Submission #405729

#	Time	Username	Problem	Language	Result	Execution time	Memory
405729		knightron0	Factories (JOI14_factories)	C++14	0 / 100	39 ms	33732 KiB

factories

#include "factories.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define fr first
#define sc second
#define clr(a, x) memset(a, x, sizeof(a))
#define dbg(x) cout<<"("<<#x<<"): "<<x<<endl;
#define printvector(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout<<*it<<" "; cout<<endl;
#define all(v) v.begin(), v.end()
#define lcm(a, b) (a * b)/__gcd(a, b)
#define printvecpairs(vec) for(auto it: vec) cout<<it.fr<<' '<<it.sc<<endl;
#define endl '\n'
#define ll long long int
#define float long double

const int MOD = 1e9 + 7;
const ll INF = 2e15;
const int MAXN = 5e5 + 5;
const int LOGN = 23;

vector<array<ll, 2>> adj[MAXN];
ll par[MAXN], sz[MAXN], depth[MAXN], dist[LOGN][MAXN], ans[MAXN], nm;
bool rm[MAXN];

int dfs(int u, int p){
	sz[u] = 1;
	for(auto &[v, w]: adj[u]){
		if(v != p && !rm[v]){
			sz[u] += dfs(v, u);
		}
	}
	return sz[u];
}

int dfs2(int u, int p, int l){
	for(auto &[v, w]: adj[u]){
		if(v != p && !rm[v]){
			dist[l][v] = dist[l][u] + w;
			dfs2(v, u, l);
		}
	}
}

int centroid(int u, int p, int n){
	for(auto &[v, w]: adj[u]){
		if(v != p && !rm[v]){
			if(sz[v]*2 > n){
				return centroid(v, u, n);
			}
		}
	}
	return u;
}

void decompose(int u, int p, int d){
	int n = dfs(u, p);
	int c = centroid(u, p, n);
	par[c] = p;
	depth[c] = d;
	dist[d][c] = 0;
	dfs2(c, -1, d);
	rm[c] = 1;
	for(auto &[v, w]: adj[c]){
		if(!rm[v]){
			decompose(v, c, d+1);
		}		
	}
}

void update(int v, int s){
	ans[v] = min(ans[v], dist[depth[v]][s]);
	if(depth[v] != 0){
		update(par[v], s);
	}
}

ll qry(int v, int s){
	if(depth[v] != 0){
		return min(ans[v]+dist[depth[v]][s], qry(par[v], s));
	} else {
		return ans[v] + dist[depth[v]][s];
	}
}

void Init(int N, int A[], int B[], int D[]) {
	nm = N;
	clr(rm, 0);
	clr(sz, 1);
	for(int i= 0;i<nm-1;i++){
		A[i]++; B[i]++;
		adj[A[i]].pb({B[i], D[i]});
		adj[B[i]].pb({A[i], D[i]});
	}
	decompose(1, 0, 0);
	for(int i=0;i<=nm;i++) ans[i]= INF;
}

ll Query(int S, int X[], int T, int Y[]){
	for(int i=0;i<S;i++){
		X[i]++;
		update(X[i], X[i]);
	}
	ll res = INF;
	for(int i = 0;i<T;i++){
		Y[i]++;
		res = min(res, qry(Y[i], Y[i]));
	}
	for(int i=0;i<=nm;i++) ans[i]= INF;
	return res;
}

Compilation message (stderr)

factories.cpp: In function 'int dfs(int, int)':
factories.cpp:29:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   29 |  for(auto &[v, w]: adj[u]){
      |            ^
factories.cpp: In function 'int dfs2(int, int, int)':
factories.cpp:38:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   38 |  for(auto &[v, w]: adj[u]){
      |            ^
factories.cpp:44:1: warning: no return statement in function returning non-void [-Wreturn-type]
   44 | }
      | ^
factories.cpp: In function 'int centroid(int, int, int)':
factories.cpp:47:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |  for(auto &[v, w]: adj[u]){
      |            ^
factories.cpp: In function 'void decompose(int, int, int)':
factories.cpp:65:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   65 |  for(auto &[v, w]: adj[c]){
      |            ^

• Subtask 1: 0 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67