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#include <iostream>
using namespace std;
// #define DEBUG
#ifdef DEBUG
#define dassert(x) assert(x);
#define df(...) printf(__VA_ARGS__)
#else
#define dassert(x)
#define df(...)
#endif
#define x first
#define y second
#define mp make_pair
#define pb push_back
#define ir(x, a, b) ((a) <= (x) && (x) <= (b))
#define vec vector
#define sz(x) (ll)x.size()
#define foru(i, n) for (int i = 0; (i) < (n); ++(i))
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef pair<ll, ll> pll;
int read() {
int n = 0; bool b = 0; char c = getchar();
for (; !ir(c, '0', '9'); c = getchar()) b = (c == '-');
for (; ir(c, '0', '9'); c = getchar()) n = 10*n + (c-'0');
if (b) return -n;
return n;
}
const int N = 1e6+10;
int n;
ll a[N], idx[N];
int main() {
df("debug mode\n");
#ifndef DEBUG
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif
cin >> n;
foru (i, n) cin >> a[i];
foru (i, n) idx[a[i]] = i;
// always possible for [idx[n], idx[n]]
ll s = 0;
ll l, r;
l = r = idx[n];
for (int i = n; i >= 1; --i) {
l = min(l, idx[i]);
r = max(r, idx[i]);
int len = r-l+1, tops = n-i+1;
df("[%d, %d] len: %d\t tops:%d\n", l, r, len, tops);
if (ir(2*tops-2, 1, n)) {
ll x = 2*tops-2;
int bl = max(r-x+1, ll(0));
int br = min(n-x, l);
df("%d %d %d\n", x, bl, br);
s += max(br-bl+1, 0);
}
df("[half after %d] s: %d\n", i, s);
if (ir(2*tops-1, 1, n)) {
ll x = 2*tops-1;
int bl = max(r-x+1, ll(0));
int br = min(n-x, l);
df("%d %d %d\n", x, bl, br);
s += max(br-bl+1, 0);
}
df("[after %d] s: %d\n\n", i, s);
}
cout << 2 * n + 1 << " " << s << "\n";
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 | // _| _| // _| _| _| _| _|_| _|_|_| _|_|_| _| _| _|_| _|_| // _|_| _| _| _|_|_|_| _| _| _|_| _|_| _|_|_|_| _|_|_|_| // _| _| _| _| _| _| _| _|_| _| _| _| _| // _| _| _|_|_| _|_|_| _|_|_| _|_|_| _| _| _|_|_| _|_|_| // _| _| // _|_| _| #include <iostream> using namespace std; // #define DEBUG #ifdef DEBUG #define dassert(x) assert(x); #define df(...) printf(__VA_ARGS__) #else #define dassert(x) #define df(...) #endif #define x first #define y second #define mp make_pair #define pb push_back #define ir(x, a, b) ((a) <= (x) && (x) <= (b)) #define vec vector #define sz(x) (ll)x.size() #define foru(i, n) for (int i = 0; (i) < (n); ++(i)) #define all(x) (x).begin(), (x).end() typedef long long ll; typedef pair<ll, ll> pll; int read() { int n = 0; bool b = 0; char c = getchar(); for (; !ir(c, '0', '9'); c = getchar()) b = (c == '-'); for (; ir(c, '0', '9'); c = getchar()) n = 10*n + (c-'0'); if (b) return -n; return n; } const int N = 1e6+10; int n; ll a[N], idx[N]; int main() { df("debug mode\n"); #ifndef DEBUG ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); #endif cin >> n; foru (i, n) cin >> a[i]; foru (i, n) idx[a[i]] = i; // always possible for [idx[n], idx[n]] ll s = 0; ll l, r; l = r = idx[n]; for (int i = n; i >= 1; --i) { l = min(l, idx[i]); r = max(r, idx[i]); int len = r-l+1, tops = n-i+1; df("[%d, %d] len: %d\t tops:%d\n", l, r, len, tops); if (ir(2*tops-2, 1, n)) { ll x = 2*tops-2; int bl = max(r-x+1, ll(0)); int br = min(n-x, l); df("%d %d %d\n", x, bl, br); s += max(br-bl+1, 0); } df("[half after %d] s: %d\n", i, s); if (ir(2*tops-1, 1, n)) { ll x = 2*tops-1; int bl = max(r-x+1, ll(0)); int br = min(n-x, l); df("%d %d %d\n", x, bl, br); s += max(br-bl+1, 0); } df("[after %d] s: %d\n\n", i, s); } cout << 2 * n + 1 << " " << s << "\n"; return 0; } |
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