Submission #205699

#	Time	Username	Problem	Language	Result	Execution time	Memory
205699		ZwariowanyMarcin	Sightseeing (NOI14_sightseeing)	C++14	25 / 25	3293 ms	216584 KiB

sightseeing

#include <bits/stdc++.h>
#define LL long long
#define LD long double
#define pb push_back
#define mp make_pair
#define ss(x) (int) x.size()
#define fi first
#define se second
#define cat(x) cerr << #x << " = " << x << endl
#define rep2(i, j, n) for (LL i = j; i <= n; ++i)
#define rep(i, j, n) for (int i = j; i <= n; ++i)
#define per(i, j, n) for (int i = n; j <= i; --i)
#define boost cin.tie(0);ios_base::sync_with_stdio(0);
#define vi vector <int>

using namespace std;

const int nax = 5e6 + 111;

int n, m, q;
int a, b, c;

vector <pair<int, pair<int, int>>> ed;

int ans[nax];

int p[nax];
vector <pair<int, int>> v[nax];

int find(int x) {
	if (x == p[x]) return x;
	return p[x] = find(p[x]);
}

void unia(int x, int y) {
	x = find(x);
	y = find(y);
	if (ss(v[x]) > ss(v[y])) swap(x, y);
	p[x] = y;
	for (auto it : v[x])
		v[y].pb(it);
}
	

int main() {	
	scanf ("%d%d%d", &n, &m, &q);
	rep(i, 1, m) {
		scanf ("%d%d%d", &a, &b, &c);
		ed.pb({c, {a, b}});
	}
	
	sort(ed.begin(), ed.end());
	rep(i, 1, q) {
		scanf ("%d", &a);
		v[a].pb({a, i});
	}
	rep(i, 1, n) p[i] = i;
	
	per(i, 0, ss(ed) - 1) {
		int cost = ed[i].fi;
		int x = ed[i].se.fi;
		int y = ed[i].se.se;	
		x = find(x);
		y = find(y);
		
		if (x == y) continue;
		if (find(1) != x) swap(x, y);
		if (find(1) == x) {
			p[y] = x;
			for (auto it : v[y])
				ans[it.se] = cost;
			continue;
		}
		unia(x, y);
	}
	
	rep(i, 1, q) printf ("%d\n", ans[i]);
		
	
	return 0;
}

Compilation message (stderr)

sightseeing.cpp: In function 'int main()':
sightseeing.cpp:46:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%d%d", &n, &m, &q);
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:48:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d%d%d", &a, &b, &c);
   ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:54:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d", &a);
   ~~~~~~^~~~~~~~~~

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