#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,avx2")
#pragma GCC optimize("unroll-loops,O2")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 2e5+10,mod = 998244353,inf = 1e9+10;
inline int mkay(int a,int b){
if (a+b >= mod) return a+b-mod;
if (a+b < 0) return a+b+mod;
return a+b;
}
inline int poww(int a,int k){
if (k < 0) return 0;
int z = 1;
while (k){
if (k&1) z = 1ll*z*a%mod;
a = 1ll*a*a%mod;
k /= 2;
}
return z;
}
int par[N][20],h[N],r,U,V,sz[N],tin[N],T,lc;
ll opt[N],d[N][2],up[N],sum,lz[N*4];
pair<ll,int> mx[N],seg[N*4];
vector<int> ti;
vector<pair<int,pll>> adj[N];
void pre(int v,int p){
par[v][0] = p;
tin[v] = T++;
ti.pb(v);
sz[v] = 1;
for (auto u : adj[v]){
if (u.X == p) continue;
h[u.X] = h[v]+1;
d[u.X][0] = d[v][0]+u.Y.X;
d[u.X][1] = d[v][1]+u.Y.Y;
pre(u.X,v);
up[v] += up[u.X]+u.Y.Y;
sz[v] += sz[u.X];
}
}
void dfs(int v,int p){
if (adj[v].size() == 1){
mx[v] = {d[v][0],v};
return;
}
ll a = -1,b = -1;
pll pa = {-1,-1};
for (auto u : adj[v]){
if (u.X == p) continue;
dfs(u.X,v);
mx[v] = max(mx[v],mx[u.X]);
if (mx[u.X].X > a){
swap(pa.X,pa.Y);
b = a;
a = mx[u.X].X;
pa.X = mx[u.X].Y;
}
else if (mx[u.X].X > b){
b = mx[u.X].X;
pa.Y = mx[u.X].Y;
}
}
if (b == -1) return;
ll calc = sum-up[r]+d[v][1]-d[v][0]-a-b+2*d[v][0];
if (calc < opt[2]){
opt[2] = calc;
U = pa.X;
V = pa.Y;
lc = v;
}
}
int lca(int u,int v){
if (h[u] < h[v]) swap(u,v);
repr(i,19,0){
if ((1 << i) <= h[u]-h[v]) u = par[u][i];
}
if (v == u) return v;
repr(i,19,0){
if (par[v][i] != par[u][i]){
v = par[v][i];
u = par[u][i];
}
}
return par[v][0];
}
void build(int l,int r,int v = 1){
if (r-l == 1){
int u = ti[l];
if (u == U || u == V || adj[u].size() != 1){
seg[v] = {0,u};
return;
}
int lc2 = lca(lc,u);
if (lc2 != lc){
seg[v] = {d[u][0]-d[lc2][0]+d[lc][1]-d[lc2][1],u};
return;
}
lc2 = lca(u,U);
if (lc2 == lc) lc2 = lca(u,V);
seg[v] = {d[u][0]-d[lc2][0],u};
return;
}
int m = (l+r) >> 1,u = (v << 1);
build(l,m,u);
build(m,r,u|1);
seg[v] = max(seg[u],seg[u|1]);
}
void upd(int l,int r,int s,int e,ll x,int v = 1){
if (l >= e || s >= r || s >= e) return;
if (s <= l && r <= e){
seg[v].X += x;
lz[v] += x;
return;
}
int m = (l+r) >> 1,u = (v << 1);
if (lz[v]){
seg[u].X += lz[v];
seg[u|1].X += lz[v];
lz[u] += lz[v];
lz[u|1] += lz[v];
lz[v] = 0;
}
upd(l,m,s,e,x,u);
upd(m,r,s,e,x,u|1);
seg[v] = max(seg[u],seg[u|1]);
}
int main(){
ios :: sync_with_stdio(0); cin.tie(0);
memset(opt,63,sizeof opt);
int n;
cin >> n;
rep(i,1,n){
int u,v,a,b;
cin >> u >> v >> a >> b;
adj[u].pb({v,{a,b}});
adj[v].pb({u,{b,a}});
sum += a;
sum += b;
}
if (n == 2){
int q;
cin >> q;
while (q--){
int t;
cin >> t;
if (t == 2){
cout << 0 << endl;
continue;
}
if (t == 1){
cout << min(adj[1][0].Y.Y,adj[1][0].Y.X) << endl;
continue;
}
}
return 0;
}
rep(i,1,n+1) if (adj[i].size() > 1) r = i;
pre(r,0);
rep(j,1,20){
rep(i,1,n+1){
par[i][j] = par[par[i][j-1]][j-1];
}
}
int leaf = 0;
rep(i,1,n+1){
opt[1] = min(opt[1],sum-up[r]+d[i][1]-d[i][0]);
leaf += (adj[i].size() == 1);
}
dfs(r,0);
set<int> st;
st.insert(tin[U]);
st.insert(tin[V]);
int q;
cin >> q;
build(0,n);
rep(i,3,leaf){
pll p = seg[1];
int v = seg[1].Y;
upd(0,n,tin[v],tin[v]+1,-1ll*inf*inf);
opt[i] = opt[i-1]-p.X;
int lc2 = lca(v,lc);
if (lc2 != lc){
st.insert(tin[v]);
int cur = par[lc][0],perv = lc;
while (perv != lc2){
upd(0,n,tin[cur],tin[cur]+sz[cur],-(d[perv][1]-d[cur][1]));
upd(0,n,tin[perv],tin[perv]+sz[perv],d[perv][1]-d[cur][1]);
perv = cur;
cur = par[cur][0];
}
lc = lc2;
continue;
}
auto it = st.lower_bound(tin[v]);
if (it != st.end()){
int u = ti[*it];
lc2 = lca(v,u);
}
if (it != st.begin() && lc2 == lc){
it--;
int u = ti[*it];
lc2 = lca(u,v);
}
st.insert(tin[v]);
int cur = par[v][0];
while(cur != lc2){
upd(0,n,tin[cur],tin[cur]+sz[cur],-(d[cur][0]-d[par[cur][0]][0]));
cur = par[cur][0];
}
}
while (q--){
int t;
cin >> t;
if (t >= leaf){
cout << 0 << endl;
continue;
}
cout << opt[t] << endl;
}
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6484 KB |
Output is correct |
| 2 |
Correct |
3 ms |
6612 KB |
Output is correct |
| 3 |
Correct |
3 ms |
6612 KB |
Output is correct |
| 4 |
Incorrect |
3 ms |
6612 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6484 KB |
Output is correct |
| 2 |
Execution timed out |
2077 ms |
52192 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
6500 KB |
Output is correct |
| 2 |
Execution timed out |
2094 ms |
52916 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6484 KB |
Output is correct |
| 2 |
Correct |
3 ms |
6612 KB |
Output is correct |
| 3 |
Correct |
3 ms |
6612 KB |
Output is correct |
| 4 |
Incorrect |
3 ms |
6612 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6484 KB |
Output is correct |
| 2 |
Execution timed out |
2077 ms |
52192 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6484 KB |
Output is correct |
| 2 |
Correct |
3 ms |
6612 KB |
Output is correct |
| 3 |
Correct |
3 ms |
6612 KB |
Output is correct |
| 4 |
Incorrect |
3 ms |
6612 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
