結果
問題 | No.731 等差数列がだいすき |
ユーザー | uwi |
提出日時 | 2018-09-07 21:31:51 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 133 ms / 1,500 ms |
コード長 | 3,679 bytes |
コンパイル時間 | 4,405 ms |
コンパイル使用メモリ | 86,220 KB |
実行使用メモリ | 54,120 KB |
最終ジャッジ日時 | 2024-11-29 05:37:17 |
合計ジャッジ時間 | 8,073 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 129 ms
53,700 KB |
testcase_01 | AC | 127 ms
53,984 KB |
testcase_02 | AC | 127 ms
54,048 KB |
testcase_03 | AC | 117 ms
52,904 KB |
testcase_04 | AC | 128 ms
53,916 KB |
testcase_05 | AC | 130 ms
54,000 KB |
testcase_06 | AC | 127 ms
53,848 KB |
testcase_07 | AC | 128 ms
54,000 KB |
testcase_08 | AC | 128 ms
53,840 KB |
testcase_09 | AC | 131 ms
53,852 KB |
testcase_10 | AC | 129 ms
53,880 KB |
testcase_11 | AC | 130 ms
53,840 KB |
testcase_12 | AC | 133 ms
53,932 KB |
testcase_13 | AC | 133 ms
53,960 KB |
testcase_14 | AC | 129 ms
53,840 KB |
testcase_15 | AC | 114 ms
52,764 KB |
testcase_16 | AC | 132 ms
54,092 KB |
testcase_17 | AC | 128 ms
53,896 KB |
testcase_18 | AC | 130 ms
54,120 KB |
testcase_19 | AC | 131 ms
54,048 KB |
testcase_20 | AC | 127 ms
53,884 KB |
ソースコード
package contest180907; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.InputMismatchException; public class C { InputStream is; PrintWriter out; String INPUT = ""; void solve() { int n = ni(); int[] a = na(n); double sxy = 0; double sx = 0, sy = 0; double sx2 = 0; for(int i = 0;i < n;i++) { sxy += (double)i*a[i]; sx += (double)i; sy += (double)a[i]; sx2 += (double)i*i; } double A = (n*sxy - sx*sy) / (n*sx2-sx*sx); double B = (sx2*sy-sxy*sx) / (n*sx2-sx*sx); out.printf("%.14f %.14f\n", B, A); double cost = 0; for(int i = 0;i < n;i++) { cost += (a[i] - (A*i+B))*(a[i] - (A*i+B)); } out.printf("%.14f\n", cost); } double f(double h, int[] a, int ind) { int n = a.length; double c = 0; for(int i = 0;i < n;i++) { c += Math.abs(a[ind] + h*(i-ind) - a[i]); } return c; } void run() throws Exception { is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); long s = System.currentTimeMillis(); solve(); out.flush(); if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); // Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){ // @Override // public void run() { // long s = System.currentTimeMillis(); // solve(); // out.flush(); // if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); // } // }; // t.start(); // t.join(); } public static void main(String[] args) throws Exception { new C().run(); } private byte[] inbuf = new byte[1024]; public int lenbuf = 0, ptrbuf = 0; private int readByte() { if(lenbuf == -1)throw new InputMismatchException(); if(ptrbuf >= lenbuf){ ptrbuf = 0; try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf <= 0)return -1; } return inbuf[ptrbuf++]; } private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); } private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; } private double nd() { return Double.parseDouble(ns()); } private char nc() { return (char)skip(); } private String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ') sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private char[] ns(int n) { char[] buf = new char[n]; int b = skip(), p = 0; while(p < n && !(isSpaceChar(b))){ buf[p++] = (char)b; b = readByte(); } return n == p ? buf : Arrays.copyOf(buf, p); } private int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private long[] nal(int n) { long[] a = new long[n]; for(int i = 0;i < n;i++)a[i] = nl(); return a; } private char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private int[][] nmi(int n, int m) { int[][] map = new int[n][]; for(int i = 0;i < n;i++)map[i] = na(m); return map; } private int ni() { return (int)nl(); } private long nl() { long num = 0; int b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } }