제출 #876938

#제출 시각아이디문제언어결과실행 시간메모리
876938CookieDynamic Diameter (CEOI19_diameter)C++14
49 / 100
798 ms61680 KiB
#include<bits/stdc++.h> #include<fstream> using namespace std; ifstream fin("ANTNEST.INP"); ofstream fout("ANTNEST.OUT"); #define sz(a) (int)a.size() #define ll long long #define pb push_back #define forr(i, a, b) for(int i = a; i < b; i++) #define dorr(i, a, b) for(int i = a; i >= b; i--) #define ld long double #define vt vector #include<fstream> #define fi first #define se second #define pll pair<ll, ll> #define pii pair<int, int> #define mpp make_pair const ld PI = 3.14159265359; //using u128 = __uint128_t; //const int x[4] = {1, -1, 0, 0}; //const int y[4] = {0, 0, 1, -1}; const ll mod = 1e9 + 7; const int mxn = 2e5 + 5, mxq = 2e5 + 5, sq = 350, mxv = 5e5 + 5; const ll inf = 1e18; const ld prec = 1e-9; int n, q; ll MX; struct BIT{ ll bit[mxn + 1]; void upd(int p, int v){ while(p <= n){ bit[p] += v; p += p & (-p); } } ll get(int p){ ll ans = 0; while(p){ ans += bit[p]; p -= p & (-p); } return(ans); } ll query(int l, int r){ return(get(r) - get(l - 1)); } }; BIT bit; pii up[mxn + 1][19]; int tin[mxn + 1], tout[mxn + 1], siz[mxn + 1], dep[mxn + 1], tonode[mxn + 1], tt = 0, eu = 0, eutin[mxn + 1]; int u[mxn + 1], v[mxn + 1]; ll w[mxn + 1]; vt<pll>adj[mxn + 1]; pii getmn(int l, int r){ int lg = __lg(r - l + 1); return(min(up[l][lg], up[r - (1 << lg) + 1][lg])); } int lca(int u, int v){ if(tin[u] > tin[v])swap(u, v); return(getmn(tin[u], tin[v]).se); } ll getdist(int u, int v){ return(bit.get(eutin[u]) + bit.get(eutin[v]) - 2 * bit.get(eutin[lca(u, v)])); } void dfs(int s, int pre){ tin[s] = ++tt; tonode[tt] = s; siz[s] = 1; eutin[s] = ++eu; for(auto [i, w]: adj[s]){ if(i != pre){ dep[i] = dep[s] + 1; dfs(i, s); siz[s] += siz[i]; tonode[++tt] = s; } } tout[s] = tt; } struct Node{ int u, v; ll d; Node(){ } Node(int _u, int _v, ll _d){ u = _u; v = _v; d = _d; } friend bool operator <(Node a, Node b){ return(a.d < b.d); } friend Node operator +(Node a, Node b){ Node res = Node(-1, -1, -1); res = max(res, a); res = max(res, b); res = max(res, Node(a.u, b.u, getdist(a.u, b.u))); res = max(res, Node(a.u, b.v, getdist(a.u, b.v))); res = max(res, Node(a.v, b.u, getdist(a.v, b.u))); res = max(res, Node(a.v, b.v, getdist(a.v, b.v))); return(res); } }; Node st[4 * mxn + 1]; void build(int nd, int l, int r){ if(l == r){ st[nd] = Node(tonode[l], tonode[l], 0); return; } int mid = (l + r) >> 1; build(nd << 1, l, mid); build(nd << 1 | 1, mid + 1, r); st[nd] = st[nd << 1] + st[nd << 1 | 1]; } void upd(int nd, int l, int r, int ql, int qr){ if(ql > r || qr < l)return; if(ql <= l && qr >= r)return; int mid = (l + r) >> 1; upd(nd << 1, l, mid, ql, qr); upd(nd << 1 | 1, mid + 1, r, ql, qr); st[nd] = st[nd << 1] + st[nd << 1 | 1]; } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin >> n >> q >> MX; for(int i = 0; i < n - 1; i++){ cin >> u[i] >> v[i] >> w[i]; adj[u[i]].pb(mpp(v[i], w[i])); adj[v[i]].pb(mpp(u[i], w[i])); } dfs(1, -1); for(int i = 0; i < n - 1; i++){ if(dep[u[i]] > dep[v[i]])swap(u[i], v[i]); bit.upd(eutin[v[i]], w[i]); bit.upd(eutin[v[i]] + siz[v[i]], -w[i]); } for(int i = 1; i <= tt; i++)up[i][0] = mpp(dep[tonode[i]], tonode[i]); for(int i = 1; (1 << i) <= tt; i++){ for(int j = 1; j + (1 << i) - 1 <= tt; j++){ up[j][i] = min(up[j][i - 1], up[j + (1 << (i - 1))][i - 1]); } } build(1, 1, tt); ll last = 0; while(q--){ ll d, e; cin >> d >> e; d = (d + last) % (n - 1); e = (e + last) % MX; bit.upd(eutin[v[d]], e - w[d]); bit.upd(eutin[v[d]] + siz[v[d]], -(e - w[d])); upd(1, 1, tt, tin[v[d]], tout[v[d]]); last = st[1].d; w[d] = e; cout << last << "\n"; } return(0); }

컴파일 시 표준 에러 (stderr) 메시지

diameter.cpp: In function 'void dfs(int, int)':
diameter.cpp:68:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   68 |     for(auto [i, w]: adj[s]){
      |              ^
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