Submission #957803

#	Time	Username	Problem	Language	Result	Execution time	Memory
957803		Trisanu_Das	Race (IOI11_race)	C++17	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define pb push_back
#define ff first
#define sf second

vector<pair<ll, ll> > adj[200005];
map<ll, ll> sum_to_dist[200005];
ll dist[maxn], sum[maxn];
int N, K;
ll ans;

void dfs(int u, int p, ll s, int d) {
	sum_to_dist[u][s] = d;
	sum[u] = s;
	dist[u] = d;
	for (auto v : adj[u]) if (p != v.ff) dfs(v.ff, u, s + v.ss, d + 1);
}

void merge_dfs(int u, int p) {
	ll target = K + 2 * sum[u];
	for (auto v : adj[u]) {
		if (v.ff == p) continue;
		merge_dfs(v.ff, u);
		if (sum_to_dist[v.ff].size() > sum_to_dist[u].size()) swap(sum_to_dist[v.ff], sum_to_dist[u]);
		for (auto p : sum_to_dist[v.ff]) {
			if (sum_to_dist[u].find(target - p.ff) != sum_to_dist[u].end()) {
				ans = min(ans, sum_to_dist[u][target - p.ff] + p.ss - 2 * dist[u]);
		for (auto p : sum_to_dist[v.ff]) {
			if (sum_to_dist[u].find(p.ff) == sum_to_dist[u].end()) sum_to_dist[u].insert(p);
			else info[u][p.ff] = min(sum_to_dist[u][p.ff], p.ss);
		}
	}
}

int best_path(int n, int k, int h[][2], int l[]) {
	if (k == 1) return 0;
	N = n; K = k; ans = INT_MAX;
	for (int i = 0; i < n - 1; i++) {
		int u = h[i][0], v = h[i][1];
		adj[u].pb(pii(v, l[i]));
		adj[v].pb(pii(u, l[i]));
	}
	dfs(0, -1, 0, 0);
	merge_dfs(0, -1);
	return ans == INT_MAX ? -1 : ans;
}

Compilation message (stderr)

race.cpp:10:9: error: 'maxn' was not declared in this scope
   10 | ll dist[maxn], sum[maxn];
      |         ^~~~
race.cpp:10:20: error: 'maxn' was not declared in this scope
   10 | ll dist[maxn], sum[maxn];
      |                    ^~~~
race.cpp: In function 'void dfs(int, int, ll, int)':
race.cpp:16:2: error: 'sum' was not declared in this scope
   16 |  sum[u] = s;
      |  ^~~
race.cpp:17:2: error: 'dist' was not declared in this scope
   17 |  dist[u] = d;
      |  ^~~~
race.cpp:18:58: error: 'struct std::pair<long long int, long long int>' has no member named 'ss'
   18 |  for (auto v : adj[u]) if (p != v.ff) dfs(v.ff, u, s + v.ss, d + 1);
      |                                                          ^~
race.cpp: In function 'void merge_dfs(int, int)':
race.cpp:22:22: error: 'sum' was not declared in this scope
   22 |  ll target = K + 2 * sum[u];
      |                      ^~~
race.cpp:29:54: error: 'struct std::pair<const long long int, long long int>' has no member named 'ss'
   29 |     ans = min(ans, sum_to_dist[u][target - p.ff] + p.ss - 2 * dist[u]);
      |                                                      ^~
race.cpp:29:63: error: 'dist' was not declared in this scope
   29 |     ans = min(ans, sum_to_dist[u][target - p.ff] + p.ss - 2 * dist[u]);
      |                                                               ^~~~
race.cpp:32:9: error: 'info' was not declared in this scope
   32 |    else info[u][p.ff] = min(sum_to_dist[u][p.ff], p.ss);
      |         ^~~~
race.cpp:32:53: error: 'struct std::pair<const long long int, long long int>' has no member named 'ss'
   32 |    else info[u][p.ff] = min(sum_to_dist[u][p.ff], p.ss);
      |                                                     ^~
race.cpp:37:50: error: a function-definition is not allowed here before '{' token
   37 | int best_path(int n, int k, int h[][2], int l[]) {
      |                                                  ^
race.cpp:48:1: error: expected '}' at end of input
   48 | }
      | ^
race.cpp:23:24: note: to match this '{'
   23 |  for (auto v : adj[u]) {
      |                        ^
race.cpp:48:1: error: expected '}' at end of input
   48 | }
      | ^
race.cpp:21:30: note: to match this '{'
   21 | void merge_dfs(int u, int p) {
      |                              ^