Submission #967806

#	Time	Username	Problem	Language	Result	Execution time	Memory
967806		shadow_sami	Dynamic Diameter (CEOI19_diameter)	C++17	24 / 100	223 ms	58612 KiB

diameter

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
typedef pair<ll,ll> pi;
typedef map<ll,ll> mi;
typedef long double ld;
typedef vector<ld> vd;
typedef vector<vector<ld>> vvd;
// typedef pair<ld,ld> pd;
#define ff first
#define ss second
#define srt(a) sort(a.begin(),a.end());
#define fip(k, n) for (ll i = k; i < n; i++)
#define fjp(k, n) for (ll j = k; j < n; j++)
#define fin(k, n) for (ll i = k; i >= n; i--)
#define fjn(k, n) for (ll j = k; j >= n; j--)
#define fp(k, n, m) for (ll k = n; k < m; k++)
#define fn(k, n, m) for (ll k = n; k >= m; k--)
#define ordered_set tree<pi, null_type,less< pi >, rb_tree_tag,tree_order_statistics_node_update>
#define totalOne(n) __builtin_popcount(n)
#define backZero(n) __builtin_ctzll(n)
#define frontZero(n) __builtin_clzll(n)
#define fx(k) for ( auto x : k )
#define test ll t;cin >> t;while (t--)
#define nli "\n"
 
// ==========================(debug)============================================================================================== //
 
#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _printn(x); cerr << nli;
#else
#define debug(x)
#endif
 
void _printn(ll x){ cerr<<x<<" "; }
void _printn(int x){ cerr<<x<<" "; }
void _printn(ld x){ cerr<<x<<" "; }
void _printn(double x){ cerr<<x<<" "; }
void _printn(string x){ cerr<<x<<" "; }
void _printn(char x){ cerr<<x<<" "; }
void _printn(bool x){ cerr<<x<<" "; }
template<class T,class V>void _printn(pair<T,V> vv);
template<class T> void _printn(vector<T> vv);
template<class T> void _printn(set<T> vv);
template<class T,class V> void _printn(map<T,V> vv);
template<class T> void _printn(multiset<T> vv);
template<class T,class V>void _printn(pair<T,V> vv){ cerr<<"( ";_printn(vv.ff);cerr<<",";_printn(vv.ss);cerr<<")";}
template<class T> void _printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T> void _printn(set<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T> void _printn(multiset<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T,class V> void _printn(map<T,V> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
 
// ==========================(debug)============================================================================================== //
 
ll n,m,tp,tp2,res,cnt,sum,tptp,ans;
const ll mx = 5e5+5;
const ll mod = 1e9+7;
 
// ==========================(MOD)=============================================================================================== //
 
ll mod_add(ll aa,ll bb){ return ((aa%mod)+(bb%mod))%mod; }
ll mod_minus(ll aa,ll bb){ return (((aa%mod)-(bb%mod))+10*mod)%mod; }
ll mod_mul(ll aa,ll bb){ return ((aa%mod)*(bb%mod))%mod; }
ll mod_power(ll aa,ll bb){ aa%=mod; ll empowered = 1; bb%=mod-1; while(bb > 0){ if(bb & 1) empowered = mod_mul(empowered,aa); bb = bb >> 1; aa = mod_mul(aa,aa); } return empowered; }
ll mod_divi(ll aa,ll bb){ aa=mod_mul(aa,mod_power(bb,mod-2)); return aa; }
 
// ==========================(MOD)=============================================================================================== //
 
bool f = false;
vector<pi> adj[mx];
ll c[mx];
ll dp[mx];
ll to[mx];
ll st[mx];
ll id[mx];
ll en[mx];
ll sr,de;
ll aeh[mx];
ll timer = 0;
 
typedef struct SEGMENT_TREE{
	vi arr;
	vi laz;
	ll range;
	void init(ll k){
		range = 4 * k;
		arr.resize(range);
		laz.resize(range);
		fip(0,range)
			laz[i] = arr[i] = 0;
		return;
	}
	void prop(ll ptr,ll l,ll r){
		if(laz[ptr]){
			arr[ptr] += laz[ptr];
			if(l!=r){
				laz[2*ptr] += laz[ptr];
				laz[2*ptr+1] += laz[ptr];
			}
			laz[ptr] = 0;
		}
		return;
	}
	ll build(ll ptr,ll l,ll r){
		if(l==r){
			arr[ptr] = dp[id[l]];
			return arr[ptr];
		}
		ll mid = l + (r-l) / 2;
		build(2*ptr,l,mid);
		build(2*ptr+1,mid+1,r);
		arr[ptr] = max(arr[2*ptr],arr[2*ptr+1]);
		return arr[ptr];
	}
	ll update(ll ptr,ll l,ll r,ll st,ll en,ll val){
		prop(ptr,l,r);
		if(l>en || r<st)
			return arr[ptr];
		if(l>=st && r<=en){
			laz[ptr] += val;
			prop(ptr,l,r);
			return arr[ptr];
		}
		ll mid = l +(r-l) / 2;
		update(2*ptr,l,mid,st,en,val);
		update(2*ptr+1,mid+1,r,st,en,val);
		arr[ptr] = max(arr[2*ptr],arr[2*ptr+1]);
		return arr[ptr];
	}
	ll query(ll ptr,ll l,ll r,ll st,ll en){
		prop(ptr,l,r);
		if(l>en || r<st)
			return -1e18;
		if(l>=st && r<=en)
			return arr[ptr];
		ll mid = l +(r-l) / 2;
		return max(query(2*ptr,l,mid,st,en),query(2*ptr+1,mid+1,r,st,en));
	}
}SGT;
 
SGT sg;
 
void dfs(ll u,ll par){
	st[u] = timer;
	id[timer] = u;
	timer++;
	fx(adj[u])
		if(x.ff!=par){
			dp[x.ff] = dp[u] + c[x.ss];
			dfs(x.ff,u);
			to[x.ss] = x.ff;
		}
	en[u] = timer - 1;
	return;
}
 
void dfs2(ll u,ll par,ll k){
	aeh[u] = k;
	fx(adj[u])
		if(x.ff!=par)
			dfs2(x.ff,u,k);
	return;
}
 
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    // #ifndef ONLINE_JUDGE
    //     freopen("input1.txt", "r", stdin);
    //     freopen("output1.txt", "w", stdout);
    //     freopen("error1.txt", "w", stderr);
    // #endif // ONLINE_JUDGE
 
        cin>>n>>m>>tp;
        fip(0,n-1){
        	cin>>sr>>de>>tptp;
        	adj[sr].push_back({de,i});
        	adj[de].push_back({sr,i});
        	c[i] = tptp;
    	}
    	res = 0;
    	dp[1] = 0;
		dfs(1,-1);    	
		sg.init(n)	;
		sg.build(1,0,n-1);
		// fip(1,n+1)
		// 	cout<<dp[i]<<" ";
		// cout<<nli;
		// fip(1,n+1)
		// 	cout<<st[i]<<" ";
		// cout<<nli;
		// fip(1,n+1)
		// 	cout<<en[i]<<" ";
		// cout<<nli;
		// fip(0,n)
		// 	cout<<id[i]<<" ";
		// cout<<nli;
		// fip(1,n+1)
		// 	cout<<sg.query(1,0,n-1,st[i],st[i])<<" ";
		// cout<<nli;
		set<ll> s;
		fx(adj[1])
			dfs2(x.ff,1,x.ff);
		// fip(1,1+n)
		// 	cout<<aeh[i]<<" ";
		// cout<<nli;
		fx(adj[1])
			s.insert(-sg.query(1,0,n-1,st[x.ff],en[x.ff]));
		// debug(s);
    	while(m--){
    		cin>>sr>>de;
    		sr += res;
    		sr %= (n-1);
    		de += res;
    		de %= (tp);    		
    		tp2 = aeh[to[sr]];
    		ans = 0;
    		// debug(tp2);
    		s.erase(s.find(-sg.query(1,0,n-1,st[tp2],en[tp2])));
    		// debug(s);
    		sg.update(1,0,n-1,st[to[sr]],en[to[sr]],de - c[sr]);
    		c[sr] = de;
    		s.insert(-sg.query(1,0,n-1,st[tp2],en[tp2]));    		
    		// debug(s);
    		if(s.size()){
    			// debug(st);
    			tp2 = *s.begin();
    			s.erase(s.begin());
    			ans = max(ans,-tp2);
    			if(s.size())
    				ans = max(ans,-tp2-(*s.begin()));
    			s.insert(tp2);
    		}
    		cout<<ans<<nli;    		
    		res = ans;
    	}
        
    // cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

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