Submission #48956

#	Time	Username	Problem	Language	Result	Execution time	Memory
48956		Benq	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	259 ms	17820 KiB

bobek

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 100001;

ll n,m;
vl v[2];

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    v[0] = v[1] = {0};
    F0R(i,n) {
        ll x; cin >> x;
        F0Rd(j,sz(v[i&1])) v[i&1].pb(v[i&1][j]+x);
    }
    F0R(i,2) sort(all(v[i]));
    int i1 = sz(v[1])-1;
    ll ans = 0;
    F0R(i0,sz(v[0])) {
        while (i1 >= 0 && v[0][i0]+v[1][i1] > m) i1 --;
        ans += i1+1;
    }
    cout << ans;
}

// read the question correctly (is y a vowel? what are the exact constraints?)
// look out for SPECIAL CASES (n=1?) and overflow (ll vs int?)

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10