#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
int n, q, buk;
char tip;
deque<int>mod;
int poz = 1;
int prefixx[100002], prefixy[100002], ans[100002];
int Le, Ri;
pair<int, int> dir[100002], xx[100002], yy[100002];
vector<vector<int> >aint[2];
void build(int nod, int st, int dr)
{
aint[0][nod].clear(), aint[1][nod].clear();
for(int i = st; i <= dr; ++i)
{
aint[0][nod].push_back(xx[i].se);
aint[1][nod].push_back(yy[i].se);
}
if(st == dr)
return;
sort(aint[0][nod].begin(), aint[0][nod].end());
sort(aint[1][nod].begin(), aint[1][nod].end());
int mid = (st + dr) / 2;
build(nod << 1, st, mid);
build(nod << 1|1, mid+1, dr);
}
void rebuild(int start_poz)
{
mod.clear();
prefixx[0] = 1; prefixy[0] = 1;
for(int i = 1; i <= n; ++i)
{
ans[i] = ans[i-1];
if(prefixx[i-1] > 0 && prefixx[i-1] + dir[i].fi < 0)
++ans[i];
if(prefixx[i-1] < 0 && prefixx[i-1] + dir[i].fi > 0)
++ans[i];
if(prefixy[i-1] > 0 && prefixy[i-1] + dir[i].se < 0)
++ans[i];
if(prefixy[i-1] < 0 && prefixy[i-1] + dir[i].se > 0)
++ans[i];
prefixx[i] = prefixx[i-1] + dir[i].fi;
prefixy[i] = prefixy[i-1] + dir[i].se;
}
Le = max(1, start_poz - buk);
Ri = min(n, start_poz + buk);
for(int i = Le; i <= Ri; ++i)
mod.push_back(i);
for(int i = 1; i <= n - (Ri + 1) + 1; ++i)
{
xx[i] = {max(prefixx[Ri + i], prefixx[Ri + i - 1]), min(prefixx[Ri + i], prefixx[Ri + i - 1])};
yy[i] = {max(prefixy[Ri + i], prefixy[Ri + i - 1]), min(prefixy[Ri + i], prefixy[Ri + i - 1])};
}
sort(xx + 1, xx + n - (Ri + 1) + 1 + 1);
sort(yy + 1, yy + n - (Ri + 1) + 1 + 1);
if(Ri != n)
build(1, 1, n - (Ri + 1) + 1);
}
int queryx(int nod, int st, int dr, int L, int R, int threshold)
{
if(dr < L || st > R)
return 0;
if(L <= st && dr <= R)
{
int st1 = 0;
int dr1 = aint[0][nod].size() - 1;
int ans = -1;
while(st1 <= dr1)
{
int mid = (st1 + dr1) / 2;
if(aint[0][nod][mid] < threshold)
ans = mid, st1 = mid + 1;
else
dr1 = mid - 1;
}
return (ans + 1);
}
int mid = (st + dr) / 2;
return queryx(nod << 1, st, mid, L, R, threshold) + queryx(nod << 1|1, mid+1, dr, L, R, threshold);
}
int queryy(int nod, int st, int dr, int L, int R, int threshold)
{
if(dr < L || st > R)
return 0;
if(L <= st && dr <= R)
{
int st1 = 0;
int dr1 = aint[1][nod].size() - 1;
int ans = -1;
while(st1 <= dr1)
{
int mid = (st1 + dr1) / 2;
if(aint[1][nod][mid] < threshold)
ans = mid, st1 = mid + 1;
else
dr1 = mid - 1;
}
return (ans + 1);
}
int mid = (st + dr) / 2;
return queryy(nod << 1, st, mid, L, R, threshold) + queryy(nod << 1|1, mid+1, dr, L, R, threshold);
}
int solve()
{
int start = mod[0] - 1;
int sol = ans[start];
int sumx = prefixx[start];
int sumy = prefixy[start];
for(int i = 0; i < mod.size(); ++i)
{
if(sumx > 0 && sumx + dir[mod[i]].fi < 0)
++sol;
if(sumx < 0 && sumx + dir[mod[i]].fi > 0)
++sol;
if(sumy > 0 && sumy + dir[mod[i]].se < 0)
++sol;
if(sumy < 0 && sumy + dir[mod[i]].se > 0)
++sol;
start = mod[i];
sumx += dir[mod[i]].fi;
sumy += dir[mod[i]].se;
}
if(Ri != n)
{
int st = 1;
int dr = n - Ri;
int ans = 0;
while(st <= dr)
{
int mid = (st + dr) / 2;
if(xx[mid].fi >= -(sumx - prefixx[mod.back()]))
ans = mid, dr = mid - 1;
else
st = mid + 1;
}
if(ans != 0)
sol += queryx(1, 1, n - Ri, ans, n - Ri, -(sumx - prefixx[mod.back()]));
st = 1;
dr = n - Ri;
ans = 0;
while(st <= dr)
{
int mid = (st + dr) / 2;
if(yy[mid].fi >= -(sumy - prefixy[mod.back()]))
ans = mid, dr = mid - 1;
else
st = mid + 1;
}
if(ans != 0)
sol += queryy(1, 1, n - Ri, ans, n - Ri, -(sumy - prefixy[mod.back()]));
}
return sol;
}
void solvegood()
{
rebuild(poz);
for(int i = 1; i <= q; ++i)
{
cin >> tip;
if(tip == 'B')
poz = max(1, poz - 1);
if(tip == 'F')
poz = min(poz + 1, n);
if(tip == 'Q')
cout << solve() << '\n';
if(tip == 'C')
{
int a, b;
cin >> a >> b;
dir[poz] = {a, b};
}
if(poz < Le || poz > Ri)
rebuild(poz);
}
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n;
for(int i = 1; i <= n; ++i)
cin >> dir[i].fi >> dir[i].se;
cin >> q;
buk = sqrt(q) / 2;
if(1LL * n * q <= 3)
{
int ans = 0;
for(int i = 1; i <= q; ++i)
{
cin >> tip;
if(tip == 'B')
poz = max(1, poz - 1);
if(tip == 'F')
poz = min(poz + 1, n);
if(tip == 'C')
{
int a, b;
cin >> a >> b;
dir[poz] = {a, b};
}
if(tip == 'Q')
{
ans = 0;
int pa = 1, pb = 1;
for(int j = 1; j <= n; ++j)
{
if(pa > 0 && pa + dir[j].fi < 0)
++ans;
if(pa < 0 && pa + dir[j].fi > 0)
++ans;
if(pb > 0 && pb + dir[j].se < 0)
++ans;
if(pb < 0 && pb + dir[j].se > 0)
++ans;
pa += dir[j].fi;
pb += dir[j].se;
}
cout << ans << '\n';
}
}
}
else
{
aint[0].resize(4 * n);
aint[1].resize(4 * n);
solvegood();
}
return 0;
}
Compilation message
ruka.cpp: In function 'int solve()':
ruka.cpp:111:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < mod.size(); ++i)
~~^~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
380 KB |
Output is correct |
| 2 |
Correct |
23 ms |
760 KB |
Output is correct |
| 3 |
Correct |
10 ms |
764 KB |
Output is correct |
| 4 |
Correct |
4 ms |
760 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
380 KB |
Output is correct |
| 2 |
Correct |
23 ms |
760 KB |
Output is correct |
| 3 |
Correct |
10 ms |
764 KB |
Output is correct |
| 4 |
Correct |
4 ms |
760 KB |
Output is correct |
| 5 |
Execution timed out |
2013 ms |
23504 KB |
Time limit exceeded |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
380 KB |
Output is correct |
| 2 |
Correct |
23 ms |
760 KB |
Output is correct |
| 3 |
Correct |
10 ms |
764 KB |
Output is correct |
| 4 |
Correct |
4 ms |
760 KB |
Output is correct |
| 5 |
Execution timed out |
2013 ms |
23504 KB |
Time limit exceeded |
| 6 |
Halted |
0 ms |
0 KB |
- |
