Submission #1278152

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278152		phuocrucpp	Tourism (JOI23_tourism)	C++20	28 / 100	5092 ms	26556 KiB

tourism

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#include<bits/stdc++.h>
#define task "main"
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
#define int long long
#define pb push_back
#define fi first
#define se second
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii, ii>
#define base 341
#define MASK(i) (1ll << i)
#define oo 1e18
#define isOn(x,i) ((x) & MASK(i))
#define bitOn(x,i) ((x) | MASK(i))
#define bitOff(x,i) ((x) & ~MASK(i))
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define __lcm(a,b) (1ll * ((a) / __gcd((a), (b))) * (b))
using namespace std;
//using namespace __gnu_pbds;
const int maxn = 1e5 + 5;
const int lg = 18;

int n, m, test, tin[maxn], timer, c[maxn], h[maxn], par[maxn][lg + 2];
vector <int> g[maxn];

void dfs(int u, int p) {
    tin[u] = ++timer;
	for (int x : g[u]) {
		if (x == p) continue;
		h[x] = h[u] + 1;
		par[x][0] = u;
		dfs(x, u);
	}
}
int lca(int u, int v) {
	if (h[u] < h[v]) swap(u,v);
	for (int i = lg; i >= 0; i--) {
		if ((h[u] - h[v]) >= MASK(i)) u = par[u][i];
	}
	if (u == v) return u;
	for (int i = lg; i >= 0; i--) {
		if (par[u][i] != par[v][i]) {
			u = par[u][i];
			v = par[v][i];
		}
	}
	return par[u][0];
}
void prelca() {
	dfs(1, -1);
	for (int j = 1; j <= lg; j++) {
		for (int i = 1; i <= n; i++) {
			par[i][j] = par[par[i][j-1]][j-1];
		}
	}
}

int dist(int l, int r) {
    return h[l] + h[r] - 2 * h[lca(l, r)];
}

main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if(fopen(task".inp","r")) {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin >> n >> m >> test;
    for (int i = 1; i < n; i++) {
        int l, r;
        cin >> l >> r;
        g[l].pb(r); g[r].pb(l);
    }

    prelca();
    for (int i = 1; i <= m; i++) cin >> c[i];

    while(test--) {
        int l, r;
        cin >> l >> r;

        vector <ii> v;
        for (int i = l; i <= r; i++) {
            v.pb({tin[c[i]], c[i]});
        }
        sort(v.begin(), v.end());

        int sum = 0;
        for (int i = 0; i < v.size(); i++) {
            sum += dist(v[i].se, v[(i + 1) % v.size()].se);
        }
        cout << sum / 2 + 1 << endl;
    }
}

Compilation message (stderr)

tourism.cpp:79:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   79 | main() {
      | ^~~~
tourism.cpp: In function 'int main()':
tourism.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
tourism.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 7
• Subtask 4: 18 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 41