Submission #427550

#	Time	Username	Problem	Language	Result	Execution time	Memory
427550		chirathnirodha	Race (IOI11_race)	C++17	0 / 100	48 ms	70724 KiB

race

//Coded by Chirath Nirodha
#include "race.h"
#include<bits/stdc++.h>
using namespace std;
#define MP make_pair
#define PB push_back
#define F first
#define S second
#define P push
typedef long long ll;

map<int,int> mp[1000000];
vector<pair<int,int> > adj[1000000];
int ans=10000010;
int kk;
void dfs(int x,int y){
  for(int i=0;i<adj[y].size();i++){
    int to=adj[y][i].F;
    int len=adj[y][i].S;
    if(to==x)continue;
    dfs(y,to);
    for(auto itr=mp[to].begin();itr!=mp[to].end();itr++){
       pair<int,int> p=*itr;
       if(p.F+len==kk)ans=min(ans,p.S+1);
       else if(mp[y][kk-(p.F+len)]!=0)ans=min(ans,p.S+1+mp[y][kk-(p.F+len)]);
    }
    if(len<=kk)mp[y][len]=1;
    if(len==kk)ans=1;
    for(auto itr=mp[to].begin();itr!=mp[to].end();itr++){
       pair<int,int> p=*itr;
       if(p.F+len>kk)continue;
       if(mp[y][p.F+len]==0)mp[y][p.F+len]=p.S+1;
       else mp[y][p.F+len]=min(mp[y][p.F+len],p.S+1);
    }
    mp[to].clear();
  }
}
int best_path(int n, int K, int h[][2], int l[]){
    kk=K;
    for(int i=0;i<n-1;i++){
      adj[h[i][0]].PB(MP(h[i][1],l[i]));
      adj[h[i][1]].PB(MP(h[i][0],l[i]));
    }
    dfs(0,0);
    if(ans>=n)return -1;
    return ans;
}

Compilation message (stderr)

race.cpp: In function 'void dfs(int, int)':
race.cpp:17:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for(int i=0;i<adj[y].size();i++){
      |               ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57