#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)
const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};
void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;
template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "["; REP(i, U) out << v[i] << ", "; out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "["; REP(i, v.size()) out << v[i] << ", "; out << "]"; return out;}
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
int n; cin >> n;
vector<int> a(n);
cin >> a;
vector<array<ll, 3>> intervals;
vector<vector<ll>> ps(2, vector<ll>(n + 1, 0));
REP(i, n){
REP(j, 2){
ps[j][i + 1] += ps[j][i];
}
ps[i%2][i + 1] += a[i];
}
REP(i, n){
intervals.pb({i, i, a[i]});
}
ll ans = 0;
REP(i, (n + 1) / 2){
//dbg(intervals);
ll nid = 0;
REP(j, intervals.size()){
if(intervals[j][0] < 0 || intervals[j][1] >= n)
continue;
if(intervals[j][2] > intervals[nid][2])
nid = j;
}
ans += intervals[nid][2];
int nl = intervals[nid][0] - 1;
int nr = intervals[nid][1] + 1;
if(nid != 0 && intervals[nid - 1][1] == nl){
nl = intervals[nid - 1][0];
}
if(nid != (int)intervals.size() - 1 && intervals[nid + 1][0] == nr){
nr = intervals[nid + 1][1];
}
ll nch;
if(nl < 0 || nr >= n)
nch = -100;
else {
nch = ps[nl % 2][nr + 1] - ps[nl % 2][nl];
nch -= (ps[(nl + 1) % 2][nr + 1] - ps[(nl + 1) % 2][nl]);
}
vector<array<ll, 3>> nintervals;
REP(j, intervals.size()){
if(intervals[j][1] < nl)
nintervals.pb(intervals[j]);
}
nintervals.pb({nl, nr, nch});
REP(j, intervals.size()){
if(intervals[j][0] > nr)
nintervals.pb(intervals[j]);
}
intervals.swap(nintervals);
cout << ans << "\n";
}
return 0;
}
Compilation message
candies.cpp: In function 'int main()':
candies.cpp:19:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
| ^
candies.cpp:21:18: note: in expansion of macro 'FOR'
21 | #define REP(i,b) FOR(i,0,b,1)
| ^~~
candies.cpp:82:9: note: in expansion of macro 'REP'
82 | REP(j, intervals.size()){
| ^~~
candies.cpp:19:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
| ^
candies.cpp:21:18: note: in expansion of macro 'FOR'
21 | #define REP(i,b) FOR(i,0,b,1)
| ^~~
candies.cpp:105:9: note: in expansion of macro 'REP'
105 | REP(j, intervals.size()){
| ^~~
candies.cpp:19:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
| ^
candies.cpp:21:18: note: in expansion of macro 'FOR'
21 | #define REP(i,b) FOR(i,0,b,1)
| ^~~
candies.cpp:110:9: note: in expansion of macro 'REP'
110 | REP(j, intervals.size()){
| ^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
460 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
460 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
