#include<bits/stdc++.h>
#define pb push_back
using namespace std;
typedef long long lld;
constexpr int MAX_N = 1000000;
int t[MAX_N+9], poz[MAX_N+9];
int main() {
int n;
scanf("%d", &n);
for(int i = 1; i <= n; ++i) {
scanf("%d", &t[i]);
poz[t[i]] = i;
}
int l = n;
int r = 1;
lld wyn = 0;
for(int i = n; i >= 1; --i) {
l = min(l, poz[i]);
r = max(r, poz[i]);
int ll = 0;
int rr = 0;
int spots = (n-i)*2+1 - (r - l + 1);
if(poz[i-1] < l) {
ll = l - poz[i-1] - 1;
rr = n - r;
}
else if(r < poz[i-1]) {
ll = l-1;
rr = poz[i-1] - r - 1;
}
else {
spots = -1;
}
ll = min(ll, spots);
rr = min(rr, spots);
if(ll > rr) {
swap(ll, rr);
}
//lld old_wyn = wyn;
for(int j = 0; j <= ll; ++j) {
wyn += min(rr, spots-j)+1;
}
//printf("%d: %lld\n", i, wyn-old_wyn);
}
printf("%d %lld\n", n*2+1, wyn);
}
/*
5
1 4 3 5 2
//*/
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 53 54 55 56 | #include<bits/stdc++.h> #define pb push_back using namespace std; typedef long long lld; constexpr int MAX_N = 1000000; int t[MAX_N+9], poz[MAX_N+9]; int main() { int n; scanf("%d", &n); for(int i = 1; i <= n; ++i) { scanf("%d", &t[i]); poz[t[i]] = i; } int l = n; int r = 1; lld wyn = 0; for(int i = n; i >= 1; --i) { l = min(l, poz[i]); r = max(r, poz[i]); int ll = 0; int rr = 0; int spots = (n-i)*2+1 - (r - l + 1); if(poz[i-1] < l) { ll = l - poz[i-1] - 1; rr = n - r; } else if(r < poz[i-1]) { ll = l-1; rr = poz[i-1] - r - 1; } else { spots = -1; } ll = min(ll, spots); rr = min(rr, spots); if(ll > rr) { swap(ll, rr); } //lld old_wyn = wyn; for(int j = 0; j <= ll; ++j) { wyn += min(rr, spots-j)+1; } //printf("%d: %lld\n", i, wyn-old_wyn); } printf("%d %lld\n", n*2+1, wyn); } /* 5 1 4 3 5 2 //*/ |
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