제출 #526553

#제출 시각아이디문제언어결과실행 시간메모리
526553kaxzertHarbingers (CEOI09_harbingers)C++17
10 / 100
1099 ms41932 KiB
/** ⚡⚡ ⚡⚡ ⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡ ⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ **/ #include<bits/stdc++.h> using namespace std; #define fto(i, a, b) for(int i = a; i <= b; ++i) #define fdto(i, a, b) for(int i = a; i >= b; --i) #define bugarr(a, i, j) cout << #a << "{" << i << "..." << j << "}:"; fto(k, i, j-1) cout << a[k] << ", "; cout << a[j] << endl; #define ll long long #define db double #define ldb long double #define ff first #define ss second #define pb push_back #define mp make_pair #define eb emplace_back #define vt vector #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() #define trav(i, a) for(auto &i : a) #define sz(a) (int)a.size() #define pi(a, b) pair<a, b> #define fast ios::sync_with_stdio(false); cin.tie(0) void setIO(string s) { if (sz(s) != 0) { freopen((s+".inp").c_str(),"r",stdin); freopen((s+".out").c_str(),"w",stdout); } } void setIOusaco(string s) { if (sz(s) != 0) { freopen((s+".in").c_str(),"r",stdin); freopen((s+".out").c_str(),"w",stdout); } } template<typename T, typename V> bool ckmin(T &a, V b) {return (b < a)? a = b, true : false;} template<typename T, typename V> bool ckmax(T &a, V b) {return (b > a)? a = b, true : false;} void print(int x) {cout << x;} void print(long long x) {cout << x;} void print(unsigned x) {cout << x;} void print(unsigned long long x) {cout << x;} void print(double x) {cout << fixed << x;} void print(long double x) {cout << fixed << x;} void print(char x) {cout << "'" << x << "'";} void print(string x) {cout << '"' << x << '"';} void print(bool x) {cout << (x ? "true" : "false");} template<typename T, typename V> void print(const pair<T, V> &x) {cout << '{'; print(x.ff); cout << ", "; print(x.ss); cout << '}';} template<typename T> void print(const T &x) {int f = 0; cout << '{'; for (auto &i: x) cout << (f++ ? ", " : ""), print(i); cout << "}";} void _print() {cout << "]" << endl;} template <typename T, typename... V> void _print(T t, V... v) {print(t); if (sizeof...(v)) cout << ", "; _print(v...);} #ifdef TAP #define bug(x...) cout << "[" << #x << "] = ["; _print(x) #else #define bug(x...) #endif struct cht { struct line { ll a, b; line(ll a, ll b):a(a), b(b){} ll intersect(line o) { ll x = o.b - b; ll y = a - o.a; return (x+y-1)/y; } ll val(ll x) { return a*x + b; } }; vt<pair<pair<line, ll>, int> > dq; void insert(ll a, ll b, int pos) { line newline(a, b); while(!dq.empty() && dq.back().ff.ss >= dq.back().ff.ff.intersect(newline)) { dq.pop_back(); } if (dq.empty()) { dq.pb({{newline, 0}, pos}); }else dq.pb({{newline, dq.back().ff.ff.intersect(newline)}, pos}); } ll query2(ll x) { int pos = lower_bound(all(dq), mp(mp(line(0, 0), x), 0), [=](pair<pair<line, ll>, int> a, pair<pair<line, ll>, int> b) { return a.ff.ss < b.ff.ss; }) - dq.begin(); if (pos != 0) --pos; return dq[pos].ff.ff.val(x); } }; const int maxN = 100008; ll s[maxN], f[maxN], v[maxN]; vt<pi(int, ll)> ke[maxN], ans; cht lines; int par[maxN]; ll dispar[maxN]; void dfs(int u, ll d = 0, int p = 0) { if (u != 1) { f[u] = lines.query2(v[u])+d*v[u]+s[u]; } lines.insert(-d, f[u], u); trav(v, ke[u]) { if (v.ff == p) continue; par[u] = p; dispar[v.ff] = v.ss; dfs(v.ff, d+v.ss, u); int sth = u; ll d2 = d; vt<array<ll, 3> > temp; while (lines.dq.back().ss != sth && sth != 1) { temp.pb({-d2, f[sth], sth}); d2 -= dispar[sth]; sth = par[sth]; } reverse(all(temp)); trav(c, temp) { lines.insert(c[0], c[1], c[2]); } } while (lines.dq.back().ss == u) lines.dq.pop_back(); } int main() { #ifndef TAP setIO(""); //setIOusaco("harbingers"); #endif fast; int n; cin >> n; fto(i, 1, n-1) { int u, v, w; cin >> u >> v >> w; ke[u].eb(v, w); ke[v].eb(u, w); } fto(i, 1, n) f[i] = LLONG_MAX; f[1] = 0; fto(i, 1, n-1) { cin >> s[i+1] >> v[i+1]; } dfs(1); fto(i, 2, n) cout << f[i] << " \n"[i == n]; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

harbingers.cpp: In function 'void setIO(std::string)':
harbingers.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen((s+".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
harbingers.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen((s+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
harbingers.cpp: In function 'void setIOusaco(std::string)':
harbingers.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen((s+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
harbingers.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen((s+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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