Submission #1111227

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111227		mychecksedad	Remittance (JOI19_remittance)	C++17	15 / 100	1 ms	508 KiB

remittance

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;
 
 
int n, A[N], B[N], x[N], nx[N], C[N];
void solve(){
  cin >> n;
  ll SA = 0, SB = 0;
  for(int i = 1; i <= n; ++i){
    cin >> A[i] >> B[i];
    x[i] = 0;
    SA += A[i];
    SB += B[i];
  }
  if(SB==0){
    if(SA==0) cout << "Yes";
    else cout << "No";
    return;
  }
  if(SB > SA){
    cout << "No";
    return;
  }
  bool OK = 1;
  for(int bit = 0; bit < 32; bit++){
    OK = 0;
    for(int i = 1; i <= n; ++i){
      ll val = (A[i] % 2) - (B[i] % 2) - x[i];
      int b = i == 1 ? n : i - 1;
      nx[b] = (-val+4)%2;
      
      if(x[b] != nx[b]){
        OK = 1;
      }
    }
    // for(int i = 1; i <= n; ++i){
    //   // cout << nx[i] << ' ';
    //   int b = i == 1 ? n : i - 1;
    //   cout << A[i] << ' ' << x[i] << ' ' << nx[b] << ' ' << B[i] << '\n';
    // }
    // en;
    for(int i = 1; i <= n; ++i){
      int b = i == 1 ? n : i - 1;
      A[i] += nx[b];
      A[i] -= x[i];
      A[i] >>= 1;
      B[i] >>= 1;
      x[i] = nx[i];
      if(A[i]<0){
        cout << "No";
        return;
      }
      // cout << A[i] << ' ' << B[i] << '\n';
      // cout << x[i] << ' ';
    }
  }
  for(int i = 1; i <= n; ++i) if(A[i]!=0 || B[i]!=0) OK=1;
  if(OK){
    cout << "No";
    return;
  }
  cout << "Yes";
}
 
 
int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:80:15: warning: unused variable 'aa' [-Wunused-variable]
   80 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 15 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45