結果

問題 No.1975 Zigzag Sequence
ユーザー 👑 hos.lyrichos.lyric
提出日時 2022-10-03 08:31:08
言語 D
(dmd 2.106.1)
結果
AC  
実行時間 126 ms / 2,000 ms
コード長 4,965 bytes
コンパイル時間 1,717 ms
コンパイル使用メモリ 161,224 KB
実行使用メモリ 11,684 KB
最終ジャッジ日時 2024-06-22 16:19:42
合計ジャッジ時間 5,097 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge5
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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 1 ms
6,812 KB
testcase_01 AC 1 ms
6,944 KB
testcase_02 AC 1 ms
6,944 KB
testcase_03 AC 13 ms
6,940 KB
testcase_04 AC 6 ms
6,940 KB
testcase_05 AC 105 ms
10,012 KB
testcase_06 AC 72 ms
8,896 KB
testcase_07 AC 14 ms
6,944 KB
testcase_08 AC 69 ms
7,256 KB
testcase_09 AC 103 ms
9,136 KB
testcase_10 AC 72 ms
8,992 KB
testcase_11 AC 82 ms
8,976 KB
testcase_12 AC 19 ms
6,944 KB
testcase_13 AC 1 ms
6,940 KB
testcase_14 AC 1 ms
6,940 KB
testcase_15 AC 1 ms
6,940 KB
testcase_16 AC 2 ms
6,944 KB
testcase_17 AC 1 ms
6,940 KB
testcase_18 AC 40 ms
10,220 KB
testcase_19 AC 42 ms
10,900 KB
testcase_20 AC 64 ms
9,656 KB
testcase_21 AC 65 ms
10,404 KB
testcase_22 AC 83 ms
11,344 KB
testcase_23 AC 82 ms
11,272 KB
testcase_24 AC 96 ms
11,660 KB
testcase_25 AC 95 ms
11,432 KB
testcase_26 AC 108 ms
10,228 KB
testcase_27 AC 126 ms
10,940 KB
testcase_28 AC 97 ms
11,512 KB
testcase_29 AC 98 ms
11,452 KB
testcase_30 AC 98 ms
11,372 KB
testcase_31 AC 97 ms
11,684 KB
testcase_32 AC 43 ms
9,492 KB
testcase_33 AC 44 ms
9,640 KB
testcase_34 AC 109 ms
9,456 KB
testcase_35 AC 110 ms
9,524 KB
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ソースコード

diff # 

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)); }

struct ModInt(uint M_) {
  import std.conv : to;
  alias M = M_;
  uint x;
  this(ModInt a) { x = a.x; }
  this(uint x_) { x = x_ % M; }
  this(ulong x_) { x = cast(uint)(x_ % M); }
  this(int x_) { x = ((x_ %= cast(int)(M)) < 0) ? (x_ + cast(int)(M)) : x_; }
  this(long x_) { x = cast(uint)(((x_ %= cast(long)(M)) < 0) ? (x_ + cast(long)(M)) : x_); }
  ref ModInt opAssign(T)(inout(T) a) if (is(T == uint) || is(T == ulong) || is(T == int) || is(T == long)) { return this = ModInt(a); }
  ref ModInt opOpAssign(string op, T)(T a) {
    static if (is(T == ModInt)) {
      static if (op == "+") { x = ((x += a.x) >= M) ? (x - M) : x; }
      else static if (op == "-") { x = ((x -= a.x) >= M) ? (x + M) : x; }
      else static if (op == "*") { x = cast(uint)((cast(ulong)(x) * a.x) % M); }
      else static if (op == "/") { this *= a.inv(); }
      else static assert(false);
      return this;
    } else static if (op == "^^") {
      if (a < 0) return this = inv()^^(-a);
      ModInt b = this, c = 1U;
      for (long e = a; e; e >>= 1) { if (e & 1) c *= b; b *= b; }
      return this = c;
    } else {
      return mixin("this " ~ op ~ "= ModInt(a)");
    }
  }
  ModInt inv() const {
    uint a = M, b = x; int y = 0, z = 1;
    for (; b; ) { const q = a / b; const c = a - q * b; a = b; b = c; const w = y - cast(int)(q) * z; y = z; z = w; }
    assert(a == 1); return ModInt(y);
  }
  ModInt opUnary(string op)() const {
    static if (op == "+") { return this; }
    else static if (op == "-") { ModInt a; a.x = x ? (M - x) : 0U; return a; }
    else static assert(false);
  }
  ModInt opBinary(string op, T)(T a) const { return mixin("ModInt(this) " ~ op ~ "= a"); }
  ModInt opBinaryRight(string op, T)(T a) const { return mixin("ModInt(a) " ~ op ~ "= this"); }
  bool opCast(T: bool)() const { return (x != 0U); }
  string toString() const { return x.to!string; }
}

enum MO = 10^^9 + 7;
alias Mint = ModInt!MO;

void bAdd(T)(T[] bit, int pos, T val)
in {
  assert(0 <= pos && pos < bit.length, "bAdd: 0 <= pos < |bit| must hold");
}
do {
  for (int x = pos; x < bit.length; x |= x + 1) {
    bit[x] += val;
  }
}

// sum of [0, pos)
T bSum(T)(T[] bit, int pos)
in {
  assert(0 <= pos && pos <= bit.length, "bSum: 0 <= pos <= |bit| must hold");
}
do {
  T ret = 0;
  for (int x = pos - 1; x >= 0; x = (x & (x + 1)) - 1) {
    ret += bit[x];
  }
  return ret;
}


void main() {
  try {
    for (; ; ) {
      const N = readInt;
      auto A = new long[N];
      foreach (i; 0 .. N) {
        A[i] = readLong;
      }
      
      const as = A.dup.sort.uniq.array;
      const asLen = cast(int)(as.length);
      
      auto two = new Mint[N + 1];
      two[0] = 1;
      foreach (i; 0 .. N) {
        two[i + 1] = two[i] * 2;
      }
      
      auto smallL = new Mint[N];
      auto largeL = new Mint[N];
      {
        auto bit = new Mint[N];
        foreach (i; 0 .. N) {
          const pos = as.lowerBound(A[i]);
          smallL[i] = bit.bSum(pos);
          largeL[i] = bit.bSum(asLen) - bit.bSum(pos + 1);
          bit.bAdd(pos, two[i]);
        }
      }
      auto smallR = new Mint[N];
      auto largeR = new Mint[N];
      {
        auto bit = new Mint[N];
        foreach_reverse (i; 0 .. N) {
          const pos = as.lowerBound(A[i]);
          smallR[i] = bit.bSum(pos);
          largeR[i] = bit.bSum(asLen) - bit.bSum(pos + 1);
          bit.bAdd(pos, two[N - 1 - i]);
        }
      }
      debug {
        writeln("smallL = ", smallL);
        writeln("largeL = ", largeL);
        writeln("smallR = ", smallR);
        writeln("largeR = ", largeR);
      }
      
      Mint ans;
      foreach (i; 0 .. N) {
        ans += smallL[i] * smallR[i];
        ans += largeL[i] * largeR[i];
      }
      writeln(ans);
    }
  } catch (EOFException e) {
  }
}
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