Submission #1084801

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084801		modwwe	Traffic (IOI10_traffic)	C++17	100 / 100	821 ms	139344 KiB

traffic

#pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>
#include "traffic.h"
#define int2 long long
//#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define NHP     ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".out","w",stdout)
#define pb push_back
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
#define getchar_unlocked getchar
 
inline int scan()
{
    char c = getchar_unlocked();
    int x = 0;
    while(c<'0'||c>'9')
    {
        c=getchar_unlocked();
    }
    while(c>='0'&&c<='9')
    {
        x=(x<<1)+(x<<3)+c-'0';
        c=getchar_unlocked();
    }
    return x;
}
 
void phongbeo();
const int inf=1e9;
const int mod2=998244353;
const int  mod1=998244353;
struct icd
{
    long double a;
    int b;
};
struct ib
{
    int a;
    int b;
};
struct ic
{
    int a,b,c;
};
struct id
{
    int a,b,c,d;
};
struct ie
{
    int a,b,c,d,e;
 
};
 
int2 n,m,s1,s2,s4,s3,sf,k,s5,s6,mx,s7,s8,s9,mx2,res,dem2=0,dem=0,s33,dem3,dem4,l,r,mid,l2,r2,center;
int2  i,s10,s12;
int2 kk;
int2 el=29;
 
vector<int> v[1000001];
 int2 dp[1000001];
 void dfs(int x,int y)
  {
       for(auto f:v[x])
         if(f!=y)
          dfs(f,x),dp[x]+=dp[f];
  }
  void dfs2(int x,int y)
  {int2 s=0;
  int2 ss=0;
       for(auto f:v[x])
       {
            if(f!=y)
            {
                 s=max(s,dp[f]);
            }
       }
       s=max(s,dp[y]-dp[x]);
 if(y!=0)dp[x]=dp[y];
        if(s<s4) s4=s,s5=x;
     for(auto f:v[x])
        if(f!=y)
    dfs2(f,x);
  }
 
int LocateCentre(int n, int pp[], int S[], int D[])
{
    s4=1e18;
     for(int i=1;i<=n;i++)
       dp[i]=pp[i-1];
         for(int i=1;i<n;i++)
         {
              l=S[i-1];
              r=D[i-1];
              l++;
              r++;
              v[l].pb(r);
               v[r].pb(l);
         }
         dfs(1,0);
         dfs2(1,0);
          return s5-1;
}

Compilation message (stderr)

traffic.cpp: In function 'void dfs2(int, int)':
traffic.cpp:79:8: warning: unused variable 'ss' [-Wunused-variable]
   79 |   int2 ss=0;
      |        ^~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 25 / 25