Submission #427655

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
427655	2021-06-14T18:25:15 Z	shubham20_03	Traffic (IOI10_traffic)	C++17	Compilation error	0 ms	0 KB

traffic

#include <bits/stdc++.h>
#include "traffic.h"
#define FAST ios_base::sync_with_stdio(false); cin.tie(NULL)
#define int long long

vector<int> adj[1000000];
int tot_peo[1000000], ans[1000000], peo[1000000];

// refer kartik arora's dp on trees youtube videos
// idea is taken from his tree distance ii video

void dfs1(int u, int p = -1) {
	tot_peo[u] = peo[u];
	for (int v : adj[u])
		if (v != p) {
			dfs1(v, u);
			tot_peo[u] += tot_peo[v];
		}
}

void dfs2(int u, int p = -1) {
	ans[u] = 0;
	for (int v : adj[u])
		if (v != p)
			ans[u] = max(ans[u], tot_peo[v]);

	if (p != -1)
		ans[u] = max(ans[u], tot_peo[0] - tot_peo[u]);

	for (int v : adj[u])
		if (v != p)
			dfs2(v, u);
}

int LocateCentre(int N, int P[], int S[], int D[]) {
	for (int i = 0; i < N - 1; i++) {
		adj[S[i]].push_back(D[i]);
		adj[D[i]].push_back(S[i]);
	}

	for (int i = 0; i < N; i++)
		peo[i] = P[i];

	dfs1(0);
	dfs2(0);

	int mn = 1e18;
	for (int i = 0; i < N; i++)
		mn = min(mn, ans[i]);

	return mn;
}

Compilation message

traffic.cpp:6:1: error: 'vector' does not name a type
    6 | vector<int> adj[1000000];
      | ^~~~~~
traffic.cpp: In function 'void dfs1(long long int, long long int)':
traffic.cpp:14:15: error: 'adj' was not declared in this scope
   14 |  for (int v : adj[u])
      |               ^~~
traffic.cpp: In function 'void dfs2(long long int, long long int)':
traffic.cpp:23:15: error: 'adj' was not declared in this scope
   23 |  for (int v : adj[u])
      |               ^~~
traffic.cpp:25:13: error: 'max' was not declared in this scope; did you mean 'std::max'?
   25 |    ans[u] = max(ans[u], tot_peo[v]);
      |             ^~~
      |             std::max
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from traffic.cpp:1:
/usr/include/c++/10/bits/stl_algo.h:3486:5: note: 'std::max' declared here
 3486 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
traffic.cpp:28:12: error: 'max' was not declared in this scope; did you mean 'std::max'?
   28 |   ans[u] = max(ans[u], tot_peo[0] - tot_peo[u]);
      |            ^~~
      |            std::max
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from traffic.cpp:1:
/usr/include/c++/10/bits/stl_algo.h:3486:5: note: 'std::max' declared here
 3486 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
traffic.cpp:30:15: error: 'adj' was not declared in this scope
   30 |  for (int v : adj[u])
      |               ^~~
traffic.cpp: In function 'long long int LocateCentre(long long int, long long int*, long long int*, long long int*)':
traffic.cpp:37:3: error: 'adj' was not declared in this scope
   37 |   adj[S[i]].push_back(D[i]);
      |   ^~~
traffic.cpp:49:8: error: 'min' was not declared in this scope; did you mean 'std::min'?
   49 |   mn = min(mn, ans[i]);
      |        ^~~
      |        std::min
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from traffic.cpp:1:
/usr/include/c++/10/bits/stl_algo.h:3474:5: note: 'std::min' declared here
 3474 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~