#include <cstdio>
#include <algorithm>
using namespace std;
const int MAXN = 1000000;
int a[MAXN+10];
int maxl[MAXN+10];
int maxr[MAXN+10];
int main() {
int n, nodel;
long long wynik = 0;
scanf("%d", &n);
maxl[0] = 0;
maxr[n+1] = 0;
for (int i = 1; i <= n; ++i) {
scanf("%d", a+i);
maxl[i] = max(maxl[i-1], a[i]);
}
for (int i = n; i >= 1; --i) {
maxr[i] = max(maxr[i+1], a[i]);
}
int l = 0, r = n+1, ul, ur;
for (int i = 0; i <= n; ++i) {
nodel = n - (n-i+2)/2 + 1;
while (maxl[l]<nodel)
++l;
--l;
while(maxr[r]<nodel)
--r;
++r;
ul = min(i, l);
ur = max(n+1-i, r);
if (ul + (n+1-ur) >= i) {
wynik += ul + (n+1-ur) - i + 1;
}
}
printf("%d %lld\n", 2*n+1, wynik);
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 | #include <cstdio> #include <algorithm> using namespace std; const int MAXN = 1000000; int a[MAXN+10]; int maxl[MAXN+10]; int maxr[MAXN+10]; int main() { int n, nodel; long long wynik = 0; scanf("%d", &n); maxl[0] = 0; maxr[n+1] = 0; for (int i = 1; i <= n; ++i) { scanf("%d", a+i); maxl[i] = max(maxl[i-1], a[i]); } for (int i = n; i >= 1; --i) { maxr[i] = max(maxr[i+1], a[i]); } int l = 0, r = n+1, ul, ur; for (int i = 0; i <= n; ++i) { nodel = n - (n-i+2)/2 + 1; while (maxl[l]<nodel) ++l; --l; while(maxr[r]<nodel) --r; ++r; ul = min(i, l); ur = max(n+1-i, r); if (ul + (n+1-ur) >= i) { wynik += ul + (n+1-ur) - i + 1; } } printf("%d %lld\n", 2*n+1, wynik); return 0; } |
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