt = nxt;
}
writeln(crt[N]);
}
} catch (EOFException e) {
}
}