Submission #770136

#	Time	Username	Problem	Language	Result	Execution time	Memory
770136		MarwenElarbi	Paths (RMI21_paths)	C++17	0 / 100	4 ms	5076 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define vi vector<int>
#define ve vector
#define ll long long
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define onbit __builtin_popcount
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e18
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
using namespace std;
using namespace __gnu_pbds;
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const ll MOD = 1e9+9;
const int nax = 2e5+5;
const int MAX_VAL = 1e6;
double PI=3.14159265359;
int arx[8]={1,1,0,-1,-1,-1, 0, 1};
int ary[8]={0,1,1, 1, 0,-1,-1,-1};
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
int tin[nax];
int tout[nax];
int timer=-1;
vector<pair<int,ll>> adj[nax];
ll res=0;
ll tab[nax];
ll segtree[nax*4];
ll lazy[nax*4];
int n,k;
void euler(int x,int p)
{
    timer++;
    tin[x]=timer;
    tab[x]=res;
    for(auto u:adj[x])
    {
        if (u.fi==p) continue;
        res+=u.se;
        euler(u.fi,x);
        res-=u.se;
    }
    tout[x]=timer;
}
void build(int pos,int l,int r)
{
    if (l>r) return;
    if (l==r)
    {
        segtree[pos]=tab[r];
        lazy[pos]=0;
        return;
    }
    int mid=(r+l)/2;
    build(pos*2+1,l,mid);
    build(pos*2+2,mid+1,r);
    segtree[pos]=max(segtree[pos*2+1],segtree[pos*2+2]);
}
void push(int pos)
{
    lazy[pos*2+1]+=lazy[pos];
    segtree[pos*2+1]+=lazy[pos];
    lazy[pos*2+2]+=lazy[pos];
    segtree[pos*2+2]+=lazy[pos];
    lazy[pos]=0;
}
void update(int pos,int l,int r,int left,int right,ll value)
{
    if (left>right) return;
    if (l==left&&r==right)
    {
        segtree[pos]+=value;
        lazy[pos]+=value;
        return;
    }
    push(pos);
    int mid=(r+l)/2;
    update(pos*2+1,l,mid, left , min(mid,right) ,value);
    update(pos*2+2,mid+1,r, max(mid+1,left) , right ,value);
    segtree[pos]=max(segtree[pos*2+1],segtree[pos*2+2]);
}
ll sum[nax];
void dfs(int x,int p)
{
    sum[x]=segtree[0];
    for(auto u:adj[x])
    {
        if (u.fi==p) continue;
        //cout <<u.fi<<endl;
        update(0,0,n-1,0,n-1,u.se);
        update(0,0,n-1,tin[u.fi],tout[u.fi],1ll*-2*u.se);
        dfs(u.fi,x);
        update(0,0,n-1,tin[u.fi],tout[u.fi],1ll*2*u.se);
        update(0,0,n-1,0,n-1,-u.se);
    }
}
int main(){
    optimise;
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    //setIO("redistricting");
    cin>>n>>k;
    for (int i = 0; i < n-1; ++i)
    {
        ll x,y,z;
        cin>>x>>y>>z;
        x--;y--;
        adj[x].pb({y,z});
        adj[y].pb({x,z});
    }
    euler(0,-1);
    build(0,0,n-1);
    dfs(0,-1);
    for (int i = 0; i < n; ++i)
    {
        cout << sum[i]<<endl;
    }
}

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:34:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:115:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 12
• Subtask 6: 0 / 32