Submission #38237

#	Time	Username	Problem	Language	Result	Execution time	Memory
38237		mirbek01	Money (IZhO17_money)	C++14	100 / 100	949 ms	21548 KiB

money

# include <bits/stdc++.h>

# define pb push_back
# define fr first
# define sc second
# define mk make_pair

using namespace std;

const long long linf = 1e18 + 7;
const int inf = 1e9 + 7;
const int N = 1e6 + 5;

typedef long long ll;

int n, a[N], t[N * 4], ans = 1;

void update(int pos, int v = 1, int tl = 1, int tr = N - 1){
      if(tl == tr)
            t[v] ++;
      else{
            int tm = (tl + tr) >> 1;
            if(pos <= tm)
                  update(pos, v << 1, tl, tm);
            else
                  update(pos, (v << 1) | 1, tm + 1, tr);
            t[v] = t[v << 1] + t[(v << 1) | 1];
      }
}

int get(int l, int r, int v = 1, int tl = 1, int tr = N - 1){
      if(l > tr || tl > r) return 0;
      if(l <= tl && tr <= r) return t[v];
      int tm = (tl + tr) >> 1;
      return get(l, r, v << 1, tl, tm) +
                  get(l, r, (v << 1) | 1, tm + 1, tr);
}

int main(){
      scanf("%d", &n);

      for(int i = 1; i <= n; i ++)
            scanf("%d", &a[i]);
      int f = 1;

      for(int i = 2; i <= n; i ++){
            if(a[i] < a[i - 1]){
                  ans ++;
                  while(f + 1 <= i)
                        update(a[f ++]);

            }
            else {
                  int sum = get(a[f] + 1, a[i] - 1);
//                  cout << a[f + 1] + 1 << " " << a[i] - 1 << " " << sum << endl;
                  if(sum){
                        ans ++;
                        while(f + 1 <= i)
                              update(a[f ++]);
                  }
            }
      }

      cout << ans << endl;
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:40:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &n);
                      ^
money.cpp:43:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &a[i]);
                               ^

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55