結果
| 問題 |
No.439 チワワのなる木
|
| コンテスト | |
| ユーザー |
 tanzaku
|
| 提出日時 | 2016-10-28 23:04:18 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 402 ms / 5,000 ms |
| コード長 | 6,738 bytes |
| コンパイル時間 | 2,963 ms |
| コンパイル使用メモリ | 91,736 KB |
| 実行使用メモリ | 82,544 KB |
| 最終ジャッジ日時 | 2024-11-24 06:14:40 |
| 合計ジャッジ時間 | 7,590 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 28 |
ソースコード
import java.io.*;
import java.math.*;
import java.util.*;
import java.util.Map.Entry;
import static java.util.Arrays.*;
public class Main {
private static final int mod = (int)1e9+7;
final Random random = new Random(0);
final IOFast io = new IOFast();
// TreeMap<Integer, Integer>[] comb = new TreeMap[100000];
/// MAIN CODE
public void run() throws IOException {
// int TEST_CASE = Integer.parseInt(new String(io.nextLine()).trim());
int TEST_CASE = 1;
while(TEST_CASE-- != 0) {
int n = io.nextInt();
cs = io.next();
// cs = new char[n];
// for (int i = 0; i < n; i++) cs[i] = "cw".charAt(random.nextInt(2));
g = new List[n];
for (int i = 0; i < n; i++) g[i] = new ArrayList<>();
for (int i = 0; i < n - 1; i++) {
int a = io.nextInt() - 1;
int b = io.nextInt() - 1;
// int a = i;
// int b = a + 1;
g[a].add(b);
g[b].add(a);
}
val1 = new long[n];
val2 = new long[n];
dfs(0, -1);
// dump(val1, val2);
io.out.println(dfs2(0, -1, 0, 0));
}
}
List<Integer>[] g;
char[] cs;
long[] val1;
long[] val2;
void dfs(int v, int p) {
if (cs[v] == 'w') {
val1[v]++;
}
for (int t : g[v]) if (t != p) {
dfs(t, v);
val1[v] += val1[t];
val2[v] += val2[t] + (cs[v] == 'w' ? val1[t] : 0);
}
}
long dfs2(int v, int p, long c1, long c2) {
long ans = 0;
// long sum = 0;
c2 += val2[v];
if (p != -1 && cs[v] == 'w') c2 += c1;
c1 += val1[v];
for (int t : g[v]) if (t != p) {
long v2 = c2 - val2[t] - (cs[v] == 'w' ? val1[t] : 0);
long v1 = c1 - val1[t];
ans += dfs2(t, v, v1, v2);
// sum += val2[v];
}
if (cs[v] == 'c') ans += c2;
// dump(v, p, c1, c2, ans);
return ans;
}
/// TEMPLATE
static int gcd(int n, int r) { return r == 0 ? n : gcd(r, n%r); }
static long gcd(long n, long r) { return r == 0 ? n : gcd(r, n%r); }
static <T> void swap(T[] x, int i, int j) { T t = x[i]; x[i] = x[j]; x[j] = t; }
static void swap(int[] x, int i, int j) { int t = x[i]; x[i] = x[j]; x[j] = t; }
void printArrayLn(int[] xs) { for(int i = 0; i < xs.length; i++) io.out.print(xs[i] + (i==xs.length-1?"\n":" ")); }
void printArrayLn(long[] xs) { for(int i = 0; i < xs.length; i++) io.out.print(xs[i] + (i==xs.length-1?"\n":" ")); }
static void dump(Object... o) { System.err.println(Arrays.deepToString(o)); }
void main() throws IOException {
// IOFast.setFileIO("rle-size.in", "rle-size.out");
try { run(); }
catch (EndOfFileRuntimeException e) { }
io.out.flush();
}
public static void main(String[] args) throws IOException { new Main().main(); }
static class EndOfFileRuntimeException extends RuntimeException {
private static final long serialVersionUID = -8565341110209207657L; }
static
public class IOFast {
private BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
private PrintWriter out = new PrintWriter(System.out);
void setFileIn(String ins) throws IOException { in.close(); in = new BufferedReader(new FileReader(ins)); }
void setFileOut(String outs) throws IOException { out.flush(); out.close(); out = new PrintWriter(new FileWriter(outs)); }
void setFileIO(String ins, String outs) throws IOException { setFileIn(ins); setFileOut(outs); }
private static int pos, readLen;
private static final char[] buffer = new char[1024 * 8];
private static char[] str = new char[500*8*2];
private static boolean[] isDigit = new boolean[256];
private static boolean[] isSpace = new boolean[256];
private static boolean[] isLineSep = new boolean[256];
static { for(int i = 0; i < 10; i++) { isDigit['0' + i] = true; } isDigit['-'] = true; isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true; isLineSep['\r'] = isLineSep['\n'] = true; }
public int read() throws IOException { if(pos >= readLen) { pos = 0; readLen = in.read(buffer); if(readLen <= 0) { throw new EndOfFileRuntimeException(); } } return buffer[pos++]; }
public int nextInt() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; int ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
public long nextLong() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; long ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
public char nextChar() throws IOException { while(true) { final int c = read(); if(!isSpace[c]) { return (char)c; } } }
int reads(int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } if(str.length == len) { char[] rep = new char[str.length * 3 / 2]; System.arraycopy(str, 0, rep, 0, str.length); str = rep; } str[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
int reads(char[] cs, int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } cs[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
public char[] nextLine() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isLineSep); try { if(str[len-1] == '\r') { len--; read(); } } catch(EndOfFileRuntimeException e) { ; } return Arrays.copyOf(str, len); }
public String nextString() throws IOException { return new String(next()); }
public char[] next() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); return Arrays.copyOf(str, len); }
// public int next(char[] cs) throws IOException { int len = 0; cs[len++] = nextChar(); len = reads(cs, len, isSpace); return len; }
public double nextDouble() throws IOException { return Double.parseDouble(nextString()); }
public long[] nextLongArray(final int n) throws IOException { final long[] res = new long[n]; for(int i = 0; i < n; i++) { res[i] = nextLong(); } return res; }
public int[] nextIntArray(final int n) throws IOException { final int[] res = new int[n]; for(int i = 0; i < n; i++) { res[i] = nextInt(); } return res; }
public int[][] nextIntArray2D(final int n, final int k) throws IOException { final int[][] res = new int[n][]; for(int i = 0; i < n; i++) { res[i] = nextIntArray(k); } return res; }
public int[][] nextIntArray2DWithIndex(final int n, final int k) throws IOException { final int[][] res = new int[n][k+1]; for(int i = 0; i < n; i++) { for(int j = 0; j < k; j++) { res[i][j] = nextInt(); } res[i][k] = i; } return res; }
public double[] nextDoubleArray(final int n) throws IOException { final double[] res = new double[n]; for(int i = 0; i < n; i++) { res[i] = nextDouble(); } return res; }
}
}