Submission #1112877

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112877		duyhoanho	Real Mountains (CCO23_day1problem2)	C++17	0 / 25	1 ms	336 KiB

Main

#include<bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define fi first
#define se second
using namespace std;
const int N = 5e3 + 10 ,M = 1e6 + 3;
int n , h[N];
int peak,ans,cnt[N] , sum[N];
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    #define task "task"
    if(fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    if(fopen("task.inp","r"))
    {
        freopen("task.inp","r",stdin);
        freopen("task.out","w",stdout);
    }

  cin >> n;
  for(int i = 1; i <=n;i++) sum[i] = i + sum[i - 1];
  for(int i = 1; i <= n; i++) cin >> h[i] , cnt[h[i]]++;
  for(int i = 1; i < n;i++){
    if(h[i + 1] > h[i]){
      peak = i;
      break;
    }
  }
  if(peak == 0) peak = n;
  int l = peak;
  int r = peak;
  while(true){
    while(h[l] <= h[peak] && l > 0) l--;
    while(h[r] <= h[peak] && r <= n) r++;
    if(l == 0 || r == n + 1){
      cout<<ans;
      return 0;
    }
    int tmp = min(h[l] , h[r]);
    ans = (ans + (tmp - h[peak]) * (h[l] + h[r]) * cnt[h[peak]]) % M;
    ans = (ans + (sum[tmp - 1] - sum[h[peak] - 1]) * cnt[h[peak]]) % M;
    if(h[l] <= h[r]) cnt[h[l]]+=cnt[h[peak]];
    else cnt[h[r]]+=cnt[h[peak]];
    h[peak] = tmp;
  }

}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("task.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("task.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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