Submission #700737
Source Code Expand
#!/usr/bin/ruby -w class Solver def init() @n = gets.to_i; @dp = Array.new(@n + 1); @head = Array.new(@n + 1); @m = 0; @to = Array.new(@n * 2); @nxt = Array.new(@n * 2); @mod = 10**9 + 7; for i in 1..@n @dp[i] = Array.new(2, 1); @head[i] = -1; end end def add_edge(a, b) @to[@m] = b; @nxt[@m] = @head[a]; @head[a] = @m; @m += 1; end def readData() init(); i = 1; while i < @n do i += 1; str = gets.split(' '); a = str[0].to_i; b = str[1].to_i; add_edge(a, b); add_edge(b, a); end end def dfs(x, fa) i = @head[x]; while i != -1 do j = @to[i]; i = @nxt[i]; if j == fa next; end dfs(j, x); @dp[x][0] = (@dp[j][0] + @dp[j][1]) % @mod * @dp[x][0] % @mod; @dp[x][1] = @dp[j][0] * @dp[x][1] % @mod; end end def output() puts (@dp[1][0]+@dp[1][1]) % @mod; end end solver = Solver.new(); solver.readData(); solver.dfs(1, 0); solver.output();
Submission Info
Submission Time | |
---|---|
Task | D - 塗り絵 |
User | hongrock |
Language | Ruby (2.3.3) |
Score | 100 |
Code Size | 1006 Byte |
Status | AC |
Exec Time | 493 ms |
Memory | 13308 KB |
Judge Result
Set Name | All | ||
---|---|---|---|
Score / Max Score | 100 / 100 | ||
Status |
|
Set Name | Test Cases |
---|---|
All | 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
000.txt | AC | 18 ms | 1916 KB |
001.txt | AC | 17 ms | 1788 KB |
002.txt | AC | 386 ms | 12028 KB |
003.txt | AC | 477 ms | 13308 KB |
004.txt | AC | 328 ms | 11260 KB |
005.txt | AC | 476 ms | 13308 KB |
006.txt | AC | 459 ms | 12924 KB |
007.txt | AC | 477 ms | 13308 KB |
008.txt | AC | 357 ms | 11516 KB |
009.txt | AC | 489 ms | 13308 KB |
010.txt | AC | 356 ms | 11516 KB |
011.txt | AC | 480 ms | 13308 KB |
012.txt | AC | 292 ms | 8316 KB |
013.txt | AC | 473 ms | 13308 KB |
014.txt | AC | 239 ms | 7804 KB |
015.txt | AC | 487 ms | 13308 KB |
016.txt | AC | 318 ms | 10876 KB |
017.txt | AC | 493 ms | 13308 KB |
018.txt | AC | 102 ms | 4348 KB |
019.txt | AC | 480 ms | 13308 KB |
020.txt | AC | 63 ms | 3068 KB |
021.txt | AC | 477 ms | 13308 KB |