제출 #17348

#제출 시각아이디문제언어결과실행 시간메모리
17348gs14004등산 경로 (IZhO12_route)C++14
100 / 100
396 ms21940 KiB
#include <cstdio> #include <algorithm> #include <stack> #include <queue> using namespace std; typedef pair<int,int> pi; int n,k,a[1000005]; priority_queue<pi, vector<pi>, greater<pi> > pq; stack<int> s,t; int main(){ scanf("%d %d",&n,&k); for (int i=0; i<n; i++) { scanf("%d",&a[i]); } rotate(a, max_element(a, a+n), a+n); a[n] = a[0]; for (int i=0; i<=n; i++) { if(s.empty() || s.top() >= a[i]){ s.push(a[i]); t.push(i); } else{ while (!s.empty() && s.top() < a[i]) { int ptop = s.top(); s.pop(); t.pop(); pq.push(pi(i - t.top() - 1, min(s.top(), a[i]) - ptop)); // first cost로 t만큼 뽕뽑 } s.push(a[i]); t.push(i); } } int ret = 0; while(!pq.empty()){ pi t = pq.top(); pq.pop(); int change = min(t.second, k / t.first); ret += change * 2; k -= change * t.first; } printf("%d",ret); }
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