Submission #272739

#	Time	Username	Problem	Language	Result	Execution time	Memory
272739		kimbj0709	Strange Device (APIO19_strange_device)	C++14	100 / 100	617 ms	53440 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#define int long long
int mx = 1000000000000000000;
#define f first
#define s second
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);cout.tie(0);
  int n,a,b;
  int input1,input2;
  cin >> n >> a >> b;
  int c = a/(__gcd(a,b+1));
  if(c>(mx+b-1)/b){
    mx = mx+1;
  }
  else{
    mx = c*b;
  }
  vector<pair<int,int> > vect1;
  for(int i=0;i<n;i++){
    cin >> input1 >> input2;
    if(input2-input1+1>=mx){
      cout << mx;
      return 0;
    }
    input1 %= mx;
    input2 %= mx;
    if(input1>input2){
      vect1.push_back({0,input2});
      vect1.push_back({input1,mx-1});
    }
    else{
      vect1.push_back({input1,input2});
    }
  }
  sort(vect1.begin(),vect1.end());
  int ans = 0;
  int currpos = -1;
  for(int i=0;i<vect1.size();i++){
    if(vect1[i].f>currpos){
      ans += vect1[i].s-vect1[i].f+1;
      currpos = vect1[i].s;
    }
    else if(vect1[i].s>currpos){
      ans += vect1[i].s-currpos;
      currpos = vect1[i].s;
    }
  }
  cout << ans;
}

Compilation message (stderr)

strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:40:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |   for(int i=0;i<vect1.size();i++){
      |               ~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 30 / 30