結果
| 問題 |
No.703 ゴミ拾い Easy
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-01-23 15:32:07 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 141 ms / 1,500 ms |
| コード長 | 2,829 bytes |
| コンパイル時間 | 780 ms |
| コンパイル使用メモリ | 121,900 KB |
| 実行使用メモリ | 33,972 KB |
| 最終ジャッジ日時 | 2024-06-13 03:32:08 |
| 合計ジャッジ時間 | 6,516 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 46 |
ソースコード
import std.conv, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.container, std.math, std.numeric, std.range, 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; }
void chmin(T)(ref T t, in T f) { if (t > f) t = f; }
void chmax(T)(ref T t, in T f) { if (t < f) t = f; }
int binarySearch(T)(in T[] as, in bool delegate(T) test) { int low = -1, upp = cast(int)(as.length); for (; low + 1 < upp; ) { int mid = (low + upp) >> 1; (test(as[mid]) ? low : upp) = mid; } return upp; }
int lowerBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a < val)); }
int upperBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a <= val)); }
int N;
long[] A, X, Y;
void main() {
try {
for (; ; ) {
N = readInt();
A = new long[N];
foreach (i; 0 .. N) {
A[i] = readLong();
}
X = new long[N];
foreach (i; 0 .. N) {
X[i] = readLong();
}
Y = new long[N];
foreach (i; 0 .. N) {
Y[i] = readLong();
}
debug {
auto dp = new long[N];
foreach (i; 0 .. N) {
dp[i] = (X[0] - A[i])^^2 + (Y[0] - 0)^^2;
foreach (j; 1 .. i + 1) {
chmin(dp[i], dp[j - 1] + (X[j] - A[i])^^2 + (Y[j] - 0)^^2);
}
}
writeln(dp);
}
/*
dp[i] = min{ dp[j - 1] + (X[j] - A[i])^2 + (Y[j] - 0)^2 | 0 <= j <= i }
= min{ (dp[j - 1] + X[j]^2 + Y[j]^2) - (2 X[j]) A[i] } + A[i]^2
*/
long ans;
auto q = new Tuple!(long, long)[N + 1];
int qHead, qTail;
foreach (i; -1 .. N) {
long z;
if (i == -1) {
z = 0;
} else {
for (; qTail - qHead >= 2 && q[qHead][0] - q[qHead][1] * A[i] >= q[qHead + 1][0] - q[qHead + 1][1] * A[i]; ++qHead) {}
z = q[qHead][0] - q[qHead][1] * A[i] + A[i]^^2;
}
debug {
writeln(i, " ", z);
}
if (i == N - 1) {
ans = z;
} else {
const p = tuple(z + X[i + 1]^^2 + Y[i + 1]^^2, 2 * X[i + 1]);
// ([-2][0] - [-1][0]) / ([-2][1] - [-1][1]) >= ([-2][0] - p[0]) / ([-2][1] - p[1])
for (; qTail - qHead >= 2 && (q[qTail - 2][0] - q[qTail - 1][0]) * (q[qTail - 2][1] - p[1]) >= (q[qTail - 2][0] - p[0]) * (q[qTail - 2][1] - q[qTail - 1][1]); --qTail) {}
q[qTail++] = p;
}
}
writeln(ans);
}
} catch (EOFException e) {
}
}