Submission #176016

#	Time	Username	Problem	Language	Result	Execution time	Memory
176016		istlemin	Bigger segments (IZhO19_segments)	C++14	0 / 100	2 ms	504 KiB

segments

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")

using namespace std;

#define rep(i, a, b) for(ll i = a; i < ll(b); ++i)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (ll)(x).size()
typedef long long ll;
typedef pair<ll, ll> pii;
typedef vector<ll> vi;

int main() {
    //cin.sync_with_stdio(0); cin.tie(0);
    //cin.exceptions(cin.failbit);
    ll n;
    cin>>n;
    vi a(n);
    rep(i,0,n) cin>>a[i];

    vector<vi> dp(n,vi(n+1,-10));

    rep(i,0,n+1) dp[0][i] = 0;

    rep(i,1,n){
        ll sum = 0;
        rep(j,i,n){
            sum += a[j];
            ll sum2 = 0;
            for(ll k = i-1;k>=0;k--){
                sum2 += a[k];
                if(sum2>sum) break;
                dp[i][j] = max(dp[i][j],dp[k][i-1]+1);
            }
        }
    }
    /*
    rep(i,0,n) {
        rep(j,0,n) {
            printf("%3d ",dp[i][j]);
        }
        printf("\n");
    }*/

    rep(i,0,n) {
        rep(j,0,n) {
            if(j<n-1 && dp[i][j]>=0 && dp[i][j+1]>=0){
                assert(dp[i][j]==dp[i][j+1]);
                /*if(dp[i][j]!=dp[i][j+1]){
                    cout<<"("<<i<<","<<j<<"): "<<dp[i][j]<<endl;
                    cout<<"("<<i<<","<<j+1<<"): "<<dp[i][j+1]<<endl;
                }*/
            }
        }
    }
    ll ans = 0;
    rep(i,0,n) ans = max(ans,dp[i][n-1]);
    cout<<ans+1<<endl; 
}

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