Submission #765365

#	Time	Username	Problem	Language	Result	Execution time	Memory
765365		vjudge1	Roadside Advertisements (NOI17_roadsideadverts)	C++17	100 / 100	64 ms	16808 KiB

roadsideadverts

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#pragma GCC optimization("g", on)
#pragma GCC optimization("03")
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse,-fgcse-lm")
#pragma GCC optimize("-ftree-pre,-ftree-vrp")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("Ofast,no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")

#define boba ios_base::sync_with_stdio(false); cin.tie(NULL);
#define br break
#define sp " "
#define en "\n"
#define pb push_back
#define sz size()
#define bg begin()
#define ed end()
#define in insert
#define ss second
#define ff first
#define rbg rbegin()
#define setp(a) cout << fixed; cout << setprecision(a);
#define all(v) v.begin(), v.end()
#define emp empty()
 
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef double db;
typedef tree<
    long long,
    null_type,
    less_equal<long long>,
    rb_tree_tag,
    tree_order_statistics_node_update> orset;

void freopen(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); }
ll bp(ll x, ll y, ll z) { ll res = 1; while (y) { if (y & 1) { res = (res * x) % z; y--; } x = (x * x) % z; y >>= 1; } return res; }
// C(n, k) = ((fact[n] * bp(fact[k], mod - 2)) % mod * bp(fact[n - k], mod - 2)) % mod;
ll lcm(ll a, ll b) { return (a / __gcd(a, b)) * b; }

const ll N = 5e4 + 11;	
const ll inf = 1e9 + 7;
ll tt = 1;
vector<pll> g[N];
ll d[N], pr[N];
ll up[N][17];
ll tin[N];
ll timer;

void dfs(ll v, ll p) {
	tin[v] = ++timer;
	up[v][0] = p;
	for (int i = 1;i <= 16;i++) up[v][i] = up[up[v][i - 1]][i - 1];
	for (auto to : g[v]) {
		if (to.ff != p) {
			d[to.ff] = d[v] + 1;
			pr[to.ff] = pr[v] + to.ss;
//			cout << d[to.ff] << sp << pr[d[to.ff]] << sp << to.ff << sp << v << en;
			dfs(to.ff, v);
		}
	}
}

ll lca(ll x, ll y) {
//	cout << x << sp << y << en;
	if (d[x] < d[y]) swap(x, y);
	ll k = d[x] - d[y];
	for (int i = 0;i < 17;i++) {
		if (k & (1 << i)) {
			x = up[x][i];
		}
	}
	if (x == y) return x;
	for (int i = 16;i >= 0;i--) {
		if (up[x][i] != up[y][i]) {
			x = up[x][i];
			y = up[y][i];
		}
	}
	return up[x][0];
}
	
void solve() {
	ll n; cin >> n;
	for (int i = 1;i < n;i++) {
		ll u, v, w; cin >> u >> v >> w;
		u++, v++;
		g[u].pb({v, w});
		g[v].pb({u, w});
	}
	ll rt = 0;
	dfs(1, 0);
	ll q; cin >> q;
	while (q--) {
		ll b[6], ans[6]; 
		ll lc = 0;
		vector<pll> c;
		c.clear();
		bool u[6];
		for (int i = 1;i <= 5;i++) {
			u[i] = 0;
			ans[i] = 0;
			cin >> b[i];
			b[i]++;
			c.pb({tin[b[i]], b[i]});
		}
		sort(c.bg, c.ed);
		ll sum = 0;
		for (int i = 0;i < 5;i++) {
			ll h = lca(c[i].ss, c[(i + 1) % 5].ss);
			sum += (pr[c[i].ss] - pr[h]) + (pr[c[(i + 1) % 5].ss] - pr[h]);
		}
		cout << sum / 2 << en;
	}
}	
  
int main() {    
   boba                                   
//    freopen("ladder");
//    precalc();
//    cin >> tt;	
	for (int i = 1;i <= tt;i++) {
		solve(); 
    }
}

Compilation message (stderr)

roadsideadverts.cpp:7: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    7 | #pragma GCC optimization("g", on)
      | 
roadsideadverts.cpp:8: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    8 | #pragma GCC optimization("03")
      | 
roadsideadverts.cpp:9: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    9 | #pragma comment(linker, "/stack:200000000")
      | 
roadsideadverts.cpp: In function 'void solve()':
roadsideadverts.cpp:108:12: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
  108 |   ll b[6], ans[6];
      |            ^~~
roadsideadverts.cpp:109:6: warning: unused variable 'lc' [-Wunused-variable]
  109 |   ll lc = 0;
      |      ^~
roadsideadverts.cpp:112:8: warning: variable 'u' set but not used [-Wunused-but-set-variable]
  112 |   bool u[6];
      |        ^
roadsideadverts.cpp:104:5: warning: unused variable 'rt' [-Wunused-variable]
  104 |  ll rt = 0;
      |     ^~
roadsideadverts.cpp: In function 'void freopen(std::string)':
roadsideadverts.cpp:49:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 | void freopen(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); }
      |                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
roadsideadverts.cpp:49:75: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 | void freopen(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); }
      |                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 40 / 40
• Subtask 4: 30 / 30