結果
| 問題 |
No.886 Direct
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-09-13 21:57:26 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 492 ms / 4,000 ms |
| コード長 | 3,378 bytes |
| コンパイル時間 | 1,757 ms |
| コンパイル使用メモリ | 153,956 KB |
| 実行使用メモリ | 77,764 KB |
| 最終ジャッジ日時 | 2024-06-22 02:33:27 |
| 合計ジャッジ時間 | 7,549 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 32 |
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.complex, std.container, std.math, 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(long M) {
long x;
this(in ModInt a) { x = a.x; }
this(in long a) { x = a % M; if (x < 0) x += M; }
ref ModInt opAssign(in long a) { return this = ModInt(a); }
ref ModInt opOpAssign(string op)(in ModInt a) {
static if (op == "+") { x += a.x; if (x >= M) x -= M; }
else static if (op == "-") { x -= a.x; if (x < 0) x += M; }
else static if (op == "*") { x *= a.x; x %= M; }
else static assert(false);
return this;
}
ref ModInt opOpAssign(string op)(in long a) { return mixin("this " ~ op ~ "= ModInt(a)"); }
ModInt opUnary(string op)() const if (op == "-") { return ModInt(-x); }
ModInt opBinary(string op, T)(in T a) const { return mixin("ModInt(this) " ~ op ~ "= a"); }
ModInt opBinaryRight(string op)(in long a) const { return mixin("ModInt(a) " ~ op ~ "= this"); }
string toString() const { return x.to!string; }
}
enum MO = 10L^^9 + 7;
alias Mint = ModInt!MO;
void main() {
try {
for (; ; ) {
const H = readInt();
const W = readInt();
const lim = max(H, W);
auto minp = new int[lim + 1];
auto meb = new int[lim + 1];
foreach (p; 2 .. lim + 1) {
if (minp[p] == 0) {
for (int n = p; n <= lim; n += p) {
minp[n] = p;
}
}
}
meb[1] = 1;
foreach (n; 2 .. lim + 1) {
if (n / minp[n] % minp[n] == 0) {
meb[n] = 0;
} else {
meb[n] = -meb[n / minp[n]];
}
}
debug {
writeln("minp = ", minp[0 .. min(31, $)]);
writeln("meb = ", meb[0 .. min(31, $)]);
}
auto cntH = new Mint[lim + 1];
auto cntW = new Mint[lim + 1];
foreach (d; 1 .. lim + 1) {
for (int n = d; n <= lim; n += d) {
cntH[d] += max(H - n, 0);
cntW[d] += max(W - n, 0);
}
}
debug {
if (lim <= 10) {
writeln("cntH = ", cntH);
writeln("cntW = ", cntW);
}
}
Mint ans;
foreach (d; 1 .. lim + 1) {
ans += meb[d] * cntH[d] * cntW[d];
}
ans *= 2;
ans += Mint(1) * H * (W - 1);
ans += Mint(1) * (H - 1) * W;
writeln(ans);
}
} catch (EOFException e) {
}
}