// Arti1990, II UWr
#include <bits/stdc++.h>
#define forr(i, n) for(int i=0; i<n; i++)
#define FOREACH(iter, coll) for(auto iter = coll.begin(); iter != coll.end(); ++iter)
#define FOREACHR(iter, coll) for(auto iter = coll.rbegin(); iter != coll.rend(); ++iter)
#define lbound(P,K,FUN) ({auto SSS=P, PPP = P-1, KKK=(K)+1; while(PPP+1!=KKK) {SSS = (PPP+(KKK-PPP)/2); if(FUN(SSS)) KKK = SSS; else PPP = SSS;} PPP;})
#define testy() int _tests; scanf("%d", &_tests); FOR(_test, 1, _tests)
#define CLEAR(tab) memset(tab, 0, sizeof(tab))
#define CONTAIN(el, coll) (coll.find(el) != coll.end())
#define FOR(i, a, b) for(int i=a; i<=b; i++)
#define FORD(i, a, b) for(int i=a; i>=b; i--)
#define MP make_pair
#define PB push_back
#define ff first
#define ss second
#define deb(X) X;
#define M 1000000007
#define INF 1000000007LL
using namespace std;
int n;
int tab[1000007], gdzie[1000007];
pair<int, int> solve()
{
scanf("%d", &n);
FOR(i, 1, n)
{
scanf("%d", &tab[i]);
gdzie[tab[i]] = i;
}
int pocz = n, kon = 1;
long long res = 0;
FOR(dl, 0, n)
{
if(dl%2 == 0)
{
pocz = min(pocz, gdzie[n-dl/2]);
kon = max(kon, gdzie[n-dl/2]);
}
if(kon-pocz+1 <= dl)
{
int l = max(kon-dl+1, 1);
int p = min(n-dl+1, pocz);
res += p-l+1;
}
// cout << "dl: " << dl << ", res: " << res << endl;
}
cout << 2*n+1 << " " << res << endl;
return MP(2*n+1, res);
}
int main()
{/*
n = 1000000;
cout << n << endl;
vector <int> v;
for(int i=1; i<n; i += 2)
v.PB(i);
for(int i=n; i>0; i -= 2)
v.PB(i);
FOR(i, 0, n-1)
cout << v[i] << " ";
cout << endl;
return 0;
*/
auto p = solve();
return 0;
srand(time(0));
forr(x, 1000)
{
if(x%100 == 0)
cout << x << endl;
n = rand()%100+1;
FOR(i, 1, n)
tab[i] = i;
random_shuffle(tab+1, tab+n+1);
//FOR(i, 1, n)
// cout << tab[i] << " ";
//cout << endl;
auto p = solve();
int res=0, ile=0;
FOR(pocz, 1, n)
FOR(kon, pocz, n)
{
int dl = kon-pocz+1;
vector <int> v;
FOR(i, pocz, kon)
v.PB(tab[i]);
sort(v.begin(), v.end());
int r = kon-pocz+1 + v[dl/2] + v[(dl-1)/2];
if(r > res)
{
res = r;
ile = 1;
}
else if(res == r)
ile++;
}
if(res != p.ff || ile != p.ss)
{
cout << "ZLE!\n";
FOR(i, 1, n)
cout << tab[i] << " ";
cout << endl;
cout << "mialo byc " << res << " " << ile << endl;
cout << "jest " << p.ff << " " << p.ss << endl;
}
//else
//cout << "OK\n";
}
//solve();
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 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | // Arti1990, II UWr #include <bits/stdc++.h> #define forr(i, n) for(int i=0; i<n; i++) #define FOREACH(iter, coll) for(auto iter = coll.begin(); iter != coll.end(); ++iter) #define FOREACHR(iter, coll) for(auto iter = coll.rbegin(); iter != coll.rend(); ++iter) #define lbound(P,K,FUN) ({auto SSS=P, PPP = P-1, KKK=(K)+1; while(PPP+1!=KKK) {SSS = (PPP+(KKK-PPP)/2); if(FUN(SSS)) KKK = SSS; else PPP = SSS;} PPP;}) #define testy() int _tests; scanf("%d", &_tests); FOR(_test, 1, _tests) #define CLEAR(tab) memset(tab, 0, sizeof(tab)) #define CONTAIN(el, coll) (coll.find(el) != coll.end()) #define FOR(i, a, b) for(int i=a; i<=b; i++) #define FORD(i, a, b) for(int i=a; i>=b; i--) #define MP make_pair #define PB push_back #define ff first #define ss second #define deb(X) X; #define M 1000000007 #define INF 1000000007LL using namespace std; int n; int tab[1000007], gdzie[1000007]; pair<int, int> solve() { scanf("%d", &n); FOR(i, 1, n) { scanf("%d", &tab[i]); gdzie[tab[i]] = i; } int pocz = n, kon = 1; long long res = 0; FOR(dl, 0, n) { if(dl%2 == 0) { pocz = min(pocz, gdzie[n-dl/2]); kon = max(kon, gdzie[n-dl/2]); } if(kon-pocz+1 <= dl) { int l = max(kon-dl+1, 1); int p = min(n-dl+1, pocz); res += p-l+1; } // cout << "dl: " << dl << ", res: " << res << endl; } cout << 2*n+1 << " " << res << endl; return MP(2*n+1, res); } int main() {/* n = 1000000; cout << n << endl; vector <int> v; for(int i=1; i<n; i += 2) v.PB(i); for(int i=n; i>0; i -= 2) v.PB(i); FOR(i, 0, n-1) cout << v[i] << " "; cout << endl; return 0; */ auto p = solve(); return 0; srand(time(0)); forr(x, 1000) { if(x%100 == 0) cout << x << endl; n = rand()%100+1; FOR(i, 1, n) tab[i] = i; random_shuffle(tab+1, tab+n+1); //FOR(i, 1, n) // cout << tab[i] << " "; //cout << endl; auto p = solve(); int res=0, ile=0; FOR(pocz, 1, n) FOR(kon, pocz, n) { int dl = kon-pocz+1; vector <int> v; FOR(i, pocz, kon) v.PB(tab[i]); sort(v.begin(), v.end()); int r = kon-pocz+1 + v[dl/2] + v[(dl-1)/2]; if(r > res) { res = r; ile = 1; } else if(res == r) ile++; } if(res != p.ff || ile != p.ss) { cout << "ZLE!\n"; FOR(i, 1, n) cout << tab[i] << " "; cout << endl; cout << "mialo byc " << res << " " << ile << endl; cout << "jest " << p.ff << " " << p.ss << endl; } //else //cout << "OK\n"; } //solve(); return 0; } |
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