Submission #329140

#	Time	Username	Problem	Language	Result	Execution time	Memory
329140		oak	Mountains (NOI20_mountains)	C++14	64 / 100	2084 ms	3244 KiB

Mountains

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,j,i;
	scanf("%d",&n);
	long long arr[n],sum[n];
	multiset<long long> ms;
	for(i=0;i<n;i++){
		scanf("%lld",&arr[i]);
		ms.insert(arr[i]);
		sum[i] = distance(ms.begin(),ms.lower_bound(arr[i]));
		//printf("%d ",sum[i]);
	}
	//printf("\n");
	long long ans = 0;
	ms.clear();
	for(i=n-1;i>=0;i--){
		ms.insert(arr[i]);
		sum[i] *= distance(ms.begin(),ms.lower_bound(arr[i]));
		ans += sum[i]*1ll;
		//printf("%d ",sum[i]);
	}
	//printf("\n");
	printf("%lld",ans);
}

Compilation message (stderr)

Mountains.cpp: In function 'int main()':
Mountains.cpp:4:8: warning: unused variable 'j' [-Wunused-variable]
    4 |  int n,j,i;
      |        ^
Mountains.cpp:5:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
Mountains.cpp:9:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |   scanf("%lld",&arr[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 36 / 36
• Subtask 5: 28 / 28
• Subtask 6: 0 / 9
• Subtask 7: 0 / 12