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Submission #968347

#TimeUsernameProblemLanguageResultExecution timeMemory
968347shadow_samiDynamic Diameter (CEOI19_diameter)C++17
100 / 100
3903 ms386504 KiB
#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; const ll mxn = 20; vector<pi> adj[mx]; ll aa[mx]; ll bb[mx]; ll c[mx]; ll val[mx]; ll to[mx][mxn]; bool mark[mx]; ll sz[mx]; ll st[mx][mxn]; ll en[mx][mxn]; ll id[mx][mxn]; ll id2[mx][mxn]; ll sr,de; ll timer[mxn]; typedef struct SEGMENT_TREE{ vi arr; vi laz; vi mid; ll range; void init(ll k){ range = 4 * k; arr.resize(range); mid.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] = 0; return arr[ptr]; } mid[ptr] = l + (r-l) / 2; build(2*ptr,l,mid[ptr]); build(2*ptr+1,mid[ptr]+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]; } update(2*ptr,l,mid[ptr],st,en,val); update(2*ptr+1,mid[ptr]+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]; return max(query(2*ptr,l,mid[ptr],st,en),query(2*ptr+1,mid[ptr]+1,r,st,en)); } }SGT; SGT sg[mxn]; priority_queue<pi> les[mx]; priority_queue<pi> sol,ptt; ll dp[mx][mxn]; ll dp2[mx]; void dfs(ll u,ll par){ sz[u] = 1; fx(adj[u]){ if(x.ff==par || mark[x.ff])continue; dfs(x.ff,u); sz[u] += sz[x.ff]; } return; } ll get(ll u,ll par,ll k){ fx(adj[u]){ if(x.ff==par || mark[x.ff])continue; if(sz[x.ff]*2>k) return get(x.ff,u,k); } return u; } void ds(ll u,ll par,ll k,ll d,ll p,ll pp){ to[u][k] = par; id[u][k] = p; id2[u][k] = pp; st[u][k] = timer[k]++; sg[k].update(1,0,n-1,st[u][k],st[u][k],d); fx(adj[u]){ if(x.ff==par || mark[x.ff])continue; ds(x.ff,u,k,d+c[x.ss],p,pp); } en[u][k] = timer[k]-1; return; } pi pt,pt2; ll calc(ll d,ll k){ while(les[d].size()&& dp[les[d].top().ss][k]!=les[d].top().ff) les[d].pop(); if(!les[d].size()) return 0; // ptt = les[d]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; pt = les[d].top(); // debug(pt); pt2 = {0,0}; while(les[d].size() && ((dp[les[d].top().ss][k]!=les[d].top().ff) || (les[d].top()==pt))){ // debug(les[d].top()); // debug(pt); // debug((dp[les[d].top().ss][k])); // cerr<<nli; les[d].pop(); } // debug((ll)les[d].size()); // ptt = les[d]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; if(les[d].size()) pt2 = les[d].top(); // debug(pt2); les[d].push(pt); return pt.ff+pt2.ff; } void divide(ll u,ll d){ dfs(u,-1); u = get(u,-1,sz[u]); // debug(u); mark[u] = 1; val[u] = d; fx(adj[u]) if(!mark[x.ff]){ ds(x.ff,u,d,c[x.ss],u,x.ff); les[u].push({dp[x.ff][d] = sg[d].query(1,0,n-1,st[x.ff][d],en[x.ff][d]),x.ff}); } // fip(1,n+1) // cerr<<st[i][d]<<" "; // cerr<<nli; // fip(1,n+1) // cerr<<en[i][d]<<" "; // cerr<<nli; // ptt = les[u]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; sol.push({dp2[u] = calc(u,d),u}); // ptt = sol; // while(ptt.size()){ // // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; // // cerr<<"non"<<nli; // // ptt = les[1]; // // while(ptt.size()){ // // debug(ptt.top()); // // ptt.pop(); // // } // // cerr<<nli; fx(adj[u]) if(!mark[x.ff]) divide(x.ff,d+1); return; } void update(ll a,ll b){ // debug(a); // debug(b); fjp(0,mxn){ if(val[a]<j || val[b]<j) break; if(to[a][j]==b) swap(a,b); // debug(id[b][j]); // debug(de-c[sr]); // debug(id2[b][j]); // debug(st[b][j]); // debug(en[b][j]); // fip(1,n+1) // cerr<<sg[j].query(1,0,n-1,st[i][j],st[i][j])<<" "; // cerr<<nli; sg[j].update(1,0,n-1,st[b][j],en[b][j],de-c[sr]); // ptt = les[id[b][j]]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; les[id[b][j]].push({dp[id2[b][j]][j] = sg[j].query(1,0,n-1,st[id2[b][j]][j],en[id2[b][j]][j]),id2[b][j]}); // ptt = les[id[b][j]]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; // cerr<<"calc"<<nli; sol.push({dp2[id[b][j]] = calc(id[b][j],j),id[b][j]}); // cerr<<"calc"<<nli; // ptt = les[id[b][j]]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; } while(sol.size() && dp2[sol.top().ss]!=sol.top().ff) sol.pop(); 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; aa[i] = sr; bb[i] = de; } res = 0; fip(0,mxn){ sg[i].init(n); sg[i].build(1,0,n-1); } divide(1,0); // ptt = sol; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; // cerr<<"non"<<nli; // ptt = les[1]; // while(ptt.size()){ // debug(ptt.top()); // ptt.pop(); // } // cerr<<nli; // cerr<<nli; // cerr<<"start"<<nli; while(m--){ cin>>sr>>de; sr += res; sr %= (n-1); de += res; de %= (tp); ans = 0; // debug(sr); // debug(de); update(aa[sr],bb[sr]); ans = sol.top().ff; c[sr] = de; cout<<ans<<nli; res = ans; } // cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n"; return 0; }
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