Submission #950257

#	Time	Username	Problem	Language	Result	Execution time	Memory
950257		shenfe1	Remittance (JOI19_remittance)	C++17	15 / 100	838 ms	4700 KiB

remittance

#include <bits/stdc++.h>
 
#pragma optimize("Ofast,unroll-loops")
#pragma target("avx2")
 
using namespace std;
 
#define ll long long
#define ld long double
#define pb push_back
#define pf push_front
#define pii pair<int,int>
#define all(v) v.begin(),v.end()
#define F first
#define S second
#define mem(a,i) memset(a,i,sizeof(a))
#define sz(s) (int)s.size()
#define y1 yy
#define ppb pop_back
#define lb lower_bound
#define ub upper_bound
#define gcd(a,b) __gcd(a,b)
#define in insert
#define int ll
 
const int MAX=2e5+10;
const int B=500;
const int maxB=1000;
const int N=104;
const int block=450;
const int inf=2e9;  
const int mod=1e9+7;
const int mod1=1e9+9;
const ld eps=1e-9;
 
int dx[8]={1,0,-1,0,1,-1,-1,1};
int dy[8]={0,1,0,-1,1,-1,1,-1};
 
int binpow(int a,int n){
  if(!n)return 1;
  if(n%2==1)return a*binpow(a,n-1)%mod;
  int k=binpow(a,n/2);
  return k*k%mod;
}
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
int n;
int a[MAX],b[MAX];
 
int r(int i){
  return i%n+1;
}
 
int bit(int i,int j){
  return (i>>j)&1;
}
 
int p[MAX],c[MAX];
int sum=0;
bool ok=0;
 
bool check(){
  int na[10];
  int cc[10];
  int f=0,cnt=0;
  for(int i=1;i<=n;i++)na[i]=a[i],cc[i]=c[i],cnt+=c[i];
  while(f<=sum&&cnt>=0){
    for(int i=1;i<=n;i++){
      while(cc[i]&&na[i]>=2){
        na[i]-=2;
        na[r(i)]++;
        cnt--;
        cc[i]--;
      }
    }
    f++;
  }
  bool ok=1;
  for(int i=1;i<=n;i++){
    if(na[i]!=b[i])ok=0;
  }
  if(ok)return 1;
  return 0;
}
 
void calc(int i){
  if(i==n+1){
    ok|=check();
    return;
  }
  c[i]=0;
  for(c[i]=0;c[i]<=7;c[i]++){
    calc(i+1);
  }
}
 
void solve(){
  cin>>n;
  for(int i=1;i<=n;i++){
    cin>>a[i]>>b[i];
    sum+=a[i]-b[i];
  }
  if(sum<0){
    cout<<"No"<<"\n";
    return;
  }
  calc(1);
  if(ok){
    cout<<"Yes\n";
    return;
  }
  cout<<"No\n";
}
 
signed main(){
  // freopen("triangles.in","r",stdin);
  // freopen("triangles.out","w",stdout);
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  // prec();
  int t=1;
  // cin>>t;
  while(t--){
    solve();
  }
}

Compilation message (stderr)

remittance.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    3 | #pragma optimize("Ofast,unroll-loops")
      | 
remittance.cpp:4: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    4 | #pragma target("avx2")
      |

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