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답안 #73835

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
73835 2018-08-29T06:15:58 Z 노영훈(#2275) 통행료 (APIO13_toll) C++11
0 / 100
 4 ms 756 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int VMX=1010, EMX=5010;

int n, m, k, A[VMX];
vector<pii> G[VMX];
struct edge {
	int u,v,c; bool greed=false;
	void scan(){ cin>>u>>v>>c; }
	bool operator < (const edge &e) const {
		return c<e.c || (c==e.c || greed>e.greed);
	}
} E[EMX], F[32];

int U[VMX];
int find(int x){ return x==U[x] ? x : U[x]=find(U[x]); }
void unite(int x, int y){ U[find(y)]=find(x); }

ll krusk(vector<edge> &W){
	ll sum=0;
	for(int i=1; i<=n; i++) G[i].clear(), U[i]=i;
	sort(W.begin(), W.end());
	for(edge &e:W){
		int u=e.u, v=e.v, c=e.c;
		if(find(u)==find(v)) continue;
		unite(u,v); sum+=c;
		if(e.greed) c=-c;
		G[u].push_back({v,c});
		G[v].push_back({u,c});
	}
	return sum;
}

pii par[VMX]; int dep[VMX];

void dfs1(int v=1, int p=-1, int d=0){
	dep[v]=d;
	for(pii e:G[v]){
		int x,c; tie(x,c)=e; c=abs(c);
		if(x==p) continue;
		par[x]={v,c};
		dfs1(x,v,d+1);
	}
}

int lca_mx(int u, int v){
	int res=0;
	if(dep[u]<dep[v]) swap(u,v);
	while(dep[u]>dep[v]) res=max(res, par[u].second), u=par[u].first;
	while(u!=v){
		res=max({res, par[u].second, par[v].second});
		u=par[u].first, v=par[v].first;
	}
	return res;
}

ll sub[VMX];

ll dfs2(int v=1, int p=-1){
	ll res=0; sub[v]=A[v];
	for(pii e:G[v]){
		int x,c; tie(x,c)=e;
		if(x==p) continue;
		res+=dfs2(x,v), sub[v]+=sub[x];
		if(c<0) res+=abs(c)*sub[x];
	}
	return res;
}

ll check(int s){
	vector<edge> W;
	for(int i=1; i<=m; i++) W.push_back(E[i]);
	for(int i=0; i<k; i++)
		if(s&(1<<i)) W.push_back(F[i+1]);
	krusk(W);
	return dfs2();
}

void solve(){
	vector<edge> W;
	for(int i=1; i<=m; i++) W.push_back(E[i]);
	krusk(W);
	par[1]={-1,-1}; dfs1();

	for(int i=1; i<=k; i++){
		F[i].c = lca_mx(F[i].u, F[i].v);
	}

	ll ans=0;
	for(int i=0; i<(1<<k); i++){
		ans=max(ans, check(i));
	}
	cout<<ans<<'\n';
}

int main(){
	ios::sync_with_stdio(0); cin.tie(0);
	cin>>n>>m>>k;
	for(int i=1; i<=m; i++) E[i].scan();
	for(int i=1; i<=k; i++) cin>>F[i].u>>F[i].v, F[i].greed=true;
	for(int i=1; i<=n; i++) cin>>A[i];

	solve();

	return 0;
}

Subtask #1
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 4 ms 756 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 4 ms 756 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 4 ms 756 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 4 ms 756 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 4 ms 756 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -