結果
| 問題 |
No.529 帰省ラッシュ
|
| コンテスト | |
| ユーザー |
beet
|
| 提出日時 | 2017-11-07 02:33:12 |
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 357 ms / 4,500 ms |
| コード長 | 6,213 bytes |
| コンパイル時間 | 2,969 ms |
| コンパイル使用メモリ | 202,612 KB |
| 実行使用メモリ | 58,636 KB |
| 最終ジャッジ日時 | 2024-12-17 20:06:53 |
| 合計ジャッジ時間 | 7,692 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 18 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:253:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
253 | scanf("%d %d %d",&n,&e,&q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~
main.cpp:274:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
274 | scanf("%d",&d);
| ~~~~~^~~~~~~~~
main.cpp:277:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
277 | scanf("%d %d",&u,&w);
| ~~~~~^~~~~~~~~~~~~~~
main.cpp:288:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
288 | scanf("%d %d",&s,&t);
| ~~~~~^~~~~~~~~~~~~~~
main.cpp: In member function ‘void BiconectedGraph::input(int, int)’:
main.cpp:137:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
137 | scanf("%d %d",&a,&b);
| ~~~~~^~~~~~~~~~~~~~~
ソースコード
#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//BEGIN CUT HERE
struct HLDecomposition {
int n,pos;
vector<vector<int> > G;
vector<int> vid, head, heavy, parent, depth, inv, type;
HLDecomposition(){}
HLDecomposition(int sz):
n(sz),pos(0),G(n),
vid(n,-1),head(n),heavy(n,-1),parent(n),depth(n),inv(n),type(n){}
void add_edge(int u, int v) {
G[u].push_back(v);
G[v].push_back(u);
}
void build(vector<int> rs=vector<int>(1,0)) {
int c=0;
for(int r:rs){
dfs(r, -1);
bfs(r, c++);
}
}
using T = tuple<int,int,int,int,int,int>;
int dfs(int curr,int prev) {
stack<T> st;
int result;
int sub,max_sub,i,next;
ENTRYPOINT:
parent[curr] = prev;
sub=1;
max_sub=0;
for(i=0;i<(int)G[curr].size();i++){
next=G[curr][i];
if(next!=prev) {
depth[next]=depth[curr]+1;
{
st.emplace(curr,prev,sub,max_sub,i,next);
prev=curr;curr=next;
goto ENTRYPOINT;
}
RETURNPOINT:
T t=st.top();st.pop();
tie(curr,prev,sub,max_sub,i,next)=t;
int sub_next=result;
sub+=sub_next;
if(max_sub<sub_next)
max_sub=sub_next,heavy[curr]=next;
}
}
while(!st.empty()){
result=sub;
goto RETURNPOINT;
}
return sub;
}
void bfs(int r,int c) {
int &k=pos;
queue<int> q({r});
while(!q.empty()){
int h=q.front();q.pop();
for(int i=h;i!=-1;i=heavy[i]) {
type[i]=c;
vid[i]=k++;
inv[vid[i]]=i;
head[i]=h;
for(int j:G[i])
if(j!=parent[i]&&j!=heavy[i]) q.push(j);
}
}
}
// for_each(vertex)
// [l,r] <- attention!!
void for_each(int u, int v, const function<void(int, int)>& f) {
while(1){
if (vid[u] > vid[v]) swap(u, v);
f(max(vid[head[v]], vid[u]), vid[v]);
if (head[u] != head[v]) v=parent[head[v]];
else break;
}
}
// for_each(edge)
// [l,r] <- attention!!
void for_each_edge(int u, int v, const function<void(int, int)>& f) {
while(1){
if(vid[u] > vid[v]) swap(u,v);
if(head[u] != head[v]){
f(vid[head[v]],vid[v]);
v=parent[head[v]];
} else{
if(u!=v) f(vid[u]+1,vid[v]);
break;
}
}
}
int lca(int u,int v){
while(1){
if(vid[u]>vid[v]) swap(u,v);
if(head[u]==head[v]) return u;
v=parent[head[v]];
}
}
int distance(int u,int v){
return depth[u]+depth[v]-2*depth[lca(u,v)];
}
};
//END CUT HERE
struct BiconectedGraph{
typedef pair<int,int> P;
int n;
vector<vector<int> > G,C,T;
vector<int> ord,low,belong;
vector<P> B;
BiconectedGraph(){}
BiconectedGraph(int sz):n(sz),G(sz),C(sz),T(sz){}
void add_edge(int u,int v){
G[u].push_back(v);
G[v].push_back(u);
}
void input(int m,int offset){
int a,b;
for(int i=0;i<m;i++){
scanf("%d %d",&a,&b);
add_edge(a+offset,b+offset);
}
}
bool is_bridge(int u,int v){
if(ord[u]>ord[v]) swap(u,v);
return ord[u]<low[v];
}
void dfs(int u,int p,int &k){
ord[u]=low[u]=k;
++k;
for(int v:G[u]){
if(v==p) continue;
if(ord[v]>=0){
low[u]=min(low[u],ord[v]);
}else{
dfs(v,u,k);
low[u]=min(low[u],low[v]);
}
if(is_bridge(u,v)) B.push_back(P(u,v));
}
}
void fill_component(int c,int u){
C[c].push_back(u);
belong[u]=c;
for(int v:G[u]){
if(belong[v]>=0||is_bridge(u,v)) continue;
fill_component(c,v);
}
}
void add_component(int u,int &k){
if(belong[u]>=0) return;
fill_component(k++,u);
}
int build(){
int k=0;
ord.resize(n);
low.resize(n);
belong.resize(n);
fill(ord.begin(),ord.end(),-1);
fill(belong.begin(),belong.end(),-1);
for(int u=0;u<n;u++){
if(ord[u]>=0) continue;
dfs(u,-1,k);
}
k=0;
for(int i=0;i<(int)B.size();i++){
add_component(B[i].first,k);
add_component(B[i].second,k);
}
for(int u=0;u<n;u++) add_component(u,k);
for(int i=0;i<(int)B.size();i++){
int u=belong[B[i].first],v=belong[B[i].second];
T[u].push_back(v);
T[v].push_back(u);
}
return k;
}
};
template <typename T,typename E>
struct SegmentTree{
typedef function<T(T,T)> F;
typedef function<T(T,E)> G;
int n;
F f;
G g;
T d1;
E d0;
vector<T> dat;
SegmentTree(){};
SegmentTree(int n_,F f,G g,T d1,
vector<T> v=vector<T>()):
f(f),g(g),d1(d1){
init(n_);
if(n_==(int)v.size()) build(n_,v);
}
void init(int n_){
n=1;
while(n<n_) n*=2;
dat.clear();
dat.resize(2*n-1,d1);
}
void build(int n_, vector<T> v){
for(int i=0;i<n_;i++) dat[i+n-1]=v[i];
for(int i=n-2;i>=0;i--)
dat[i]=f(dat[i*2+1],dat[i*2+2]);
}
void update(int k,E a){
k+=n-1;
dat[k]=g(dat[k],a);
while(k>0){
k=(k-1)/2;
dat[k]=f(dat[k*2+1],dat[k*2+2]);
}
}
inline T query(int a,int b){
T vl=d1,vr=d1;
for(int l=a+n,r=b+n;l<r;l>>=1,r>>=1) {
if(l&1) vl=f(vl,dat[(l++)-1]);
if(r&1) vr=f(dat[(--r)-1],vr);
}
return f(vl,vr);
}
};
signed main(){
int n,e,q;
scanf("%d %d %d",&n,&e,&q);
BiconectedGraph big(n);
big.input(e,-1);
int E=0,V=big.build();
HLDecomposition hl(V);
for(int i=0;i<V;i++)
for(int j:big.T[i])
if(i<j) hl.add_edge(i,j),E++;
hl.build();
SegmentTree<int,int> rmq(V,
[](int a,int b){return max(a,b);},
[](int a,int b){return b;},
-1);
vector<priority_queue<int> > pq(V);
map<int,int> m;
int num=0;
for(int i=0;i<q;i++){
int d;
scanf("%d",&d);
if(d==1){
int u,w;
scanf("%d %d",&u,&w);
u--;
u=big.belong[u];
u=hl.vid[u];
m[w]=u;
if(pq[u].empty()||pq[u].top()<w) rmq.update(u,w);
pq[u].push(w);
num++;
}
if(d==2){
int s,t;
scanf("%d %d",&s,&t);
s--;t--;
s=big.belong[s];
t=big.belong[t];
int ans=-1;
hl.for_each(s, t, [&](int l, int r) {
ans = max(ans,rmq.query(l, r + 1));
});
printf("%d\n",ans);
if(~ans){
int k=m[ans];
pq[k].pop();
rmq.update(k,(!pq[k].empty()?pq[k].top():-1));
num--;
}
}
}
return 0;
}
/* verified on 2017/11/07
https://yukicoder.me/problems/no/529
*/
beet