Submission #578123

#	Time	Username	Problem	Language	Result	Execution time	Memory
578123		8e7	Stranded Far From Home (BOI22_island)	C++17	0 / 100	718 ms	109140 KiB

island

//Challenge: Accepted
#include <bits/stdc++.h>
using namespace std;
#ifdef zisk
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ... b){cout << a << " ", debug(b...); }
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
}
#else
#define debug(...) 0
#define pary(...) 0
#endif
#define ll long long
#define maxn 200005
#define maxc 31
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
const ll inf = 1LL<<60;
vector<int> adj[maxn];
ll sum[maxc][maxn], mi[maxc][maxn], comp[maxc][maxn];
ll w[maxn];
int lev[maxn];

bool vis[maxn], tv[maxn];
void dfs(int n, int id, int l) {
	vis[n] = 1;	
	sum[l][id] += w[n];
	comp[l][n] = id;
	for (int v:adj[n]) {
		if (!vis[v] && lev[v] < l) dfs(v, id, l);
	}
}
int main() {
	io
	int n, m;
	cin >> n >> m;
	ll tot = 0;
	for (int i = 1;i <= n;i++) cin >> w[i], tot += w[i];
	for (int i = 0;i < m;i++) {
		int u, v;
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	for (int i = 1;i <= n;i++) {
		ll tmp = w[i];
		while (tmp >= 2) {
			lev[i]++;
			tmp >>= 1;
		}
	}
	for (int j = 0;j <= n;j++) mi[0][j] = inf;
	for (int i = 1;i < maxc;i++) {
		for (int j = 1;j <= n;j++) vis[j] = 0, mi[i][j] = inf;
		mi[i][0] = inf;
		int c = 1;
		for (int j = 1;j <= n;j++) {
			if (!vis[j] && lev[j] < i) {
				dfs(j, c, i);
				debug(i, j, c, sum[i][c]);
				c++;
			}
		}
		for (int j = 1;j <= n;j++) {
			if (lev[j] >= i) {
				for (int k:adj[j]) {
					mi[i][comp[i][k]] = min(mi[i][comp[i][k]], w[j]);
				}
			}
		}
	}
	string ans;
	for (int i = 1;i <= n;i++) {
		int cur = lev[i];
		bool poss = 0, fi = 1;
		while (cur < maxc) {
			ll p = 0, val = inf;
			if (fi) {
				fi = 0;
				p = w[i];
				vector<int> v;
				for (int j:adj[i]) {
					if (lev[j] < cur && !tv[comp[cur][j]]) {
						int c = comp[cur][j];
						tv[c] = 1;
						p += sum[cur][c];
						v.push_back(c);
						val = min(val, mi[cur][c]);
					} else if (lev[j] >= cur) {
						val = min(val, w[j]);
					}
				}
				for (int j:v) tv[j] = 0;
			} else {
				val = min(val, mi[cur][comp[cur][i]]);
			}
			p += sum[cur][comp[cur][i]];
			debug(cur, p, val);
			if (p == tot) {
				poss = 1;
				break;
			} else if (p < val) {
				break;
			} else {
				cur++;
			}
		}
		debug();
		if (poss) ans += '1';
		else ans += '0';
	}
	cout << ans << "\n";
}
/*

6 7 
8 5 4 4 6 20
1 2
1 3
1 4
2 3
2 4
1 5
5 6
*/

Compilation message (stderr)

island.cpp: In function 'int main()':
island.cpp:12:20: warning: statement has no effect [-Wunused-value]
   12 | #define debug(...) 0
      |                    ^
island.cpp:64:5: note: in expansion of macro 'debug'
   64 |     debug(i, j, c, sum[i][c]);
      |     ^~~~~
island.cpp:12:20: warning: statement has no effect [-Wunused-value]
   12 | #define debug(...) 0
      |                    ^
island.cpp:102:4: note: in expansion of macro 'debug'
  102 |    debug(cur, p, val);
      |    ^~~~~
island.cpp:12:20: warning: statement has no effect [-Wunused-value]
   12 | #define debug(...) 0
      |                    ^
island.cpp:112:3: note: in expansion of macro 'debug'
  112 |   debug();
      |   ^~~~~

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