Submission #122491

#	Time	Username	Problem	Language	Result	Execution time	Memory
122491		kimbj0709	Walking (NOI12_walking)	C++17	25 / 25	3 ms	512 KiB

walking

#include <bits/stdc++.h>
using namespace std;
int length;
bool can(int a,int b,int c,int d){
  //pos1,val,pos2,val
  return (long double)(a+((long double)(length)/(long double)b))>(long double)(c+((long double)(length)/(long double)d));
}


int main() {
  int no_of_input;
  int input1,input2;
  vector<pair<int,int> > vect1;
  cin >> length >> no_of_input;
  for(int i=0;i<no_of_input;i++){
    cin >> input1 >> input2;
    vect1.push_back({input1,input2});
  }
  sort(vect1.begin(),vect1.end());
  vector<int> dp(no_of_input,1);
  for(int i=0;i<no_of_input;i++){
    for(int j=i+1;j<no_of_input;j++){
      if(vect1[i].first<vect1[j].first){
        if(can(vect1[i].first,vect1[i].second,vect1[j].first,vect1[j].second)==true){
          //cout << i << " " << j << "\n";
          //cout << vect1[i].first << " "<< vect1[j].first << "\n";
          dp[j]= max(dp[j],dp[i]+1);
        } 
      }
      
    }
  }
  int maxx = 0;
  for(int i=0;i<dp.size();i++){
    //cout << dp[i] << " ";
    maxx = max(maxx,dp[i]);
  }
  //cout << "\n";
  cout << maxx;
}

Compilation message (stderr)

walking.cpp: In function 'int main()':
walking.cpp:34:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<dp.size();i++){
               ~^~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 3 / 3
• Subtask 3: 5 / 5
• Subtask 4: 7 / 7
• Subtask 5: 7 / 7