Submission #1128277

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128277		ntdaccode	Seesaw (JOI22_seesaw)	C++20	67 / 100	314 ms	118256 KiB

seesaw

#include<bits/stdc++.h>
#define fori(i,a,b) for(int i=a;i<=b;i++)
#define pb push_back

using namespace std;

typedef pair<int,int> ii;
typedef tuple<int,int,int> tp;

const int M = 1e6 + 10;
const int N = 5e3 + 10;
const int mod = 1e9 + 7;

int n, a[N], R[N];
double f[N][N];

int32_t main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);

  if(fopen("1.inp","r")) {
    freopen("1.inp","r",stdin);
    freopen("1.out","w",stdout);
  }

  #define task ""
  if(fopen(task".inp","r")) {
    freopen(task".inp","r",stdin);
    freopen(task".out","w",stdout);
  }

  cin >> n ;
  for(int i = 1;i <= n; i++) cin >> a[i];

  double sum = 0;
  multiset<pair<double,int> > s;

  for(int i =  1;i <= n; i++) {
    for(int j = i;j != 0; j--) {
      sum += a[j];
      f[j][i] = sum/(i - j + 1);
    }
    double val = sum / i;
    s.insert({val, i});
    R[i] = i;
    sum = 0;
  }

  double kq = 1e15;
  while(true) {
    double lval, rval;
    int len;
    tie(lval, len) = *s.begin();
    rval = prev(s.end()) -> first;
    s.erase(s.begin());

    kq = min(kq, rval - lval);
    R[len]++;
    if(R[len] == n + 1) break;
    else s.insert({f[R[len] - len + 1][R[len]], len});
  }

  cout << fixed << setprecision(12) << kq;
}

Compilation message (stderr)

seesaw.cpp: In function 'int32_t main()':
seesaw.cpp:24:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     freopen("1.inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~
seesaw.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     freopen("1.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
seesaw.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
seesaw.cpp:31:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |     freopen(task".out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 33 / 33
• Subtask 3: 33 / 33
• Subtask 4: 0 / 33