Submission #168937

#	Time	Username	Problem	Language	Result	Execution time	Memory
168937		beso123	Money (IZhO17_money)	C++14	100 / 100	1198 ms	62072 KiB

money

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N=1000006;
int n,a[N],fen[N],ans;
set <int> st;
void UPD(int x,int val){
    while(x<=N){
        fen[x]+=val;
        x=x+(x&(-x));
    }
}
int GET(int x){
    int sum=0;
    while(x>=1){
        sum+=fen[x];
        x=x-(x&(-x));
    }
    return sum;
}
int get(int l,int r){
    if(l>r)
        return 0;
    return GET(r)-GET(l-1);
}
main(){
    ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	scanf("%lld",&n);
	for(int k=1;k<=n;k++){
		scanf("%lld",&a[k]);
	}
	int l=1;
	for(int r=1;r<=n+1;r++){
		if(a[r-1]>a[r]){
			ans++;
			for(int j=l;j<=r-1;j++)
				st.insert(a[j]);
                l=r;
			continue;
		}
		auto it=st.upper_bound(a[l]);
		if(it!=st.end() && *it<a[r]){
			ans++;
			for(int j=l;j<=r-1;j++)
				st.insert(a[j]);
                l=r;
		}
	}
	printf("%lld",ans);
return 0;
}

Compilation message (stderr)

money.cpp:26:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
money.cpp: In function 'int main()':
money.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&n);
  ~~~~~^~~~~~~~~~~
money.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&a[k]);
   ~~~~~^~~~~~~~~~~~~~

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