#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
char A[500005];
int n, q, died[500005], P[500005], S[500005];
//ans = min(min(P[l..i]) - P[l - 1] - S[r + 1] + min(S[i..r]) + (A[i] == 'T')) across all i
struct node{
int s, e, m, val;
node *l, *r;
node(int _s, int _e){
s = _s, e = _e, m = (s + e) >> 1;
if(s != e)l = new node(s, m), r = new node(m+1, e);
val = 0;
}
void upd(int p, int v){
if(s == e)val = v;
else{
if(p <= m)l->upd(p, v);
else r->upd(p, v);
val = min(l->val, r->val);
}
}
int qry(int a, int b){
if(a == s && b == e)return val;
if(b <= m)return l->qry(a, b);
if(a > m)return r->qry(a, b);
return min(l->qry(a, m), r->qry(m+1, b));
}
}*root, *root2;
void solve(){
cin >> n;
for(int i = 1; i <= n; i++)cin >> A[i], P[i] = P[i - 1] + (A[i] == 'C' ? 1 : -1);
for(int i = n; i >= 1; i--)S[i] = S[i + 1] + (A[i] == 'C' ? 1 : -1);
cin >> q;
root = new node(0, n + 1);
root2 = new node(0, n + 1);
for(int i = 0; i <= n + 1; i++){
root->upd(i, P[i]);
root2->upd(i, S[i]);
}
while(q--){
int l, r; cin >> l >> r;
int mn = 0, cur = 0;
for(int i = l; i <= r; i++){
if(P[i] < cur){
cur = P[i];
mn = min(mn, root->qry(l - 1, i) + root2->qry(i, r + 1) + (A[i] == 'T') - P[l - 1] - S[r + 1]);
if(i < r)mn = min(mn, root->qry(l - 1, i + 1) + root2->qry(i + 1, r + 1) + (A[i + 1] == 'T') - P[l - 1] - S[r + 1]);
}
}
cur = 0;
for(int i = r; i >= l; i--){
if(S[i] < cur){
cur = S[i];
mn = min(mn, root->qry(l - 1, i) + root2->qry(i, r + 1) + (A[i] == 'T') - P[l - 1] - S[r + 1]);
if(i > l)mn = min(mn, root->qry(l - 1, i - 1) + root2->qry(i - 1, r + 1) + (A[i - 1] == 'T') - P[l - 1] - S[r + 1]);
}
}
cout << -mn << '\n';
}
}
main(){
ios::sync_with_stdio(0);cin.tie(0);
int tc = 1;
//cin >> tc;
for(int tc1=1;tc1<=tc;tc1++){
// cout << "Case #" << tc1 << ": ";
solve();
}
}
Compilation message
election.cpp:77:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
77 | main(){
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
46 ms |
856 KB |
Output is correct |
| 2 |
Incorrect |
18 ms |
856 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
46 ms |
856 KB |
Output is correct |
| 2 |
Incorrect |
18 ms |
856 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
46 ms |
856 KB |
Output is correct |
| 2 |
Incorrect |
18 ms |
856 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
