// Karol Kosinski 2021
#include <bits/stdc++.h>
// #define ENABLE_DEBUG
#define FOR(i,a,b) for(int i=(a),_b=(b);i<_b;++i)
#define FR_(i,a,b) for(int i=(a),_b=(b);i<=_b;++i)
#define FD_(i,b,a) for(int i=(b),_a=(a);i>=_a;--i)
#define ALL(c) (c).begin(),(c).end()
#define SIZE(c) int((c).size())
#define TIE(x...) int x;tie(x)
#define X first
#define Y second
#ifndef ENABLE_DEBUG
#define DEB(k,f,x...)
#else
#define DEB(k,f,x...) {if(k)printf("--------%4d : %s\n",__LINE__,__FUNCTION__);f(x);}
#endif
#define DEBL DEB(1,void,0)
#define DEBF(f,x...) DEB(1,f,x)
#define DEBUG(x...) DEB(0,printf,x)
using namespace std;
using LL = long long;
using ULL = unsigned long long;
using PII = pair<int, int>;
using TIII = tuple<int, int, int>;
constexpr int NX = 1'000'003;
int A[NX], B[NX];
LL count(int n, int a)
{
LL res = 0;
int left = B[n], right = B[n], i = n - 1, j = a;
while ( j <= n )
{
if ( B[i] < left ) left = B[i];
else if ( right < B[i] ) right = B[i];
int r = right - left;
int z = j - r, u = 0;
DEBUG("*** i = %d , j = %d , left = %d , right = %d , z = %d\n", i, j, left, right, z);
if ( z > 0 )
{
int l_lim = left - ( z - 1 ), r_lim = right + ( z - 1 );
if ( 1 > l_lim ) u += 1 - l_lim ;
DEBUG(" --> u = %d\n", u);
if ( r_lim > n ) u += r_lim - n;
DEBUG(" --> u = %d\n", u);
res += z - u;
}
j += 2;
-- i;
}
DEBUG("%d -> %lld\n", a, res);
return res;
}
int main()
{
int n;
scanf("%d", &n);
FR_(i,1,n) scanf("%d", A + i);
FR_(i,1,n) B[ A[i] ] = i;
LL res = 1;
res += count( n, 3 );
res += count( n, 2 );
printf("%d %lld\n", 2 * n + 1, res);
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 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | // Karol Kosinski 2021 #include <bits/stdc++.h> // #define ENABLE_DEBUG #define FOR(i,a,b) for(int i=(a),_b=(b);i<_b;++i) #define FR_(i,a,b) for(int i=(a),_b=(b);i<=_b;++i) #define FD_(i,b,a) for(int i=(b),_a=(a);i>=_a;--i) #define ALL(c) (c).begin(),(c).end() #define SIZE(c) int((c).size()) #define TIE(x...) int x;tie(x) #define X first #define Y second #ifndef ENABLE_DEBUG #define DEB(k,f,x...) #else #define DEB(k,f,x...) {if(k)printf("--------%4d : %s\n",__LINE__,__FUNCTION__);f(x);} #endif #define DEBL DEB(1,void,0) #define DEBF(f,x...) DEB(1,f,x) #define DEBUG(x...) DEB(0,printf,x) using namespace std; using LL = long long; using ULL = unsigned long long; using PII = pair<int, int>; using TIII = tuple<int, int, int>; constexpr int NX = 1'000'003; int A[NX], B[NX]; LL count(int n, int a) { LL res = 0; int left = B[n], right = B[n], i = n - 1, j = a; while ( j <= n ) { if ( B[i] < left ) left = B[i]; else if ( right < B[i] ) right = B[i]; int r = right - left; int z = j - r, u = 0; DEBUG("*** i = %d , j = %d , left = %d , right = %d , z = %d\n", i, j, left, right, z); if ( z > 0 ) { int l_lim = left - ( z - 1 ), r_lim = right + ( z - 1 ); if ( 1 > l_lim ) u += 1 - l_lim ; DEBUG(" --> u = %d\n", u); if ( r_lim > n ) u += r_lim - n; DEBUG(" --> u = %d\n", u); res += z - u; } j += 2; -- i; } DEBUG("%d -> %lld\n", a, res); return res; } int main() { int n; scanf("%d", &n); FR_(i,1,n) scanf("%d", A + i); FR_(i,1,n) B[ A[i] ] = i; LL res = 1; res += count( n, 3 ); res += count( n, 2 ); printf("%d %lld\n", 2 * n + 1, res); return 0; } |
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