Submission #200203

#	Time	Username	Problem	Language	Result	Execution time	Memory
200203		wilwxk	Safety (NOI18_safety)	C++14	5 / 100	63 ms	6008 KiB

safety

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int MAXN = 2e5+5;
int v[MAXN];
ll pre[MAXN], pos[MAXN];
int n, x;

int main() {
	scanf("%d %d", &n, &x);
	for(int i = 1; i <= n; i++) scanf("%d", &v[i]);
	sort(v+1, v+1+n);

	for(int i = 1; i <= n; i++) pre[i] = pre[i-1]+v[i];
	for(int i = n; i >= 1; i--) pos[i] = pos[i+1]+v[i];

	ll ans = 1e18;
	for(int i = 1; i <= n; i++) {
		ll val = v[i]*ll(i-1);
		val -= pre[i-1];
		val += pos[i+1];
		val -= v[i]*ll(n-i);
		ans = min(ans, val);
	}

	printf("%lld\n", ans);
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &x);
  ~~~~~^~~~~~~~~~~~~~~~~
safety.cpp:12:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= n; i++) scanf("%d", &v[i]);
                              ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 5 / 5
• Subtask 5: 0 / 6
• Subtask 6: 0 / 11
• Subtask 7: 0 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29