This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
vector<vector<int>> w;
vector<ll> vals;
vector<int> r, p;
int find(int a) { return a == p[a] ? a : p[a] = find(p[a]); }
void link(int a, int b) {
a = find(a), b = find(b);
if (a == b) return;
if (r[a] < r[b]) swap(a, b);
if (r[a] == r[b]) ++r[a];
p[b] = a;
}
int main() {
int n, m; cin >> n >> m;
vector<int> arr(n); for (int i = 0; i < n; ++i) cin >> arr[i];
set<int> nums; for (int num : arr) nums.insert(num);
vector<int> copy(nums.begin(), nums.end());
vector<vector<pii>> edges(copy.size());
for (int i = 0; i < m; ++i) {
int a, b; cin >> a >> b; --a, --b;
edges[lower_bound(copy.begin(), copy.end(), max(arr[a], arr[b])) - copy.begin()].push_back({a, b});
}
w.resize(n), vals.resize(n), r.resize(n), p.resize(n);
for (int i = 0; i < n; ++i) w[i].push_back(i), vals[i] = arr[i], p[i] = i;
for (int i = 0; i < copy.size(); ++i) {
for (pii edge : edges[i]) {
int a = edge.first, b = edge.second;
int pa = find(a), pb = find(b);
if (pa == pb) continue;
link(a, b);
int np = find(a);
if (vals[pa] < arr[b]) swap(w[np], w[pb]);
else if (vals[pb] < arr[a]) swap(w[np], w[pa]);
else {
if (w[pa].size() < w[pb].size()) swap(w[pa], w[pb]);
for (int v : w[pb]) w[pa].push_back(v);
swap(w[np], w[pa]);
}
vals[np] = vals[pa] + vals[pb];
}
}
vector<bool> ans(n);
for (int v : w[find(0)]) ans[v] = true;
for (int num : ans) cout << num;
cout << '\n';
return 0;
}
Compilation message (stderr)
island.cpp: In function 'int main()':
island.cpp:33:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
33 | for (int i = 0; i < copy.size(); ++i) {
| ~~^~~~~~~~~~~~~
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