#include <bits/stdc++.h>
using namespace std;
struct segnode
{
int l,r,sum,val;
bool p;
segnode(int _l = 0, int _r = 0, int _sum = 0, int _val = 0, bool _p = 0)
{
l = _l;
r = _r;
sum = _sum;
val = _val;
p = _p;
}
segnode operator + (const segnode &s)
{
segnode res;
res.p = p | s.p;
res.l = l;
res.r = s.r;
if (!p)
res.l += s.l;
if (!s.p)
res.r += r;
int mid = r + s.l;
int sub = min(sum, s.sum) - mid;
if (sub > 0)
sub = 0;
sub += mid;
res.sum = sum + s.sum - sub;
res.val = val + s.val - sub;
return res;
}
};
const int N = 5e5 + 5;
segnode st[4 * N];
int a[N];
int n;
void build(int id, int l, int r)
{
if (l == r)
{
if (a[l] == 0)
st[id] = segnode(1, 1, 0, 1, 0);
else
st[id] = segnode(0, 0, 1, 0, 1);
return;
}
int mid = (l + r) >> 1;
build(id << 1, l, mid);
build(id << 1 | 1, mid + 1, r);
st[id] = st[id << 1] + st[id << 1 | 1];
}
segnode getval(int id, int l, int r, int u, int v)
{
if (l > v || r < u)
return segnode();
if (l >= u && r <= v)
return st[id];
int mid = (l + r) >> 1;
segnode lnode = getval(id << 1, l, mid, u, v);
segnode rnode = getval(id << 1 | 1, mid + 1, r, u, v);
return lnode + rnode;
}
int getans(int l, int r)
{
return getval(1, 1, n, l, r).val;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
//freopen("elections.in","r",stdin);
//freopen("elections.out","w",stdout);
cin >> n;
assert(n > 0);
for (int i = 1; i <= n; i++)
{
char c;
cin >> c;
a[i] = (c == 'C');
}
build(1, 1, n);
int q;
cin >> q;
while (q--)
{
int l,r;
cin >> l >> r;
cout << getans(l, r) << "\n";
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
26 ms |
39552 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
26 ms |
39552 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
26 ms |
39552 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |