/// stiu ca nu e bn
#include <bits/stdc++.h>
#define DIM 1000010
using namespace std;
int whatChain[DIM],positionInChain[DIM],chainFatherNode[DIM],level[DIM],Size[DIM],fth[DIM];
int E[DIM*4],p[DIM*4],first[DIM],viz[DIM];
pair <int,int> rmq[30][DIM];
vector <int> chains[DIM],L[DIM];
int nr_chains;
struct segment_tree{
int maxi,mini,lazy;
};
vector <segment_tree> aint[DIM];
struct _update{
int x,y,val,dist;
};
_update v[DIM];
int n,m,i,j,x,y,val,dist,lca,k;
char ch;
void dfs (int nod, int tata){
E[++k] = nod;
first[nod] = k;
viz[nod] = Size[nod] = 1;
level[nod] = 1 + level[tata];
fth[nod] = tata;
int ok = 0;
for (int i=0;i<L[nod].size();i++){
int vecin = L[nod][i];
if (!viz[vecin]){
ok = 1;
dfs (vecin,nod);
Size[nod] += Size[vecin];
E[++k] = nod;
}}
if (!ok){
nr_chains++;
chains[nr_chains].push_back(0);
chains[nr_chains].push_back(nod);
whatChain[nod] = nr_chains;
positionInChain[nod] = 1;
} else {
int maxim = 0, poz = 0;
for (int i=0;i<L[nod].size();i++){
int fiu = L[nod][i];
if (fiu == tata)
continue;
if (Size[fiu] > maxim){
maxim = Size[fiu];
poz = fiu;
}}
chains[whatChain[poz]].push_back(nod);
whatChain[nod] = whatChain[poz];
positionInChain[nod] = chains[whatChain[poz]].size()-1;
for (int i=0;i<L[nod].size();i++){
int fiu = L[nod][i];
if (fiu == tata)
continue;
if (fiu != poz)
chainFatherNode[whatChain[fiu]] = nod;
}}}
int get_lca (int x, int y){
int posx = first[x], posy = first[y];
if (posx > posy)
swap (posx,posy);
int nr = p[posy-posx+1];
pair <int,int> sol = min (rmq[nr][posx],rmq[nr][posy-(1<<nr)+1]);
return E[sol.second];
}
void update_lazy (int chain, int nod, int st, int dr){
if (!aint[chain][nod].lazy)
return;
if (st != dr){
int fiu_st = nod<<1, fiu_dr = (nod<<1)|1;
aint[chain][fiu_st].mini = aint[chain][fiu_st].maxi = aint[chain][nod].lazy;
aint[chain][fiu_dr].mini = aint[chain][fiu_dr].maxi = aint[chain][nod].lazy;
aint[chain][fiu_st].lazy = aint[chain][fiu_dr].lazy = aint[chain][nod].lazy;
}
aint[chain][nod].lazy = 0;
}
void update_nod (int chain, int nod, int st, int dr){
int fiu_st = nod<<1, fiu_dr = (nod<<1)|1;
aint[chain][nod].maxi = max (aint[chain][fiu_st].maxi,aint[chain][fiu_dr].maxi);
aint[chain][nod].mini = min (aint[chain][fiu_st].mini,aint[chain][fiu_dr].mini);
}
void update_aint (int chain, int nod, int st, int dr, int x, int y, int val){
update_lazy (chain,nod,st,dr);
if (x <= st && dr <= y){
aint[chain][nod].mini = aint[chain][nod].maxi = val;
aint[chain][nod].lazy = val;
update_lazy(chain,nod,st,dr);
return;
}
int mid = (st+dr)>>1;
if (x <= mid)
update_aint(chain,nod<<1,st,mid,x,y,val);
if (y > mid)
update_aint(chain,(nod<<1)|1,mid+1,dr,x,y,val);
update_lazy (chain,nod<<1,st,mid);
update_lazy (chain,(nod<<1)|1,mid+1,dr);
update_nod (chain,nod,st,dr);
}
int get_val (int chain, int nod, int st, int dr, int poz){
update_lazy(chain,nod,st,dr);
if (st == dr)
return aint[chain][nod].maxi;
int mid = (st+dr)>>1;
if (poz <= mid)
return get_val (chain,nod<<1,st,mid,poz);
else return get_val(chain,(nod<<1)|1,mid+1,dr,poz);
}
void update_heavy (int x, int y, int val){
if (whatChain[x] == whatChain[y]){
int posx = positionInChain[x], posy = positionInChain[y];
if (posx > posy)
swap (posx,posy), swap (x,y);
if (x == lca)
posx++;
if (y == lca)
posy--;
if (posx <= posy)
update_aint(whatChain[x],1,1,chains[whatChain[x]].size()-1,posx,posy,val);
return;
}
if (level[chainFatherNode[whatChain[x]]] <= level[chainFatherNode[whatChain[y]]])
swap (x,y);
int posx = positionInChain[x], posy = chains[whatChain[x]].size()-1;
if (chains[whatChain[x]][posx] == lca)
posx++;
if (chains[whatChain[x]][posy] == lca)
posy--;
if (posx <= posy)
update_aint(whatChain[x],1,1,chains[whatChain[x]].size()-1,posx,posy,val);
int nr = chainFatherNode[whatChain[x]];
update_heavy (nr,y,val);
}
inline int cmp (_update a, _update b){
return a.dist > b.dist;
}
int main (){
// ifstream cin ("minmaxtree.in");
// ofstream cout ("minmaxtree.out");
cin>>n;
for (i=1;i<n;i++){
cin>>x>>y;
L[x].push_back(y);
L[y].push_back(x);
}
dfs (1,0);
for (i=1;i<=nr_chains;i++){
for (j=0;j<chains[i].size()*4;j++)
aint[i].push_back({0,0,0});
}
for (i=1;i<=k;i++)
rmq[0][i] = make_pair (level[E[i]],i);
for (i=1;(1<<i)<=k;i++){
for (j=1;j<=k;j++){
rmq[i][j] = rmq[i-1][j];
if (j + (1<<(i-1)) <= k && rmq[i-1][j + (1<<(i-1))].first < rmq[i][j].first)
rmq[i][j] = rmq[i-1][j + (1<<(i-1))];
}
}
for (i=2;i<=k;i++)
p[i] = p[i/2] + 1;
/// am numai maxime
cin>>m;
for (i=1;i<=m;i++){
cin>>ch>>x>>y>>val;
lca = get_lca (x,y);
dist = level[x] + level[y] - 2 * level[lca];
v[i] = {x,y,val,dist};
}
sort (v+1,v+m+1,cmp);
for (i=1;i<=m;i++){
int x = v[i].x, y = v[i].y, val = v[i].val;
lca = get_lca (x,y);
update_heavy(x,y,val);
}
for (i=2;i<=n;i++){
int val = get_val (whatChain[i],1,1,chains[whatChain[i]].size()-1,positionInChain[i]);
cout<<i<<" "<<fth[i]<<" "<<val<<"\n";
}
return 0;
}
Compilation message
minmaxtree.cpp: In function 'void dfs(int, int)':
minmaxtree.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0;i<L[nod].size();i++){
~^~~~~~~~~~~~~~
minmaxtree.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0;i<L[nod].size();i++){
~^~~~~~~~~~~~~~
minmaxtree.cpp:59:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0;i<L[nod].size();i++){
~^~~~~~~~~~~~~~
minmaxtree.cpp: In function 'int main()':
minmaxtree.cpp:171:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (j=0;j<chains[i].size()*4;j++)
~^~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
46 ms |
70904 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
366 ms |
106724 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
243 ms |
106488 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
46 ms |
70904 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
