Submission #1066855

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066855		vjudge1	Dynamic Diameter (CEOI19_diameter)	C++17	0 / 100	673 ms	1048576 KiB

diameter

///*** Sown_Vipro ***///
/// ->TUYEN QUOC GIA<- ///

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("popcnt")
#define F first
#define S second
#define pb push_back
#define pi pair<int, int>
#define pii pair<int, pair<int, int> >
#define all(a) a.begin(), a.end()
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define REP(i, a, b) for(int i = a; i >= b; --i)
#define inp(name) if(fopen(name, "r")) freopen(name, "r", stdin);
#define out(name) if(fopen(name, "w")) freopen(name, "w", stdout);
#define szz(s) int(s.size())
const int N = 1e6 + 5, MAX = 1e6, oo = 1e9 + 5, MOD = 1e9 + 7;
int n, q, TIME, stt;
int s[N], p[N], h[N], nxt[N];
int chain[N], key[N], in[N], lz[4 * N], rs[4 * N];
pi st[4 * N];
pii Q[N];
vector<pi> e[N];

void pre_dfs(int u){
    s[u] = 1;
    for(auto [v, w] : e[u]){
        if(v == p[u]) continue;

        p[v] = u;
        h[v] = h[u] + 1;
        pre_dfs(v);
        s[u] += s[v];
        if(s[v] > s[nxt[u]]) nxt[u] = v;
    }
}

void hld(int u, int p){
    if(!key[stt]) key[stt] = u;
    chain[u] = stt;
    in[u] = ++TIME;

    int c = nxt[u];
    if(c) hld(c, u);

    for(auto [v, w] : e[u]){
        if(v != p && v != c){
            ++stt;
            hld(v, u);
        }
    }
}

pi Merge(pi a, pi b){
    return {min(a.F, b.F), max(a.S, b.S)};
}

void down(int id){
    if(rs[id]){
        st[2 * id].F = st[2 * id + 1].F = 0;
        st[2 * id].S = st[2 * id + 1].S = 0;
        lz[2 * id] = lz[2 * id + 1] = 0;

        rs[2 * id] = rs[2 * id + 1] = 1;
        rs[id] = 0;
    }

    if(lz[id]){
        st[2 * id].F = st[2 * id + 1].F = lz[id];
        st[2 * id].S = st[2 * id + 1].S = lz[id];
        lz[2 * id] = lz[2 * id + 1] = lz[id];
        lz[id] = 0;
    }
}

void update(int id, int l, int r, int u, int v, int x){
    if(l > v || r < u) return;
    if(u <= l && r <= v){
        st[id].F = st[id].S = x;
        lz[id] = x;
        return;
    }
    down(id);
    int m = (l + r) / 2;
    update(2 * id, l, m, u, v, x);
    update(2 * id + 1, m + 1, r, u, v, x);

    st[id] = Merge(st[2 * id], st[2 * id + 1]);
}

pi get(int id, int l, int r, int u, int v){
    if(l > v || r < u) return {oo, -oo};
    if(u <= l && r <= v){
        return st[id];
    }
    down(id);
    int m = (l + r) / 2;
    return Merge(get(2 * id, l, m, u, v), get(2 * id + 1, m + 1, r, u, v));
}

void up(int u, int v, int x){
    while(chain[u] != chain[v]){
        if(chain[u] < chain[v]) swap(u, v);
        update(1, 1, n, in[key[chain[u]]], in[u], x);
        u = p[key[chain[u]]];
    }
    if(h[u] < h[v]) swap(u, v);
    update(1, 1, n, in[v], in[u], x);
}

int check(int u, int v){
    pi res = {oo, -oo};
    while(chain[u] != chain[v]){
        if(chain[u] < chain[v]) swap(u, v);
        res = Merge(res, get(1, 1, n, in[key[chain[u]]], in[u]));
        u = p[key[chain[u]]];
    }
    if(h[u] < h[v]) swap(u, v);
    res = Merge(res, get(1, 1, n, in[v], in[u]));
    return (res.F == res.S);
}

int dis(int u, int v){
    int uu = u, vv = v;
    while(chain[u] != chain[v]){
        if(chain[u] < chain[v]) swap(u, v);
        u = p[key[chain[u]]];
    }
    if(h[u] < h[v]) swap(u, v);
    return (h[uu] + h[vv] - 2 * h[v]);
}

bool cmp(pii a, pii b){
    return a.F > b.F;
}

void solve(){
    cin >> n;
    FOR(i, 2, n){
        int u, v; cin >> u >> v;
        e[u].pb({v, 0});
        e[v].pb({u, 0});
    }
    pre_dfs(1);
    hld(1, 0);
    int t; cin >> t;
    while(t--){
        cin >> q;
        FOR(i, 1, q){
            cin >> Q[i].S.F >> Q[i].S.S;
            Q[i].F = dis(Q[i].S.F, Q[i].S.S);
        }
        sort(Q + 1, Q + 1 + q, cmp);
        int res = 1;

        FOR(i, 1, q){
            int u = Q[i].S.F, v = Q[i].S.S;
            res &= check(u, v);
            if(res == 0) break;
            up(u, v, i);
        }
//        cout << res << "\n";
        cout << (res ? "RO RANG\n" : "MAP MO\n");
        st[1].F = st[1].S = lz[1] = 0;
        rs[1] = 1;
    }
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    inp("in.txt");
//    out("ans.txt");
    int t = 1;
    cin >> t;
//    while(t--){
        solve();
//    }
}

Compilation message (stderr)

diameter.cpp: In function 'int main()':
diameter.cpp:17:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 | #define inp(name) if(fopen(name, "r")) freopen(name, "r", stdin);
      |                                        ~~~~~~~^~~~~~~~~~~~~~~~~~
diameter.cpp:175:5: note: in expansion of macro 'inp'
  175 |     inp("in.txt");
      |     ^~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 13
• Subtask 3: 0 / 7
• Subtask 4: 0 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 27