Submission #616211

#	Time	Username	Problem	Language	Result	Execution time	Memory
616211		Soul234	Pictionary (COCI18_pictionary)	C++14	0 / 140	108 ms	22564 KiB

pictionary

#include<bits/stdc++.h>
using namespace std;

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a=b,1 : 0; }
tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a=b,1 : 0; }

const int MOD = 1e9 + 7;

struct UF {
    vi e;
    void init(int n) { e.assign(n, -1); }
    int find(int x) { return e[x] < 0 ? x : e[x] = find(e[x]); }
    bool join(int a, int b) {
        a = find(a), b = find(b);
        if(a == b) return false;
        if(e[a] > e[b]) swap(a,b);
        e[a] += e[b]; e[b] = a;
        return true;
    }
};

const int MX = 1e5+5, LG = 19;
int N, M, Q;
UF dsu;
V<pi> adj[MX];
int par[MX][LG], minInd[MX][LG], dep[MX];

void dfs(int u, int p) {
    each(ed, adj[u]) if(ed.first != p) {
        int v = ed.first, w = ed.second;
        dep[v] = dep[par[v][0] = u] + 1;
        minInd[v][0] = w;
        dfs(v, u);
    }
}

int query(int u, int v) {
    if(dep[u] < dep[v]) swap(u,v);
    int ans = MOD;
    int d = dep[u] - dep[v];
    R0F(i,LG) if(d>>i&1) {
        ckmin(ans, minInd[u][i]);
        u = par[u][i];
    }
    if(u == v) return ans;
    R0F(i,LG) if(par[u][i] != par[v][i]) {
        ckmin(ans, min(minInd[u][i], minInd[v][i]));
        u = par[u][i];
        v = par[v][i];
    }
    return min({ans, par[u][0], par[v][0]});
}

void solve() {
    cin>>N>>M>>Q;
    dsu.init(N+5);
    ROF(i,1,M+1) {
        for(int j = i*2; j<=N; j+=i) {
            if(dsu.join(i, j)) {
                adj[i].pb({j, i});
                adj[j].pb({i, i});
            }
        }
    }
    par[1][0] = 1;
    memset(minInd, 0x3f, sizeof minInd);
    dfs(1, -1);
    FOR(j,1,LG) FOR(i,1,N+1) {
        par[i][j] = par[par[i][j-1]][j-1];
        minInd[i][j] = min(minInd[i][j-1], minInd[par[i][j-1]][j-1]);
    }
    while(Q-->0) {
        int u,v;
        cin>>u>>v;
        cout << M-query(u,v)+1 << nl;
    }
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

pictionary.cpp: In function 'void setIO(std::string)':
pictionary.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pictionary.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
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• Subtask 10: 0 / 14