結果
| 問題 | No.673 カブトムシ |
| コンテスト | |
| ユーザー |
tanzaku
|
| 提出日時 | 2017-03-18 11:55:52 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 49 ms / 2,000 ms |
| コード長 | 3,464 bytes |
| 記録 | |
| コンパイル時間 | 3,674 ms |
| コンパイル使用メモリ | 81,476 KB |
| 実行使用メモリ | 50,232 KB |
| 最終ジャッジ日時 | 2024-06-30 00:48:36 |
| 合計ジャッジ時間 | 4,590 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 14 |
ソースコード
import java.io.*;
import java.util.*;
public class _p767_Validate {
public static void main(String[] args) throws IOException {
new _p767_Validate().solve();
}
static int mod = (int)1e9+7;
void solve() throws IOException {
try (final InputValidator in = new InputValidator(System.in)) {
// try (final Scanner in = new Scanner(System.in)) {
long B = in.nextLong(1, 1_000000_000000L) % mod;
in.space();
long C = in.nextLong(1, 1_000000_000000L) % mod;
in.space();
long D = in.nextLong(1, 1_000000_000000L);
in.newLine();
in.eof();
long[][] mat = new long[][]{
new long[]{C,1,},
new long[]{0,1,},
};
mat = powmat(D, mod, mat);
long[][] x = new long[][]{
new long[]{0,},
new long[]{C,},
};
long v = mulmat(mat, x, mod)[0][0];
System.out.println(B * v % mod);
}
}
// long
// a [n,v] * b [v,m] => c[n,m]
static long[][] mulmat(long[][] a, long[][] b, int mod) {
final long BIG = (2L * mod) * (2L * mod);
assert(a[0].length == b.length);
final int n = a.length;
final int v = b.length;
final int m = b[0].length;
long[][] res = new long[n][m];
for(int i = 0; i < n; i++)
for(int k = 0; k < v; k++) {
final long aa = a[i][k];
for(int j = 0; j < m; j++) {
res[i][j] += aa * b[k][j];
if(res[i][j] >= BIG) res[i][j] -= BIG;
}
}
for(int i = 0; i < n; i++)
for(int j = 0; j < m; j++)
res[i][j] %= mod;
return res;
}
static long[][] powmat(long r, int mod, long[][] mat) {
final int n = mat.length;
long[][] x = new long[n][n];
for(int i = 0; i < n; i++) {
x[i][i] = 1;
}
for(;r > 0; r >>>= 1) {
if((r&1) == 1) {
x = mulmat(x, mat, mod);
}
mat = mulmat(mat, mat, mod);
}
return x;
}
// for debug
static void dump(Object... o) {
System.err.println(Arrays.deepToString(o));
}
static class InputValidator implements Closeable {
final InputStream in;
final int NO_BUFFER = -2;
int buffer;
public InputValidator(final InputStream in) {
this.in = in;
buffer = NO_BUFFER;
}
int read() throws IOException {
final int res = buffer == NO_BUFFER ? in.read() : buffer;
buffer = NO_BUFFER;
return res;
}
void unread(int ch) throws IOException {
buffer = ch;
}
// [low, high]
long nextLong(long low, long high) throws IOException {
long val = 0;
int ch = -1;
boolean read = false;
while (true) {
ch = read();
if (!Character.isDigit(ch)) break;
read = true;
val = val * 10 + ch - '0';
check(val <= high);
}
check(read);
check(ch >= 0);
check(val >= low);
unread(ch);
return val;
}
int nextInt(int low, int high) throws IOException { return (int)nextLong(low, high); }
int[] nextInts(int n, int low, int high) throws IOException {
int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt(low, high);
if (i + 1 != n) space();
}
newLineOrEOF();
return res;
}
void space() throws IOException { int ch = read(); check(ch == ' '); }
void newLine() throws IOException {
int ch = read();
if (ch == '\r') ch = read();
check(ch == '\n');
}
void newLineOrEOF() throws IOException { int ch = read(); check(ch == '\r' || ch == '\n' || ch < 0); }
void eof() throws IOException { int ch = read(); check(ch < 0); }
void check(boolean b) { if (!b) throw new RuntimeException(); }
@Override
public void close() throws IOException {
}
}
}
tanzaku