#include<bits/stdc++.h>
using namespace std;
#define ll long long
typedef pair<int,int> pii;
typedef pair<int,pii> pip;
typedef pair<pii,int> ppi;
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define unicorn(x) x.resize(unique(x.begin(),x.end())-x.begin())
#define pb(x) push_back(x);
#define pp() pop_back();
const int L = 5e5+10, inf = 1e9;
int n;
int vote[L],ps[L],ss[L],tps[L],tss[L];
int gr[L];
vector<pii> sec;
random_device device;
default_random_engine rng(device());
#define randt(a,b) uniform_int_distribution<int64_t>(a,b)(rng)
void pr(int* vv,int l,int r){for(int i=l;i<r;i++){cout<<vv[i]<<" ";}cout<<endl;}
void prv(vector<int> vv){for(auto i:vv){cout<<i<<" ";}cout<<endl;}
void prl(long long* vv,int l,int r){for(int i=l;i<r;i++){cout<<vv[i]<<" ";}cout<<endl;}
void prvl(vector<long long> vv){for(auto i:vv){cout<<i<<" ";}cout<<endl;}
void prp(pii* vv,int l,int r){for(int i=l;i<r;i++){cout<<i<<": "<<vv[i].f<<" , "<<vv[i].s<<" / ";}cout<<endl;}
struct sagi{
struct node{
pii mn;
node(){
mn = pii(inf,inf);
}
}t[L<<2];
void build(int id,int l,int r,int* a){
if(l+1 == r){
t[id].mn = pii(a[l],l);
return;
}
int mid = (l+r)>>1;
build(2*id+0,l,mid,a);
build(2*id+1,mid,r,a);
t[id].mn = min(t[2*id+0].mn,t[2*id+1].mn);
}
pii get(int id,int l,int r,int l2,int r2){
if(l==l2 and r==r2){
return t[id].mn;
}
int mid = (l2+r2)>>1;
pii ans = pii(inf,inf);
if(l<mid)
ans = min(ans, get(2*id+0,l,min(r,mid),l2,mid));
if(r>mid)
ans = min(ans, get(2*id+1,max(l,mid),r,mid,r2));
return ans;
}
}pseg,sseg;
int z(int a){
if(a < 0)
return 0;
return a;
}
int main(){
//ofstream cout ("out.txt");
//ifstream cin ("in.txt");
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n;
map<char,int> inpc;
inpc['C'] = 1;
inpc['T'] = -1;
for(int i=1;i<=n;i++){
char inp;
cin>>inp;
vote[i] = inpc[inp];
}
ps[0] = ss[n+1] = tps[0] = tss[n+1] = 0;
for(int i=1;i<=n;i++){
ps[i] = ps[i-1] + vote[i];
tps[i] = tps[i-1] + (vote[i] == -1);
}
for(int i=n;i>=1;i--){
ss[i] = ss[i+1] + vote[i];
tss[i] = tss[i+1] + (vote[i] == -1);
}
int st = 10;
for(int i=1;i<=n;i++){
if(vote[i] != st){
sec.pb(pii(i,i));
st = vote[i];
gr[i] = sec.size()-1;
}
else{
sec.back().s++;
gr[i] = sec.size()-1;
}
}
//pr(gr,1,n+1);
//pr(tps,1,n+1);
//pr(tss,1,n+1);
pseg.build(1,1,n+1,ps);
sseg.build(1,1,n+1,ss);
int q;
cin>>q;
for(int tt=0;tt<q;tt++){
int l,r;
cin>>l>>r;
pii db = pseg.get(1,l,r+1,1,n+1);
pii df = sseg.get(1,l,r+1,1,n+1);
db.f -= ps[l-1];
df.f -= ss[r+1];
db.f = z(-db.f);
df.f = z(-df.f);
//cout<<"db: "<<db.f<<" "<<db.s<<endl;
//cout<<"df: "<<df.f<<" "<<df.s<<endl;
if(gr[db.s] == gr[df.s]){
pii rg = sec[gr[db.s]];
//cout<<"dec: "<<z(db.f-(tps[rg.f-1]-tps[l-1]))<<" "<<z(df.f-(tss[rg.s+1]-tss[r+1]))<<endl;
db.f -= min(z(db.f-(tps[max(rg.f,l)-1]-tps[l-1])),z(df.f-(tss[min(rg.s,r)+1]-tss[r+1])));
}
//cout<<"db: "<<db.f<<" "<<db.s<<endl;
cout<<z(db.f+df.f)<<endl;
//cout<<"-------------------------------------------"<<endl;
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
18 ms |
31836 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
18 ms |
31836 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
18 ms |
31836 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
