Submission #877897

#	Time	Username	Problem	Language	Result	Execution time	Memory
877897		raul2008487	Race (IOI11_race)	C++17	Compilation error	0 ms	0 KiB

race

#include<bits/stdc++.h>
#include "race.h"
#define ll long long
#define pb push_back
#define eb emplace_back
#define vl vector<ll>
#define fi first
#define se second
#define in insert
#define mpr make_pair
#define lg(x) __lg(x)
#define bpc(x) __builtin_popcount(x)
#define all(v) v.begin(), v.end()
#define endl "\n"
using namespace std;
const int sz = 2e5+5;
const ll inf = 1000000000000000;
bool used[sz];
vector<pair<ll,ll>> arr, adj[sz];
ll n, k, ss[sz], res = inf;
map<ll,ll> mp;
void construct(ll node, ll p){
    ss[node] = 1;
    for(pair<ll,ll> edge: adj[node]){
        if(!used[edge.fi] && edge.fi != p){
            construct(edge.fi, node);
            ss[node] += ss[edge.fi];
        }
    }
}
ll centroid(ll v, ll p, ll cs){
    for(pair<ll,ll> edge: adj[v]){
        if(edge.fi == p || used[edge.fi]){continue;}
        if(ss[edge.fi] > (cs>>1)){
            return centroid(edge.fi, v, cs);
        }
    }
    return v;
}
void init(ll v, ll p, ll w, ll we){
    if(mp.find(k - w) != mp.end()){
        res = min(res, mp[k-w] + we);
    }
    arr.pb({w, we});
    for(pair<ll,ll> edge: adj[v]){
        if(used[v] || edge.fi == p){continue;}
        init(edge.fi, v, w + edge.se, we + 1);
    }
}
void calc(ll node){
    mp.clear();
    construct(node, -1);
    ll c = centroid(node, -1, ss[node]);
    mp[0] = 0;
    for(pair<ll,ll> edge: adj[c]){
        if(used[edge.fi]){continue;}
        arr.clear();
        init(edge.fi, c, edge.se, 1);
        for(pair<ll,ll> y: arr){
            if(mp.find(y.fi) == mp.end()){
                mp[y.fi] = y.se;
            }
            else{
                mp[y.fi] = min(mp[y.fi], y.se);
            }
        }
    }
    used[c] = 1;
    for(pair<ll,ll> edge: adj[c]){
        if(!used[edge.fi]){
            calc(edge.fi);
        }
    }
}
int best_path(int N, int K, int H[][2], int L[])
{
    n = N;
    k = K;
    for(i=0;i<n-1;i++){
        adj[H[i][0]].pb({H[i][1], L[i]});
        adj[H[i][1]].pb({H[i][0], L[i]});
    }
    calc(0);
    if(res == inf){
        return -1;
    }
    return res;
}

Compilation message (stderr)

race.cpp: In function 'int best_path(int, int, int (*)[2], int*)':
race.cpp:79:9: error: 'i' was not declared in this scope
   79 |     for(i=0;i<n-1;i++){
      |         ^