#include<bits/stdc++.h>
using namespace std;
#define MASK(i) (1LL << (i))
#define BIT(x, i) ((x >> (i)) & 1)
#define fi first
#define se second
#define ll long long
#define task "name"
const int oo = 1e9 + 7;
const ll loo = (ll)1e18 + 7;
const int MOD = 1e9 + 7;
const int N = 5e5 + 3;
const int BASE = 10;
template <typename T1, typename T2> bool minimize(T1 &a, T2 b)
{
if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b)
{
if (a < b) {a = b; return true;} return false;
}
struct nodes
{
int sum = 0;
int pr = 0;
int sf = 0;
int ans = 0;
} node[4 * N], base;
int n;
string s;
int a[N];
nodes add(nodes a, nodes b)
{
nodes c;
c.sum = a.sum + b.sum;
c.pr = max(a.pr, a.sum + b.pr);
c.sf = max(b.sf, b.sum + a.sf);
c.ans = max(a.sum + b.ans, a.ans + b.sum);
c.ans = max(c.ans, a.pr + b.sf);
return c;
}
void build(int id, int l, int r, int pos, int x)
{
if(l > r || pos < l || r > pos) return;
if (l == r)
{
node[id].sum = x;
maximize(node[id].pr, a[l]);
maximize(node[id].sf, a[l]);
maximize(node[id].ans, a[l]);
return;
}
int mid = (l + r)/2;
build(id * 2, l, mid, pos, x);
build(id * 2 + 1, mid + 1, r, pos, x);
node[id] = add(node[id * 2], node[id * 2 + 1]);
}
nodes get(int id, int l, int r, int u, int v)
{
if (r < u || v < l) return base;
if (u <= l && r <= v) return node[id];
int mid = (l + r)/2;
return add(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
freopen(task".inp" , "r" , stdin);
//freopen(task".out" , "w" , stdout);
cin >> n >> s;
for (int i = 0; i < n; i++)
{
if(s[i] == 'T')
{
a[i + 1] = 1;
build(1, 1, n, i + 1, 1);
}
else
{
a[i + 1] = -1;
build(1, 1, n, i + 1, -1);
}
}
int q;
cin >> q;
while(q--)
{
int l, r;
cin >> l >> r;
cout << get(1, 1, n, l, r).ans << '\n';
}
return 0;
}
Compilation message
election.cpp: In function 'int main()':
election.cpp:71:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
71 | freopen(task".inp" , "r" , stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
