#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FORD(i,a,b) for(int i=(b)-1;i>=(a);--i)
#define REP(i,n) FOR(i,0,n)
#define REPD(i,n) FORD(i,0,n)
#define VAR(v,w) __typeof(w) v=(w)
#define FORE(it,c) for(VAR(it,(c).begin());it!=(c).end();++it)
#define PB push_back
#define ALL(c) (c).begin(),(c).end()
#define SIZE(c) ((int)(c).size())
#define MP make_pair
#define FT first
#define SD second
#define CLEAR(a) memset((a), 0, sizeof(a))
#define INT(x) int x; scanf("%d", &x)
#define LLG(x) LL x; scanf("%lld", &x)
#define STR(n,x) char x[n]; scanf("%s", x)
#define LINE(n,x) char x[n]; fgets(x, n, stdin)
typedef long long LL;
typedef unsigned long long ULL;
typedef long double LD;
typedef pair<int,int> PII;
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<VI> VVI;
typedef vector<PII> VII;
typedef vector<double> VD;
typedef vector<LD> VLD;
typedef vector<LL> VLL;
typedef vector<bool> VB;
int a[1000000], b[1000000];
int main() {
INT(n);
REP(i,n) scanf("%d", &a[i]);
REP(i,n) --a[i];
REP(i,n) b[a[i]] = i;
int x = b[n - 1], y = b[n - 1] + 1;
LL r = 0;
FOR(i,1,n+1) {
if (!(i & 1)) {
int j = b[n - (i >> 1) - 1];
x = min(x, j);
y = max(y, j + 1);
}
int room = min(n, x + i) - max(0, y - i) - i + 1;
if (room > 0) r += room;
}
printf("%d %lld\n", (n << 1) + 1, r);
}
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 | #include <algorithm> #include <cmath> #include <cstdio> #include <cstdlib> #include <cstring> #include <functional> #include <iostream> #include <list> #include <map> #include <queue> #include <set> #include <sstream> #include <stack> #include <string> #include <utility> #include <vector> using namespace std; #define FOR(i,a,b) for(int i=(a);i<(b);++i) #define FORD(i,a,b) for(int i=(b)-1;i>=(a);--i) #define REP(i,n) FOR(i,0,n) #define REPD(i,n) FORD(i,0,n) #define VAR(v,w) __typeof(w) v=(w) #define FORE(it,c) for(VAR(it,(c).begin());it!=(c).end();++it) #define PB push_back #define ALL(c) (c).begin(),(c).end() #define SIZE(c) ((int)(c).size()) #define MP make_pair #define FT first #define SD second #define CLEAR(a) memset((a), 0, sizeof(a)) #define INT(x) int x; scanf("%d", &x) #define LLG(x) LL x; scanf("%lld", &x) #define STR(n,x) char x[n]; scanf("%s", x) #define LINE(n,x) char x[n]; fgets(x, n, stdin) typedef long long LL; typedef unsigned long long ULL; typedef long double LD; typedef pair<int,int> PII; typedef vector<int> VI; typedef vector<string> VS; typedef vector<VI> VVI; typedef vector<PII> VII; typedef vector<double> VD; typedef vector<LD> VLD; typedef vector<LL> VLL; typedef vector<bool> VB; int a[1000000], b[1000000]; int main() { INT(n); REP(i,n) scanf("%d", &a[i]); REP(i,n) --a[i]; REP(i,n) b[a[i]] = i; int x = b[n - 1], y = b[n - 1] + 1; LL r = 0; FOR(i,1,n+1) { if (!(i & 1)) { int j = b[n - (i >> 1) - 1]; x = min(x, j); y = max(y, j + 1); } int room = min(n, x + i) - max(0, y - i) - i + 1; if (room > 0) r += room; } printf("%d %lld\n", (n << 1) + 1, r); } |
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