Submission #1113374

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113374		ntdaccode	Real Mountains (CCO23_day1problem2)	C++17	12 / 25	339 ms	113996 KiB

Main

#include<bits/stdc++.h>
#define fori(i,a,b) for(int i = a;i <= b; i++)
#define int long long
#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 = 1e6 + 3;

int n,h[N];
int target[N];
vector<int> Q[N];
vector<int> rrh;
int calc(int l,int r) {
  return ((l + r) * (r - l + 1) / 2) % mod;
}
int add(int a,int b) {
  return (a + b) % mod;
}
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 >> h[i];

  int suf = 0,pre = 0;
  for(int i = 1;i <= n; i++) {
    pre = max(pre, h[i]);
    target[i] =  pre ;
  }
  for(int i = n; i != 0; i--) {
    suf = max(suf, h[i]);
    target[i] = min(target[i], suf);
  }

  for(int i = 1;i <= n; i++) rrh.pb(h[i]);
  sort(rrh.begin(),rrh.end());
  rrh.resize(unique (rrh.begin(), rrh.end()) - rrh.begin());
  for(int i = 1;i <= n; i++) {
      h[i] = lower_bound(rrh.begin(),rrh.end(),h[i]) - rrh.begin() ;
      target[i] = lower_bound(rrh.begin(),rrh.end(),target[i]) - rrh.begin() ;
      //cout << h[i] << " " << target[i] << "\n";
  }

  for(int i = 1;i <= n; i++) {
    if(h[i] != target[i]) {
      Q[h[i]].pb(i);

    }
  }
  int kq = 0;
  int m = rrh.size();
  for(int high = 0;high <= m - 2; high++) {
    int sz = Q[high].size();
    if(sz == 0) continue;
    int val = rrh[high] % mod;
    int nxt_val = rrh[high + 1] % mod;
    if(sz == 1) {

      int x = 1e9 , y = 1e9 , cur = Q[high][0];
      for(int j = 1; j < cur; j++) {
        if(h[j] > h[cur]) x = min(x,rrh[h[j]]);
      }
      for(int j = cur + 1; j <= n ;j++) {
        if(h[j] > h[cur]) y = min(y,rrh[h[j]]);
      }
      x %= mod;
      y %= mod;
      kq = (kq + (nxt_val - val)*(x + y) % mod  ) % mod;
      h[cur]++;
      if(h[cur] != target[cur]) Q[h[cur]].pb(cur);


    }
    else {
      sort(Q[high].begin(),Q[high].end());
      int pre_l = 1e9 , pre_r = 1e9 , suf_l = 1e9 , suf_r = 1e9;
      int l = Q[high][0], r = Q[high].back();
      for(int j = 1;j < l ; j++) {
        if(h[j] > h[l]) pre_l = min(pre_l,rrh[h[j]]);
      }
      for(int j = l + 1;j <= n; j++) {
        if(h[j] > h[l]) suf_l = min(suf_l,rrh[h[j]]);
      }
      for(int j = 1; j < r; j++) {
        if(h[j] > h[r]) pre_r = min(pre_r,rrh[h[j]]);
      }
      for(int j = r + 1;j <= n; j++) {
        if(h[j] > h[r]) suf_r = min(suf_r,rrh[h[j]]);
      }

//      cout << Q[high].size() << " " << pre_l << " " << suf_l << " " << pre_r << " " << suf_r << "\n";
//      cout << val << " " << nxt_val << " ";
//      cout << calc(val,nxt_val - 1) << " ";
//      cout << calc(val + 1,nxt_val) << "\n";

      int x =(rrh[high + 1] - rrh[high]) * add(pre_l,suf_l) + (rrh[high + 1] - rrh[high]) * suf_r ;
      int y =(rrh[high + 1] - rrh[high]) * add(pre_r,suf_r) + (rrh[high + 1] - rrh[high]) * pre_l ;
      //cout << x  <<  " " << y << "a\n";
      x = min(x,y) % mod;
      kq = (kq + x) % mod;
      //cout << kq << "a\n";
      kq = ( kq + (sz - 2) * 2ll * calc(val + 1 ,nxt_val) % mod + calc(val + 1,nxt_val)) % mod;
      for(int idx : Q[high]) {
          h[idx]++;
          if(h[idx] != target[idx]) Q[h[idx]].pb(idx);
      }
    }

    kq = (kq + sz * calc(val,nxt_val - 1) % mod) % mod;
    //cout << val << " " << nxt_val << " " << sz * calc(val,nxt_val - 1) << " " <<  kq << '\n';
  }
  cout << kq % mod;
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.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("1.inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen("1.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen(task".out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 3 / 3
• Subtask 3: 3 / 3
• Subtask 4: 3 / 3
• Subtask 5: 0 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 4