#include<iostream>
#include<algorithm>
#define rep(a,b) for(int a=0; a<(b); ++a)
#define nl "\n"
using namespace std;
int n, in[1000007], l=0, r=0;
int main()
{
cin>>n;
rep(i,n){
int buf;
cin>>buf;
in[buf]=i;
}
/*rep(i,n+1){
clog<<in[i]<<" ";
}*/
l=in[n];
r=in[n];
clog<<nl;
long long res=0;
int med=2*n;
for(int i=1; i<n+1; ++i){
//clog<<med<<nl;
if(med%2){
l=min(l,in[med/2]);
r=max(r,in[med/2]);
}
else{
l=min(l,in[med/2]);
r=max(r,in[med/2+1]);
}
int window=i-r+l-1;
if(window>=0){
int l_s=max(0,l-window);
int r_s=min(n-1,r+window);
//clog<<l_s<<" "<<r_s<<nl;
res+=r_s-l_s+2-i;
}
/*if(window==0){
clog<<1<<nl;
}*/
--med;
}
cout<<2*n+1<<" "<<res<<nl;
//clog<<nl;
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 42 43 44 45 46 47 48 49 50 51 52 | #include<iostream> #include<algorithm> #define rep(a,b) for(int a=0; a<(b); ++a) #define nl "\n" using namespace std; int n, in[1000007], l=0, r=0; int main() { cin>>n; rep(i,n){ int buf; cin>>buf; in[buf]=i; } /*rep(i,n+1){ clog<<in[i]<<" "; }*/ l=in[n]; r=in[n]; clog<<nl; long long res=0; int med=2*n; for(int i=1; i<n+1; ++i){ //clog<<med<<nl; if(med%2){ l=min(l,in[med/2]); r=max(r,in[med/2]); } else{ l=min(l,in[med/2]); r=max(r,in[med/2+1]); } int window=i-r+l-1; if(window>=0){ int l_s=max(0,l-window); int r_s=min(n-1,r+window); //clog<<l_s<<" "<<r_s<<nl; res+=r_s-l_s+2-i; } /*if(window==0){ clog<<1<<nl; }*/ --med; } cout<<2*n+1<<" "<<res<<nl; //clog<<nl; return 0; } |
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