Submission #98778

#	Time	Username	Problem	Language	Result	Execution time	Memory
98778		someone_aa	Vudu (COCI15_vudu)	C++17	42 / 140	835 ms	66560 KiB

vudu

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define P pair<ll, ll>
using namespace std;
const int maxn = 1000100;
const int maxm = 3 * maxn;
int tree[maxm], m;

void update(int x,int val) {
    while(x<=m)  {
        tree[x]+=val;  x+=(x&-x);
    }
}

int query(int x) {
    int res=0;
    while(x>0)  {
        res+=tree[x];  x-=(x&-x);
    }
    return res;
}

ll n, d, arr[maxn];
map<ll, int> ind;
set<ll>values;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin>>n;
    for(int i=1;i<=n;i++) {
        cin>>arr[i];
    }
    cin>>d;
    ll sum = 0LL;
    for(ll i=1LL;i<=n;i++) {
        values.insert(sum - d*i);
        sum += arr[i];
        values.insert(sum - d*i - d);
    }

    int br = 1;
    for(ll i:values) {
        ind[i] = br++;
    }
    m = br;
    sum = 0LL;
    ll result = 0LL;
    for(int i=1;i<=n;i++) {
        update(ind[sum - d*i], 1);
        //cout<<i<<": "<<sum-d*i<<", "<<ind[sum-d*i]<<" -> ";
        sum += arr[i];

        result += 1LL * query(ind[sum - d*i - d]);
        //cout<<sum - d*i - d<<", "<<ind[sum-d*i-d]<<"\n";
    }
    cout<<result<<"\n";
    return 0;
}

• Subtask 1: 42 / 140