OJ-Problems-Source/HDOJ/5196_autoAC.cpp

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#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
const int N = 100005;
typedef long long ll;
int n, m;
ll q;
struct Hash {
int v, id;
void read(int id) {
scanf("%d", &v);
this->id = id;
}
} h[N];
bool cmp(Hash a, Hash b) {
return a.v < b.v;
}
int a[N];
int bit[N], l[N];
inline int lowbit(int x) {return (x&(-x));}
void add(int x, int v) {
while (x <= n) {
bit[x] += v;
x += lowbit(x);
}
}
int get(int x) {
int ans = 0;
while (x) {
ans += bit[x];
x -= lowbit(x);
}
return ans;
}
ll sum[N], sum2[N];
ll ans[N];
int X[N], Y[N];
void gao(ll q, int bo) {
if (q < 0) return;
memset(bit, 0, sizeof(bit));
int r = 0;
ll tot = 0;
for (int i = 1; i <= n; i++) {
while (r <= n && tot <= q) {
r++;
if (r > n) break;
tot += (r - i) - get(a[r]);
add(a[r], 1);
}
l[i] = r - 1;
add(a[i], -1);
tot -= get(a[i] - 1);
}
sum[n + 1] = 0;
for (int i = n; i >= 1; i--)
sum[i] = sum[i + 1] + (l[i] - i + 1);
int x, y;
for (int i = 0; i < m; i++) {
int x = X[i], y = Y[i];
int tmp = lower_bound(l + x, l + y + 1, y) - l - 1;
ans[i] += bo * (sum[x] - sum[tmp + 1] + sum2[y - tmp]);
}
}
int main() {
for (int i = 1; i < N; i++)
sum2[i] = sum2[i - 1] + i;
while (~scanf("%d%d%I64d", &n, &m, &q)) {
for (int i = 1; i <= n; i++)
h[i].read(i);
sort(h + 1, h + n + 1, cmp);
int tmp = 1;
a[h[1].id] = 1;
for (int i = 1; i <= n; i++) {
if (h[i].v != h[i - 1].v) tmp++;
a[h[i].id] = tmp;
}
for (int i = 0; i < m; i++) scanf("%d%d", &X[i], &Y[i]);
memset(ans, 0, sizeof(ans));
gao(q, 1); gao(q - 1, -1);
for (int i = 0; i < m; i++)
printf("%I64d\n", ans[i]);
}
return 0;
}