#include <bits/stdc++.h>
using namespace std;
struct prz{
int pocz,kon;
};
prz tp[1000000];
int g[1000000],t[1000000];
int n,x;
long long wyn;
int main()
{
scanf("%d",&n);
for(int i=1;i<=n;i++){
scanf("%d",&t[i]);
g[t[i]]=i;
}
tp[n].pocz=g[n];
tp[n].kon=g[n];
for(int i=n-1;i>0;i--){
tp[i].pocz=min(g[i],tp[i+1].pocz);
tp[i].kon=max(g[i],tp[i+1].kon);
}
for(int i=1;i<=n;i++){
x=i-(i-1)/2;
wyn+=max(0,min(min(min(tp[n-x+1].pocz,n-tp[n-x+1].kon+1),i-(tp[n-x+1].kon-tp[n-x+1].pocz)),n-i+1));
//printf("%d %d %d\n",i,x,wyn);
}
printf("%d %lld",2*n+1,wyn);
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 | #include <bits/stdc++.h> using namespace std; struct prz{ int pocz,kon; }; prz tp[1000000]; int g[1000000],t[1000000]; int n,x; long long wyn; int main() { scanf("%d",&n); for(int i=1;i<=n;i++){ scanf("%d",&t[i]); g[t[i]]=i; } tp[n].pocz=g[n]; tp[n].kon=g[n]; for(int i=n-1;i>0;i--){ tp[i].pocz=min(g[i],tp[i+1].pocz); tp[i].kon=max(g[i],tp[i+1].kon); } for(int i=1;i<=n;i++){ x=i-(i-1)/2; wyn+=max(0,min(min(min(tp[n-x+1].pocz,n-tp[n-x+1].kon+1),i-(tp[n-x+1].kon-tp[n-x+1].pocz)),n-i+1)); //printf("%d %d %d\n",i,x,wyn); } printf("%d %lld",2*n+1,wyn); return 0; } |
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