Submission #167911

#	Time	Username	Problem	Language	Result	Execution time	Memory
167911		muhi1112	Pismo (COCI18_pismo)	C++17	0 / 70	32 ms	17528 KiB

pismo

#include <bits/stdc++.h>
using namespace std;
 
#define endl '\n'
#define f1 first
#define s2 second
#define pb push_back
#define mp make_pair
#define ll long long
#define fri(a) freopen(a,"r",stdin);
#define fro(a) freopen(a,"w",stdout);
const int N=100005;
const int INF=INT_MAX;

int n,dizi[N],maxst[N][21],tleft[N],tright[N],ans=INF;
stack<int>st1;

void build(){
	for(int j=1;j<21;j++){
		for(int i=0;i+(1<<j)<N;i++){
			maxst[i][j]=max(maxst[i][j-1],maxst[i+(1<<(j-1))][j-1]);
		}
	}
}
int qmax(int l,int r){
	int j=log2(r-l+1);
	return max(maxst[l][j],maxst[r-(1<<j)+1][j]);
}
void prepro(){
	for(int i=0;i<=n;i++){
		while(!st1.empty() && dizi[i]<=dizi[st1.top()]){
			st1.pop();
		}
		tleft[i]=st1.top()+1;
		st1.push(i);
	}
	while(!st1.empty()){
		st1.pop();
	}
	for(int i=n+1;i>0;i--){
		while(!st1.empty() && dizi[i]<=dizi[st1.top()]){
			st1.pop();
		}
		tright[i]=st1.top()-1;
		st1.push(i);
	}
}

int solve(){
	for(int i=1;i<=n;i++){
		//cout<<tright[i]<<" "<<tleft[i]<<" "<<qmax(tright[i],tleft[i])<<endl;
		ans=min(ans,tright[i]-tleft[i]>0?qmax(tleft[i],tright[i])-dizi[i]:INF);
	}
	return ans;
}
int main(){
	fri("in.txt");
	fro("out.txt");
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>dizi[i];
		maxst[i][0]=dizi[i];
	}
	build();
	//cout<<qmax(2,2);
	prepro();
	//cout<<tleft[5]<<" "<<tright[5]<<endl;
	cout<<solve()<<endl;

return 0;
}

Compilation message (stderr)

pismo.cpp: In function 'int main()':
pismo.cpp:10:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 #define fri(a) freopen(a,"r",stdin);
                ~~~~~~~^~~~~~~~~~~~~
pismo.cpp:57:2: note: in expansion of macro 'fri'
  fri("in.txt");
  ^~~
pismo.cpp:11:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 #define fro(a) freopen(a,"w",stdout);
                ~~~~~~~^~~~~~~~~~~~~~
pismo.cpp:58:2: note: in expansion of macro 'fro'
  fro("out.txt");
  ^~~

• Subtask 1: 0 / 70