Submission #36681588

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Source Code Expand

#include <bits/stdc++.h>
#define st first
#define nd second
#define db double
#define re register
#define pb push_back
#define mk make_pair
#define int long long
#define ldb long double
#define pii pair<int, int>
#define ull unsigned long long
#define mst(a, b) memset(a, b, sizeof(a))
using namespace std;
const int N = 2e5 + 10, INF = 2e9;
inline int read()
{
  int s = 0, w = 1;
  char ch = getchar();
  while(ch < '0' || ch > '9') { if(ch == '-') w *= -1; ch = getchar(); }
  while(ch >= '0' && ch <= '9') s = s * 10 + ch - '0', ch = getchar();
  return s * w;
}
int n, c, ans, a[N];
vector<int> op;
inline int f(int x)
{
  int res = a[x];
  for(re int x : op) res = 2 * x - res;
  return res;
}
signed main()
{
 // freopen("data.in", "r", stdin);
 // freopen("sol.out", "w", stdout);
  n = read(), ans = INF;
  for(re int i = 1; i <= n; i++) a[i] = read();
  c = a[n] - a[1];
  for(re int t = 1; t <= 1e3; t++){
    if(t & 1){
      int l = 1, r = n, mx = f(n);
      int x = (mx + 1) / 2, res;
      while(l <= r){
        int mid = (l + r) >> 1, v = f(mid);
        if(v >= x) res = v, r = mid - 1;
        else l = mid + 1;
      }
      ans = min(ans, c + 2 * res - mx), op.pb(res);
    }
    else{
      int l = 1, r = n, mx = f(1);
      int x = (mx + 1) / 2, res;
      while(l <= r){
        int mid = (l + r) >> 1, v = f(mid);
        if(v >= x) res = v, l = mid + 1;
        else r = mid - 1;
      }
      ans = min(ans, c + 2 * res - mx), op.pb(res);
    }
  }
  printf("%lld\n", ans);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘long long int f(long long int)’:
./Main.cpp:28:14: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   28 |   for(re int x : op) res = 2 * x - res;
      |              ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:36:14: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   36 |   for(re int i = 1; i <= n; i++) a[i] = read();
      |              ^
./Main.cpp:38:14: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   38 |   for(re int t = 1; t <= 1e3; t++){
      |              ^

Judge Result