Submission #1063757

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063757		trMatherz	Harbingers (CEOI09_harbingers)	C++17	0 / 100	129 ms	65536 KiB

harbingers

#include <iostream>
 
// #include <fstream>
// std::ifstream cin ("pushabox.in");
// std::ofstream cout ("pushabox.out");
 
// includes
#include <cmath>
#include <set>
#include <map>
#include <queue>
#include <string>
#include <vector>
#include <array>
#include <algorithm>
#include <numeric>
#include <iomanip>
#include <unordered_set>
#include <stack>
#include <ext/pb_ds/assoc_container.hpp>
#include <random>
#include <chrono>
#include <bitset>
#include <complex>
 
// usings
using namespace std;
using namespace __gnu_pbds;
 
// misc
#define ll long long
#define ld long double
#define pb push_back
#define pq priority_queue
#define ub upper_bound
#define lb lower_bound
template <typename T, typename U>
bool emin(T &a, const U &b) { return b < a ? a = b, true : false; }
template <typename T, typename U>
bool emax(T &a, const U &b) { return b > a ? a = b, true : false; }
typedef uint64_t hash_t;
 
// vectors
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vpii vector<pair<int, int>>
#define vvpii vector<vector<pair<int, int>>>
#define vppipi vector<pair<int, pair<int, int>>>
#define vl vector<ll>
#define vvl vector<vl>
#define vvvl vector<vvl>
#define vpll vector<pair<ll, ll>>
#define vvpll vector<vpll>
#define vb vector<bool>
#define vvb vector<vb>
#define vvvb vector<vvb>
#define vs vector<string>
#define sz(x) (int)x.size()
#define rz resize
#define all(x) x.begin(), x.end()
#define vc vector<char>
#define vvc vector<vc>
 
// pairs
#define pii pair<int, int>
#define pll pair<ll, ll>
#define mp make_pair
#define f first
#define s second
 
// sets
#define si set<int>
#define sl set<ll>
#define ss set<string>
#define in insert
template <class T>
using iset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
// maps
#define mii map<int, int>
#define mll map<ll, ll>

// loops
#define FR(x, z, y) for (int x = z; x < y; x++)
#define FRE(x, z, y) FR(x, z, y + 1)
#define F(x, y) FR(x, 0, y)
#define FE(x, y) F(x, y + 1)
#define A(x, y) for (auto &x : y)

ld isect(pll a, pll b) { return (ld) (a.s - b.s) / (b.f - a.f); }
int n; 
vl d, dp; vvpll a; vpll b, c;
int pos = 0; int sz = 1; 
int add(ll k, ll m){ 
    for(int i = sz; i > 1; i--) {
        if(isect(c[i - 1], c[i]) < isect(c[i - 1], {k, m})) return i;
    }
    return 1; 
}
ll get(ll x){
    ll ret = 0; 
    for(int i = 0; i < sz; i++){
        emin(ret, c[i].f * x + c[i].s); 
    }
    return ret; 
}
void dfs(int x, int p){
    int pos, prev = sz; pll past; 
    auto y = c; 
    if(p != -1) {
        dp[x] = b[x].f + b[x].s * d[x] + min(get(b[x].s), 0ll); 
        pos = add(-d[x], dp[x]); 
        past = c[pos];
        c[pos] = { -d[x], dp[x] };
        sz = pos + 1; 
    }
    A(u, a[x]) {
        if(u.f == p) continue; 
        d[u.f] = d[x] + u.s; 
        dfs(u.f, x); 
    }
    if(p != -1) {
        sz = prev; 
        c[pos] = past; 
        c = y; 
    }
}
int main() { 
    cin >> n; 
    a = vvpll(n); 
    b = c = vpll(n, {(ll) 1e9, (ll) 1e9}); 
    c[0] = {0, 0}; 
    d = dp = vl(n, 0); 
    F(i, n - 1){
        ll x, y, z; cin >> x >> y >> z; x--; y--; 
        a[x].pb({y, z}); a[y].pb({x, z}); 
    }
    F(i, n - 1) cin >> b[i + 1].f >> b[i + 1].s; 
    dfs(0, -1); 
    F(i, n - 1) cout << dp[i + 1] << " "; 
}

Compilation message (stderr)

harbingers.cpp: In function 'void dfs(int, int)':
harbingers.cpp:125:14: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
  125 |         c[pos] = past;
      |              ^

• Subtask 1: 0 / 100