제출 #540915

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
540915		jamezzz	Dynamic Diameter (CEOI19_diameter)	C++17	49 / 100	5088 ms	238504 KiB

diameter

#include <bits/stdc++.h>
using namespace std;
 
#ifdef DEBUG
#define dbg(...) printf(__VA_ARGS__);
#define getchar_unlocked getchar
#else
#define dbg(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb push_back
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
#define disc(x) sort(all(x));x.resize(unique(all(x))-x.begin());
typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef pair<ll,int> li;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;
mt19937 rng(time(0));
 
#define mod 1000000007
 
inline int add(int a,int b){
	int r=a+b;
	while(r>=mod)r-=mod;
	while(r<0)r+=mod;
	return r;
}
 
inline int mult(int a,int b){
	return (int)(((ll)(a*b))%mod);
}
 
inline int rd(){
	int x=0;
	char ch=getchar_unlocked();
	while(!(ch&16))ch=getchar();//keep reading while current character is whitespace
    while(ch&16){//this will break when ‘\n’ or ‘ ‘ is encountered
		x=(x<<3)+(x<<1)+(ch&15);
		ch=getchar_unlocked();
	}
	return x;
}
 
#define maxn 100005
 
struct edge{
	int u,v;ll w;
	vector<int> comp;
	vector<ii> range;
};
 
struct node{
	int s,e,m;
	li v;ll lz;
	node *l,*r;
	node(int _s,int _e){
		s=_s;e=_e;m=(s+e)/2;lz=0;v={0,s};
		if(s!=e)l=new node(s,m),r=new node(m+1,e);
	}
	void ppo(){
		v.fi+=lz;
		if(s!=e)l->lz+=lz,r->lz+=lz;
		lz=0;
	}
	void up(int x,int y,ll nv){
		if(s==x&&e==y){lz+=nv;return;}
		if(y<=m)l->up(x,y,nv);
		else if(x>m)r->up(x,y,nv);
		else l->up(x,m,nv),r->up(m+1,y,nv);
		l->ppo();r->ppo();
		v=max(l->v,r->v);
	}
	void print(){
		pf("%d %d %lld %lld\n",s,e,v.fi,lz);
		if(s!=e)l->print(),r->print();
	}
};
 
struct tree{
	int s,e;
	node *root;
	vector<int> block;
	vector<ii> ranges;
	tree(int _s,int _e){
		s=_s;e=_e;
		root=new node(s,e);
		block.resize(e-s+1);
	}
	void up(int x,int y,ll nv){
		root->up(x,y,nv);
	}
	ll qry(){
		root->ppo();
		ll ans=root->v.fi;
		int i=block[root->v.se];
		root->up(ranges[i].fi,ranges[i].se,-LINF);
		if(root->v.fi>=0)ans+=root->v.fi;
		up(ranges[i].fi,ranges[i].se,LINF);
		return ans;
	}
	
}*root[maxn];
 
int n,q,sub[maxn];ll w;
bool mark[maxn];
vii AL[maxn];
vector<edge> edges;
 
void find_sz(int u,int p){
	sub[u]=1;
	for(auto[v,i]:AL[u]){
		if(mark[v]||v==p)continue;
		find_sz(v,u);
		sub[u]+=sub[v];
	}
}
 
int cnt;
vii ranges;
 
ii dfs(int u,int p,int c){
	ii range={cnt,cnt};++cnt;
	for(auto[v,i]:AL[u]){
		if(mark[v]||v==p)continue;
		ii res=dfs(v,u,c);
		edges[i].comp.pb(c);
		edges[i].range.pb(res);
		mxto(range.se,res.se);
		if(p==-1)ranges.pb(res);
	}
	return range;
}
 
void decomp(int u){
	dbg("decomp: %d\n",u);
	
	dbg("find centroid\n");
	find_sz(u,-1);
	int c=u;
	while(true){
		bool val=true;
		for(auto[v,i]:AL[c]){
			if(!mark[v]&&sub[v]<sub[c]&&sub[v]>sub[u]/2){
				c=v;val=false;break;
			}
		}
		if(val)break;
	}
	
	dbg("centroid: %d\n",c);
	
	cnt=0;
	ranges.clear();
	
	dbg("dfs\n");
	dfs(c,-1,c);
	
	dbg("create node\n");
	root[c]=new tree(0,cnt-1);
	
	dbg("%d\n",sz(ranges));
	
	for(int i=0;i<sz(ranges);++i){
		dbg("add range: %d %d\n",ranges[i].fi,ranges[i].se);
		root[c]->ranges.pb(ranges[i]);
		for(int j=ranges[i].fi;j<=ranges[i].se;++j){
			root[c]->block[j]=i;
		}
	}
	
	mark[c]=true;
	for(auto[v,i]:AL[c]){
		if(!mark[v])decomp(v);
	}
}
 
int main(){
	sf("%d%d%lld",&n,&q,&w);
	for(int i=0;i<n-1;++i){
		int a,b;ll c;
		sf("%d%d%lld",&a,&b,&c);
		AL[a].pb({b,i});
		AL[b].pb({a,i});
		edges.pb({a,b,c,{},{}});
	}
	
	decomp(1);
	
	for(auto &e:edges){
		dbg("edge: %d %d %lld\n",e.u,e.v,e.w);
		for(int i=0;i<sz(e.comp);++i){
			ii rng=e.range[i];
			dbg("comp: %d %d %d\n",e.comp[i],rng.fi,rng.se);
			root[e.comp[i]]->up(rng.fi,rng.se,e.w);
		}
	}
	
	set<li> s;
	for(int i=1;i<=n;++i){
		if(root[i]->s==root[i]->e)continue;
		dbg("%d: %lld\n",i,root[i]->qry());
		s.insert({root[i]->qry(),i});
	}
	
	ll ans=0;
	for(int i=0;i<q;++i){
		int idx;ll nw;
		sf("%d%lld",&idx,&nw);
		idx=(idx+ans)%(n-1);
		nw=(nw+ans)%w;
		edge &e=edges[idx];
		ll ow=e.w;
		e.w=nw;
		
		//dbg("upd: %d %lld\n",idx,nw);
		
		for(int i=0;i<sz(e.comp);++i){
			ii rng=e.range[i];
			int c=e.comp[i];
			
			ll old=root[c]->qry();
			root[c]->up(rng.fi,rng.se,nw-ow);
			ll upd=root[c]->qry();
			s.erase(s.find({old,c}));
			s.insert({upd,c});
		}
		
		ans=(*--s.end()).fi;
		
		pf("%lld\n",ans);
	}
}

컴파일 시 표준 에러 (stderr) 메시지

diameter.cpp: In function 'int main()':
diameter.cpp:192:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  192 |  sf("%d%d%lld",&n,&q,&w);
      |    ^
diameter.cpp:195:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  195 |   sf("%d%d%lld",&a,&b,&c);
      |     ^
diameter.cpp:222:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  222 |   sf("%d%lld",&idx,&nw);
      |     ^

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 7 / 7
• Subtask 4: 18 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 27