Submission #256976

#	Time	Username	Problem	Language	Result	Execution time	Memory
256976		Pankin	Pictionary (COCI18_pictionary)	C++14	140 / 140	196 ms	25616 KiB

pictionary

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/*
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("-O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
*/

#define mp make_pair
#define ll long long
#define ld long double
#define pb push_back
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fs first
#define sc second
#define getfiles ifstream cin("input.txt"); ofstream cout("output.txt");
#define endl '\n'
#define pii pair<int, int>

const int INF = 2000000005;
const ll BIG_INF = 2000000000000000005;
const int mod = 1000000007;
const int P = 31;
const ld PI = 3.141592653589793238462643;
const double eps = 1e-9;

using namespace std;
using namespace __gnu_pbds;

bool valid(int x, int y, int n, int m) {
    return x >= 0 && y >= 0 && x < n && y < m;
}

mt19937 rng(1999999973);

typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int N = 100000 + 50;

int n, m, q, ans[N], p[N], x[N], y[N], h[N], dp[N][20], mn[N][20];

vector<pii> g[N];

int find_set(int v) {
    if (p[v] == v)
        return v;
    p[v] = find_set(p[v]);
    return p[v];
}

inline void add_edge(int u, int v, int day) {
    if (find_set(u) == find_set(v))
        return;

    p[find_set(u)] = find_set(v);

    g[u].pb(mp(v, day));
    g[v].pb(mp(u, day));
}

void buildTree(int v, int p, int dist) {
    mn[v][0] = dist;
    dp[v][0] = p;

    for (int j = 1; j < 20; j++) {
        dp[v][j] = dp[dp[v][j - 1]][j - 1];
        mn[v][j] = min(mn[v][j - 1], mn[dp[v][j - 1]][j - 1]);
    }

    for (int i = 0; i < g[v].size(); i++) {
        int to = g[v][i].fs;
        if (to == p)
            continue;
        h[to] = h[v] + 1;
        buildTree(to, v, g[v][i].sc);
    }
}

inline int lca(int u, int v) {
    if (h[u] < h[v])
        swap(u, v);
    for (int j = 19; j >= 0; j--) {
        if (h[dp[u][j]] >= h[v])
            u = dp[u][j];
    }
    if (u == v)
        return u;
    for (int j = 19; j >= 0; j--) {
        if (dp[u][j] != dp[v][j]) {
            u = dp[u][j];
            v = dp[v][j];
        }
    }
    return dp[u][0];
}

inline int getMinUpper(int v, int p) {
    int ans = m;
    for (int j = 19; j >= 0; j--) {
        if (h[dp[v][j]] >= h[p]) {
            ans = min(ans, mn[v][j]);
            v = dp[v][j];
        }
    }

    return ans;
}

inline int getMin(int u, int v) {
    int lc = lca(u, v);
    return min(getMinUpper(u, lc), getMinUpper(v, lc));
}

signed main() {
    fast_io;


    cin >> n >> m >> q;

    for (int i = 1; i <= n; i++) {
        p[i] = i;
    }

    for (int i = 0; i < q; i++) {
        cin >> x[i] >> y[i];
    }
    for (int i = m; i >= 1; i--) {
        for (int j = i + i; j <= n; j += i) {
            add_edge(i, j, i);
        }
    }

    buildTree(1, 1, m);

    for (int i = 0; i < q; i++) {
        cout << m + 1 - getMin(x[i], y[i]) << endl;
    }

    return 0;
}

Compilation message (stderr)

pictionary.cpp: In function 'void buildTree(int, int, int)':
pictionary.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < g[v].size(); i++) {
                     ~~^~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14