#include<bits/stdc++.h>
#define fi first
#pragma GCC optimize("Ofast")
#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];
int last_answer;
struct st
{
char c;
int a, b;
};
st vov[300002];
void build(int nod, int st, int dr)
{
aint[0][nod].resize(dr - st + 1), aint[1][nod].resize(dr - st + 1);
if(st == dr)
{
aint[0][nod][0] = (xx[st].se);
aint[1][nod][0] = (yy[st].se);
return;
}
int mid = (st + dr) / 2;
build(nod << 1, st, mid);
build(nod << 1|1, mid+1, dr);
int pa = 0;
int pb = 0;
int pop = 0;
while(pa < aint[0][nod << 1].size() && pb < aint[0][nod << 1|1].size())
{
if(aint[0][nod << 1][pa] <= aint[0][nod << 1|1][pb])
aint[0][nod][pop] = aint[0][nod << 1][pa], ++pa;
else
aint[0][nod][pop] = aint[0][nod << 1|1][pb], ++pb;
++pop;
}
while(pa < aint[0][nod << 1].size())
aint[0][nod][pop] = aint[0][nod << 1][pa], ++pa, ++pop;
while(pb < aint[0][nod << 1|1].size())
aint[0][nod][pop] = aint[0][nod << 1|1][pb], ++pb, pop++;
pa = 0;
pb = 0;
pop = 0;
while(pa < aint[1][nod << 1].size() && pb < aint[1][nod << 1|1].size())
{
if(aint[1][nod << 1][pa] <= aint[1][nod << 1|1][pb])
aint[1][nod][pop] = aint[1][nod << 1][pa], ++pa, ++pop;
else
aint[1][nod][pop] = aint[1][nod << 1|1][pb], ++pb, ++pop;
}
while(pa < aint[1][nod << 1].size())
aint[1][nod][pop] = aint[1][nod << 1][pa], ++pa, ++pop;
while(pb < aint[1][nod << 1|1].size())
aint[1][nod][pop] = aint[1][nod << 1|1][pb], ++pb, ++pop;
}
int orgx, orgy;
void rebuild(int nrq, int start_poz)
{
Le = Ri = start_poz;
for(int i = nrq; i <= q; ++i)
{
if(vov[i].c == 'B')
{
start_poz = max(1, start_poz - 1);
Le = min(Le, start_poz);
}
if(vov[i].c == 'F')
{
start_poz = min(n, start_poz + 1);
Ri = max(Ri, start_poz);
}
if(Ri - Le + 1 >= 2000)
break;
}
mod.clear();
prefixx[0] = 1; prefixy[0] = 1;
for(int i = max(1, start_poz - 2500); 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;
}
for(int i = Le; i <= Ri; ++i)
mod.push_back(i);
orgx = prefixx[mod.back()];
orgy = prefixy[mod.back()];
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 minii)
{
int start = minii - 1;
int sol = ans[start];
int sumx = prefixx[start];
int sumy = prefixy[start];
bool op = 0;
for(int i = minii - mod[0]; i < mod.size(); ++i)
{
op = 1;
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;
prefixx[mod[i]] = sumx;
prefixy[mod[i]] = sumy;
ans[mod[i]] = sol;
}
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 - orgx))
ans = mid, dr = mid - 1;
else
st = mid + 1;
}
if(ans != 0)
sol += queryx(1, 1, n - Ri, ans, n - Ri, -(sumx - orgx));
st = 1;
dr = n - Ri;
ans = 0;
while(st <= dr)
{
int mid = (st + dr) / 2;
if(yy[mid].fi >= -(sumy - orgy))
ans = mid, dr = mid - 1;
else
st = mid + 1;
}
if(ans != 0)
sol += queryy(1, 1, n - Ri, ans, n - Ri, -(sumy - orgy));
}
return sol;
}
void solvegood()
{
int lq = 0;
for(int i = 1; i <= q; ++i)
{
cin >> vov[i].c;
if(vov[i].c == 'C')
cin >> vov[i].a >> vov[i].b;
if(vov[i].c == 'Q')
lq = i;
}
rebuild(1, poz);
last_answer = -1;
int minii = mod.back() + 1;
for(int i = 1; i <= lq; ++i)
{
char tip = vov[i].c;
if(tip == 'B')
poz = max(1, poz - 1);
if(tip == 'F')
poz = min(poz + 1, n);
if(tip == 'Q')
{
if(last_answer == -1)
last_answer = solve(minii);
cout << last_answer << '\n';
minii = mod.back() + 1;
}
if(tip == 'C')
{
int a = vov[i].a, b = vov[i].b;
dir[poz] = {a, b};
minii = min(minii, poz);
last_answer = -1;
}
if(poz < Le || poz > Ri)
{
last_answer = -1;
rebuild(i, poz);
minii = mod.back() + 1;
}
}
}
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;
aint[0].resize(300000);
aint[1].resize(300000);
solvegood();
return 0;
}
Compilation message
ruka.cpp: In function 'void build(int, int, int)':
ruka.cpp:36:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pa < aint[0][nod << 1].size() && pb < aint[0][nod << 1|1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:36:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pa < aint[0][nod << 1].size() && pb < aint[0][nod << 1|1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:44:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pa < aint[0][nod << 1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:46:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pb < aint[0][nod << 1|1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:51:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pa < aint[1][nod << 1].size() && pb < aint[1][nod << 1|1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:51:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pa < aint[1][nod << 1].size() && pb < aint[1][nod << 1|1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:58:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pa < aint[1][nod << 1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:60:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(pb < aint[1][nod << 1|1].size())
~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp: In function 'int solve(int)':
ruka.cpp:163:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = minii - mod[0]; i < mod.size(); ++i)
~~^~~~~~~~~~~~
ruka.cpp:162:10: warning: variable 'op' set but not used [-Wunused-but-set-variable]
bool op = 0;
^~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
15 ms |
14456 KB |
Output is correct |
| 2 |
Correct |
16 ms |
14584 KB |
Output is correct |
| 3 |
Correct |
16 ms |
14712 KB |
Output is correct |
| 4 |
Correct |
17 ms |
14712 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
15 ms |
14456 KB |
Output is correct |
| 2 |
Correct |
16 ms |
14584 KB |
Output is correct |
| 3 |
Correct |
16 ms |
14712 KB |
Output is correct |
| 4 |
Correct |
17 ms |
14712 KB |
Output is correct |
| 5 |
Correct |
540 ms |
27788 KB |
Output is correct |
| 6 |
Correct |
444 ms |
20344 KB |
Output is correct |
| 7 |
Correct |
551 ms |
28228 KB |
Output is correct |
| 8 |
Correct |
534 ms |
28420 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
15 ms |
14456 KB |
Output is correct |
| 2 |
Correct |
16 ms |
14584 KB |
Output is correct |
| 3 |
Correct |
16 ms |
14712 KB |
Output is correct |
| 4 |
Correct |
17 ms |
14712 KB |
Output is correct |
| 5 |
Correct |
540 ms |
27788 KB |
Output is correct |
| 6 |
Correct |
444 ms |
20344 KB |
Output is correct |
| 7 |
Correct |
551 ms |
28228 KB |
Output is correct |
| 8 |
Correct |
534 ms |
28420 KB |
Output is correct |
| 9 |
Correct |
1612 ms |
34012 KB |
Output is correct |
| 10 |
Execution timed out |
2045 ms |
44372 KB |
Time limit exceeded |
| 11 |
Halted |
0 ms |
0 KB |
- |
