#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#ifdef LOCAL
#define debug(...) __VA_ARGS__
#else
#define debug(...) {}
#endif
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int i;
int n;
cin>>n;
cout<<2*n+1<<" ";
int tab[n+1];
int gdzie[n+1];
for (i = 1; i < n+1 ; i++){
cin>>tab[i];
gdzie[tab[i]] = i;
}
int dl = 2;
int l = gdzie[n];
int p = gdzie[n];
ll wy = 1;
for (i = n-1 ; i >= n/2 ; i--){
l = min(l,gdzie[i]);
p = max(p,gdzie[i]);
int dist = dl-(p-l+1);
if (dist >= 0) wy += max(0,min(dist,l-1)-max(0,dist-(n-p))+1);
//cout<<i<<".5 "<<dl<<" "<<wy<<"\n";
dl++;
dist = dl-(p-l+1);
if (dist >= 0) wy += max(0,min(dist,l-1)-max(0,dist-(n-p))+1);
//cout<<i<<" "<<dl<<" "<<wy<<"\n";
dl++;
}
cout<<wy<<"\n";
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | #include <bits/stdc++.h> using namespace std; typedef long long ll; #ifdef LOCAL #define debug(...) __VA_ARGS__ #else #define debug(...) {} #endif int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int i; int n; cin>>n; cout<<2*n+1<<" "; int tab[n+1]; int gdzie[n+1]; for (i = 1; i < n+1 ; i++){ cin>>tab[i]; gdzie[tab[i]] = i; } int dl = 2; int l = gdzie[n]; int p = gdzie[n]; ll wy = 1; for (i = n-1 ; i >= n/2 ; i--){ l = min(l,gdzie[i]); p = max(p,gdzie[i]); int dist = dl-(p-l+1); if (dist >= 0) wy += max(0,min(dist,l-1)-max(0,dist-(n-p))+1); //cout<<i<<".5 "<<dl<<" "<<wy<<"\n"; dl++; dist = dl-(p-l+1); if (dist >= 0) wy += max(0,min(dist,l-1)-max(0,dist-(n-p))+1); //cout<<i<<" "<<dl<<" "<<wy<<"\n"; dl++; } cout<<wy<<"\n"; return 0; } |
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