# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1184121 | hoa208 | Bigger segments (IZhO19_segments) | C++20 | 4 ms | 400 KiB |
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
#define t_test int t;cin >> t;while(t--)
const ll mod = 1e9 + 7;
const ll INF = 1e18;
inline void adm(ll &x){if(x>=mod)x%=mod;else if(x<0)x+=mod;}
//--------------------------------------------------------------------
const ll N = 500003;
pa dp[N];
ll a[N], n;
void hbmt() {
cin >> n;
assert(n <= 5000);
FOR(i, 1, n) {
cin >> a[i];
dp[i] = {-INF, INF};
}
dp[0] = {0, 0};
FOR(i, 1, n) {
ll sum = 0;
FORD(j, i, 1) {
sum += a[j];
if(sum >= dp[j - 1].se) {
if(dp[j - 1].fi + 1 > dp[i].fi) {
dp[i] = {dp[j - 1].fi + 1, sum};
}
}
}
}
cout << dp[n].fi << '\n';
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
if(fopen("hbmt.inp", "r")) {
freopen("hbmt.inp", "r", stdin);
freopen("hbmt.out", "w", stdout);
}
// t_test
hbmt();
return 0;
}
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