Все задачи на 5.10.17 13:00

uts/uts_2017_sum_cpp/4/A.cpp

@@ -0,0 +1,63 @@
+#include <iostream>
+#include <bits/stdc++.h>
+
+using namespace std;
+const int MAXN = 1e6;
+vector<int> tree[MAXN];
+int lel[MAXN];
+int in[MAXN];
+int out[MAXN];
+int timer = 0;
+
+bool is_anc(int a, int b) {
+    return (in[a] <= in[b]) && (out[b] <= out[a]);
+}
+
+void dfs(int v, int p, int h) {
+    lel[v] = h;
+    in[v] = timer++;
+    for (int u : tree[v]) {
+        if (u == p) {
+            continue;
+        }
+        dfs(u, v, h + 1);
+    }
+    out[v] = timer++;
+}
+
+int main() {
+    //assert(freopen("../4/A.txt", "r", stdin));
+    ios_base::sync_with_stdio(false);
+    cin.tie(0);
+
+    int n, m, k;
+
+    cin >> n >> m >> k;
+
+    for (int i = 1; i < n; i++) {
+        int v;
+        cin >> v;
+        tree[i].push_back(--v);
+        tree[v].push_back(i);
+    }
+
+    dfs(0, -1, 0);
+
+    for (int i = 0; i < m; i++) {
+        int vi, ui;
+        cin >> vi >> ui;
+        --vi;
+        --ui;
+
+        if (!is_anc(vi, ui)){
+            cout << "no\n";
+            continue;
+        }
+
+        if (lel[ui] - lel[vi] > k) {
+            cout << "no\n";
+        } else {
+            cout << "yes\n";
+        }
+    }
+}

uts/uts_2017_sum_cpp/4/A.txt

@@ -0,0 +1,6 @@
+5 4 3
+1 1 1 4
+3 3
+1 3
+1 3
+2 4

uts/uts_2017_sum_cpp/4/B.cpp

@@ -0,0 +1,71 @@
+//
+// Created by vlad on 29.06.17.
+//
+
+#include <iostream>
+#include <vector>
+#include <cassert>
+
+using namespace std;
+const int MAXN = 1e6;
+const int MAXLOG = 25;
+vector<int> tree[MAXN];
+int lel[MAXN];
+int in[MAXN];
+int out[MAXN];
+int timer = 0;
+int up[MAXN][MAXLOG];
+
+bool is_anc(int a, int b) {
+    return (in[a] <= in[b]) && (out[b] <= out[a]);
+}
+
+void add(int a, int p) {
+    up[a][0] = p;
+    for (int i = 1; i < MAXLOG; i++) up[a][i] = up[up[a][i - 1]][i - 1];
+}
+
+void dfs(int v, int p, int h) {
+    lel[v] = h;
+    in[v] = timer++;
+    for (int u : tree[v]) {
+        if (u == p) continue;
+        add(u, v);
+        dfs(u, v, h + 1);
+    }
+    out[v] = timer++;
+}
+
+int lca(int a, int b){
+    if (is_anc(a, b)) return a;
+    if (is_anc(b, a)) return b;
+    for(int i = MAXLOG-1; i>=0; --i){
+        int v = up[a][i];
+        if (!is_anc(v, b)) a = v;
+    }
+    return up[a][0];
+}
+
+int main() {
+    //assert(freopen("../4/B.txt", "r", stdin));
+    ios_base::sync_with_stdio(false);
+    cin.tie(0);
+    int n, m;
+    cin >> n;
+    for (int i = 1; i < n; i++) {
+        int pi, qi;
+        cin >> pi >> qi;
+        tree[--pi].push_back(--qi);
+        tree[qi].push_back(pi);
+    }
+    cin >> m;
+    dfs(0, -1, 0);
+    for (int i = 0; i < m; i++) {
+        int ai, bi;
+        cin >> ai >> bi;
+        ai--;
+        bi--;
+        cout << lca(ai, bi) + 1 << endl;
+    }
+    return 0;
+}

uts/uts_2017_sum_cpp/4/B.txt

@@ -0,0 +1,11 @@
+6
+6 3
+5 6
+2 1
+2 4
+4 5
+4
+6 1
+2 4
+4 4
+5 3

uts/uts_2017_sum_cpp/4/read.cpp

@@ -0,0 +1,83 @@
+//
+// Created by vlad on 29.06.17.
+//
+
+#include <cstdio>
+
+/** Interface */
+
+inline int readChar();
+template <class T = int> inline T readInt();
+template <class T> inline void writeInt( T x, char end = 0 );
+inline void writeChar( int x );
+inline void writeWord( const char *s );
+
+/** Read */
+
+static const int buf_size = 4096;
+
+inline int getChar() {
+    static char buf[buf_size];
+    static int len = 0, pos = 0;
+    if (pos == len)
+        pos = 0, len = fread(buf, 1, buf_size, stdin);
+    if (pos == len)
+        return -1;
+    return buf[pos++];
+}
+
+inline int readChar() {
+    int c = getChar();
+    while (c <= 32)
+        c = getChar();
+    return c;
+}
+
+template <class T>
+inline T readInt() {
+    int s = 1, c = readChar();
+    T x = 0;
+    if (c == '-')
+        s = -1, c = getChar();
+    while ('0' <= c && c <= '9')
+        x = x * 10 + c - '0', c = getChar();
+    return s == 1 ? x : -x;
+}
+
+/** Write */
+
+static int write_pos = 0;
+static char write_buf[buf_size];
+
+inline void writeChar( int x ) {
+    if (write_pos == buf_size)
+        fwrite(write_buf, 1, buf_size, stdout), write_pos = 0;
+    write_buf[write_pos++] = x;
+}
+
+template <class T>
+inline void writeInt( T x, char end ) {
+    if (x < 0)
+        writeChar('-'), x = -x;
+
+    char s[24];
+    int n = 0;
+    while (x || !n)
+        s[n++] = '0' + x % 10, x /= 10;
+    while (n--)
+        writeChar(s[n]);
+    if (end)
+        writeChar(end);
+}
+
+inline void writeWord( const char *s ) {
+    while (*s)
+        writeChar(*s++);
+}
+
+struct Flusher {
+    ~Flusher() {
+        if (write_pos)
+            fwrite(write_buf, 1, write_pos, stdout), write_pos = 0;
+    }
+} flusher;