Submission #6547509

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
inline void rd(int &x){
  int k, m=0;
  x=0;
  for(;;){
    k = getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
inline void wt_L(char a){
  putchar_unlocked(a);
}
inline void wt_L(long long x){
  char f[20];
  int m=0, s=0;
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    putchar_unlocked('-');
  }
  while(s--){
    putchar_unlocked(f[s]+'0');
  }
}
int N;
long long L[87] = {2,1};
int main(){
  int i;
  rd(N);
  for(i=2;i<N+1;i++){
    L[i] = L[i-1] + L[i-2];
  }
  wt_L(L[N]);
  wt_L('\n');
  return 0;
}
// cLay varsion 20190721-1

// --- original code ---
// int N;
// ll L[87] = {2,1};
// {
//   int i;
//   rd(N);
//   rep(i,2,N+1) L[i] = L[i-1] + L[i-2];
//   wt(L[N]);
// }

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