Submission #592974

#	Time	Username	Problem	Language	Result	Execution time	Memory
592974		1zaid1	Stranded Far From Home (BOI22_island)	C++17	20 / 100	282 ms	62392 KiB

island

#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
const int M = 4e5+1;
#define int long long
vector<int> node[M], v[M];
bitset<200005> vis;
int p[M], n, cnt[M];

struct in{int a;};
bool operator<(in a, in b) {return p[a.a] > p[b.a];}
bool bfs(int s) {
    for (int i = 1; i <= n; i++) vis[i] = 0;
    int sum = 0;
    priority_queue<in> q;
    vis[s] = 1;
    q.push({s});
    while (!q.empty()) {
        auto [t] = q.top(); q.pop();
        if (t != s && p[t] > sum) {
            return 0;
        } else sum += p[t];
        for (int i:node[t]) {
            if (!vis[i]) {
                vis[i] = 1;
                q.push({i});
            }
        }
    }
 
    return true;
}

void dfs(int s) {
    cnt[s] = p[s];
    vis[s] = true;
    v[s].push_back(s);
    for (int i:node[s]) {
        if (!vis[i]) {
            dfs(i);
            if (cnt[i] >= p[s]) {
                if (v[i].size() > v[s].size()) swap(v[s], v[i]);
                for (int j:v[i]) v[s].push_back(j);
            }

            cnt[s] += cnt[i];
        }
    }
}
 
signed main() {
    cin.tie(0)->sync_with_stdio(0);
 
    int m;
    cin >> n >> m;
 
    for (int i = 1; i <= n; i++) cin >> p[i];
    for (int i = 1; i <= m; i++) {
        int a, b;
        cin >> a >> b;
 
        node[a].push_back(b);
        node[b].push_back(a);
    }
 
    if (n <= 2000) {
        for (int i = 1; i <= n; i++) sort(node[i].begin(), node[i].end(),[](int a, int b) {return p[a] < p[b];});
        for (int i = 1; i <= n; i++) cout << bfs(i); cout << endl;
    } else {
        dfs(1);
        bitset<200005> bt;
        for (int i:v[1]) bt[i] = 1;
        for (int i = 1; i <= n; i++) cout << bt[i]; cout << endl;
    }
 
    return 0;
}
/*
4 3
4 2 2 1
1 2
3 2
4 1
*/

Compilation message (stderr)

island.cpp: In function 'int main()':
island.cpp:68:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   68 |         for (int i = 1; i <= n; i++) cout << bfs(i); cout << endl;
      |         ^~~
island.cpp:68:54: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   68 |         for (int i = 1; i <= n; i++) cout << bfs(i); cout << endl;
      |                                                      ^~~~
island.cpp:73:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   73 |         for (int i = 1; i <= n; i++) cout << bt[i]; cout << endl;
      |         ^~~
island.cpp:73:53: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   73 |         for (int i = 1; i <= n; i++) cout << bt[i]; cout << endl;
      |                                                     ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35