// Arti1990, II UWr
#include <bits/stdc++.h>
#define forr(i, n) for(int i=0; i<n; i++)
#define FOREACH(iter, coll) for(auto iter = coll.begin(); iter != coll.end(); ++iter)
#define FOREACHR(iter, coll) for(auto iter = coll.rbegin(); iter != coll.rend(); ++iter)
#define lbound(P,K,FUN) ({auto SSS=P, PPP = P-1, KKK=(K)+1; while(PPP+1!=KKK) {SSS = (PPP+(KKK-PPP)/2); if(FUN(SSS)) KKK = SSS; else PPP = SSS;} PPP;})
#define testy() int _tests; cin>>_tests; FOR(_test, 1, _tests)
#define CLEAR(tab) memset(tab, 0, sizeof(tab))
#define CONTAIN(el, coll) (coll.find(el) != coll.end())
#define FOR(i, a, b) for(int i=a; i<=b; i++)
#define FORD(i, a, b) for(int i=a; i>=b; i--)
#define MP make_pair
#define PB push_back
#define ff first
#define ss second
#define deb(X) X;
#define SIZE(coll) ((int)coll.size())
#define M 1000000007
#define INF 1000000007LL
using namespace std;
long long n, tab[1000007], diff[1000007], suma;
int ok[1000007];
vector <long long> dzielniki(long long x)
{
vector <long long> v;
for(long long i = 1; i*i <= x; i++)
if(x % i == 0)
{
v.PB(i);
v.PB(x/i);
}
return v;
}
vector <long long> czynniki(long long x)
{
vector <long long> v;
for(long long i = 2; i*i <= x; i++)
while(x % i == 0)
{
v.PB(i);
x /= i;
}
if(x > 1)
v.PB(x);
return v;
}
bool sprawdz(long long d)
{
// cout << "sprawdza " << d << '\n';
forr(i, n+3)
diff[i] = 0;
long long ile = 0;
forr(i, n)
{
ile += diff[i];
if(ile > tab[i])
return 0;
if(ile < tab[i])
{
diff[i + d] = - tab[i] + ile;
ile = tab[i];
}
}
// cout << ile << ", diff: " << diff[n] << '\n';
return ile + diff[n] == 0;
}
int solve()
{
cin >> n;
forr(i, n)
{
cin >> tab[i];
suma += tab[i];
}
auto dz = dzielniki(suma);
// cout << "dzielniki " << suma << ": ";
// for(auto el : dz)
// cout << el << ", ";
// cout << '\n';
long long res = 0;
for(auto d : dz)
{
if(d <= n)
if(sprawdz(d))
res = max(res, d);
}
cout << res << '\n';
return 0;
}
int main()
{
std::ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
solve();
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | // Arti1990, II UWr #include <bits/stdc++.h> #define forr(i, n) for(int i=0; i<n; i++) #define FOREACH(iter, coll) for(auto iter = coll.begin(); iter != coll.end(); ++iter) #define FOREACHR(iter, coll) for(auto iter = coll.rbegin(); iter != coll.rend(); ++iter) #define lbound(P,K,FUN) ({auto SSS=P, PPP = P-1, KKK=(K)+1; while(PPP+1!=KKK) {SSS = (PPP+(KKK-PPP)/2); if(FUN(SSS)) KKK = SSS; else PPP = SSS;} PPP;}) #define testy() int _tests; cin>>_tests; FOR(_test, 1, _tests) #define CLEAR(tab) memset(tab, 0, sizeof(tab)) #define CONTAIN(el, coll) (coll.find(el) != coll.end()) #define FOR(i, a, b) for(int i=a; i<=b; i++) #define FORD(i, a, b) for(int i=a; i>=b; i--) #define MP make_pair #define PB push_back #define ff first #define ss second #define deb(X) X; #define SIZE(coll) ((int)coll.size()) #define M 1000000007 #define INF 1000000007LL using namespace std; long long n, tab[1000007], diff[1000007], suma; int ok[1000007]; vector <long long> dzielniki(long long x) { vector <long long> v; for(long long i = 1; i*i <= x; i++) if(x % i == 0) { v.PB(i); v.PB(x/i); } return v; } vector <long long> czynniki(long long x) { vector <long long> v; for(long long i = 2; i*i <= x; i++) while(x % i == 0) { v.PB(i); x /= i; } if(x > 1) v.PB(x); return v; } bool sprawdz(long long d) { // cout << "sprawdza " << d << '\n'; forr(i, n+3) diff[i] = 0; long long ile = 0; forr(i, n) { ile += diff[i]; if(ile > tab[i]) return 0; if(ile < tab[i]) { diff[i + d] = - tab[i] + ile; ile = tab[i]; } } // cout << ile << ", diff: " << diff[n] << '\n'; return ile + diff[n] == 0; } int solve() { cin >> n; forr(i, n) { cin >> tab[i]; suma += tab[i]; } auto dz = dzielniki(suma); // cout << "dzielniki " << suma << ": "; // for(auto el : dz) // cout << el << ", "; // cout << '\n'; long long res = 0; for(auto d : dz) { if(d <= n) if(sprawdz(d)) res = max(res, d); } cout << res << '\n'; return 0; } int main() { std::ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); solve(); return 0; } |
English