Submission #938119

#	Time	Username	Problem	Language	Result	Execution time	Memory
938119		sysia	Bigger segments (IZhO19_segments)	C++17	0 / 100	0 ms	452 KiB

segments

//Sylwia Sapkowska
#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
using namespace std;

void __print(int x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << "'" << x << "'";}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef LOCAL
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

#define int long long
typedef pair<int, int> T;
const int oo = 1e18, oo2 = 1e9+7, K = 50; 
const int mod = 998244353;

struct Tree{
    vector<int>tab;
    int size = 1;

    Tree(int n){
        while (size < n) size*=2;
        tab.assign(2*size, 0);
    }
    void update(int x, int v){
        x += size;
        tab[x] = max(tab[x], v);
        while (x){
            x/=2;
            tab[x] = max(tab[2*x], tab[2*x+1]);
        }
    }

    int query(int l, int r){
        int ans = 0;
        for (l += size-1, r += size+1; r-l>1; l/=2, r/=2){
            if (!(l&1)) ans = max(ans, tab[l+1]);
            if (r&1) ans = max(ans, tab[r-1]);
        }
        return ans;
    }
};

void solve(){
    int n; cin >> n;
    vector<int>a(n+1), pref(n+1);
    for (int i = 1; i<=n; i++){
        cin >> a[i];
        pref[i] = pref[i-1] + a[i];
    }
    //dp[i][wynik] = min suma
    vector dp(n+1, vector<int>(K+1, oo));
    for (int i = 1; i<=n; i++) dp[i][1] = pref[i];
    for (int j = 1; j<K; j++){
        for (int i = j; i<=n; i++){
            if (dp[i][j] == oo) continue;
            //dwa razy wieksza suma prefiksowa
            int p = (int)(lower_bound(pref.begin(), pref.end(), dp[i][j] + pref[i])-pref.begin());
            p = max(p, i+1);
            if (p < (int)pref.size()){
                dp[p][j+1] = min(dp[p][j+1], pref[p] - pref[i]);
            }
            // debug(i, j, dp[i][j]);
        }
    }
    int ans = 1;
    for (int j = 1; j<=K; j++){
        for (int i = 1; i<=n; i++){
            if (dp[i][j] != oo){
                ans = j;
                break;
            }
        }
    }
    cout << ans << "\n";
}

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    //cin >> t;
    while (t--) solve();

    return 0;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27