#include "sequence.h"
#include <bits/stdc++.h>
using namespace std;
int N;
int miin[500100 * 4];
int maax[500100 * 4];
int lazy[500100 * 4];
vector<int> in[500100];
vector<int> sat;
void build(int i, int s, int e){
miin[i] = - e - 1;
maax[i] = - s - 1;
lazy[i] = 0;
if(s != e){
int m = (s + e + 2)/2 - 1;
build(i * 2, s, m);
build(i * 2 + 1, m + 1, e);
}
}
void update(int i, int s, int e, int S){
if(S <= s){
miin[i] += 2;
maax[i] += 2;
lazy[i] += 2;
return;
}
int m = (s + e + 2)/2 - 1;
update(i * 2 + 1, m + 1, e, S);
if(S <= m){
update(i * 2, s, m, S);
}
miin[i] = min(miin[i * 2], miin[i * 2 + 1]) + lazy[i];
maax[i] = max(maax[i * 2], maax[i * 2 + 1]) + lazy[i];
}
pair<int,int> query(int i, int s, int e, int S, int E){
if(S <= s && e <= E){
return make_pair(miin[i],maax[i]);
}
int m = (s + e + 2)/2 - 1;
pair<int,int> ii,ii1;
if(S <= m && m < E){
ii = query(i * 2, s, m, S, E);
ii1 = query(i * 2 + 1, m + 1, e, S, E);
ii.first = min(ii.first, ii1.first) + lazy[i];
ii.second = max(ii.second, ii1.second) + lazy[i];
}
else if(S <= m){
ii = query(i * 2, s, m, S, E);
ii.first = ii.first + lazy[i];
ii.second = ii.second + lazy[i];
}
else{
ii = query(i * 2 + 1, m + 1, e, S, E);
ii.first = ii.first + lazy[i];
ii.second = ii.second + lazy[i];
}
return ii;
}
int sequence(int N, std::vector<int> lst) {
for(int i = 0; i < N; i++){
in[lst[i]].push_back(i);
}
int s,e,m;
s = 1;
e = N;
while(s != e){
m = (s + e + 1)/2;
build(1,-1,N-1);
bool flag = false;
for(int i = 1; i <= N; i++){
sat.clear();
//printf("mah %d %d \n",m,i);
sat.push_back(-1);
for(int j = 0; j < in[i].size() ; j++){
sat.push_back(in[i][j]);,
update(1,-1,N-1,in[i][j]);
}
sat.push_back(N);
for(int j = 1; j <= ((int)in[i].size()) - m + 1; j++){
pair<int,int> ii = query(1,-1,N - 1,-1,sat[j] - 1);
ii.second = ii.second + m * 2;
pair<int,int> ii1 = query(1, -1, N - 1, sat[j + m - 1], N - 1);
//printf("\n%d %d\n",ii.first,ii.second);
//printf("%d %d\n",ii1.first,ii1.second);
if( (ii1.second < ii.first) || (ii.second < ii1.first)) continue;
else{
flag = true;
break;
}
}
if(flag) break;
}
if(flag){
s = m;
}
else{
e = m - 1;
}
}
return s;
}
Compilation message
sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:98:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
98 | for(int j = 0; j < in[i].size() ; j++){
| ~~^~~~~~~~~~~~~~
sequence.cpp:99:41: error: expected primary-expression before ',' token
99 | sat.push_back(in[i][j]);,
| ^
