Submission #586305

#	Time	Username	Problem	Language	Result	Execution time	Memory
586305		M_W	Safety (NOI18_safety)	C++17	100 / 100	62 ms	5500 KiB

safety

#include <bits/stdc++.h>
using namespace std;
priority_queue<long long> lo;
priority_queue<long long, vector<long long>, greater<long long>> hi;
int main(){
	int N; long long H, x, ymin = 0, shift = 0;
	scanf("%d %lld %lld", &N, &H, &x);
	lo.push(x); hi.push(x);
	for(int i = 1; i < N; i++){
		scanf("%lld", &x);
		
		shift += H;
		long long left = lo.top() - shift, right = hi.top() + shift;
		if(x <= left){
			hi.push(left - shift);
			lo.pop();
			
			lo.push(x + shift);
			lo.push(x + shift);
			ymin += left - x;
		}
		else if(x >= right){
			lo.push(right + shift);
			hi.pop();
			
			hi.push(x - shift);
			hi.push(x - shift);
			ymin += x - right;
		}
		else{
			lo.push(x + shift);
			hi.push(x - shift);
		}
	}
	printf("%lld", ymin);
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:7:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |  scanf("%d %lld %lld", &N, &H, &x);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
safety.cpp:10:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |   scanf("%lld", &x);
      |   ~~~~~^~~~~~~~~~~~

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