Submission #1028371

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028371		a5a7	Sails (IOI07_sails)	C++14	70 / 100	555 ms	6612 KiB

sails

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using indexedset = tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
typedef long double ld;

struct Node{
    ll value = 0;
    ll add = 0; 
    Node() {};
};
 
vector<Node> arr;
int length, arrl;
 
void build(int n){
    arr.clear();
    int powerOf2 = 1;
    while (powerOf2 < n) powerOf2 *= 2;
    n = powerOf2;
    length = 2 * n - 1, arrl = n;
    for (int i = 0; i < length; i++) arr.push_back(Node());
}

void pushdown(int left, int mid, int right, int node){
    if ((node*2+2) >= length){
        arr[node].add = 0;
        return;
    }
    arr[node*2+1].add += arr[node].add;
    arr[node*2+1].value += ll(mid-left+1) * arr[node].add;
    arr[node*2+2].add += arr[node].add;
    arr[node*2+2].value += ll(right-mid) * arr[node].add;
    arr[node].add = 0;
}

void pushup(int node){
    if ((node*2+2) >= length) return;
    arr[node].value = arr[node*2+2].value + arr[node*2+1].value;
}

void add(int left, int right, int start, int end, int node, ll ad){
    if (left > end || right < start) return;
    if (left <= start && end <= right){
        arr[node].value += ad * ll(end-start+1);
        arr[node].add += ad;
        return;
    }
    int mid = (start+end)/2;
    pushdown(start, mid, end, node);
    add(left, right, start, mid, node*2+1, ad);
    add(left, right, mid+1, end, node*2+2, ad);
    pushup(node);
}

ll range(int left, int right, int start, int end, int node){
    if (left > end || right < start) return 0;
    if (left <= start && end <= right) return arr[node].value;
    int mid = (start+end)/2;
    pushdown(start, mid, end, node);
    return range(left, right, start, mid, node*2+1) + range(left, right, mid+1, end, node*2+2);
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    build(100000);
    int last = 100000;
    pair<int, int> a[n];
    for (int i = 0; i < n; i++) cin >> a[i].first >> a[i].second;
    sort(a, a+n);
    ll ans = 0;
    function<int(int)> early = [&](int x){
        int left = -1, right = n-1;
        while (left < right){
            int mid = (left+right+1)/2;
            if (range(mid, mid, 0, arrl-1, 0) >= x){
                left = mid;
            }else{
                right = mid-1;
            }
        }
        return left;
    };
    for (int i = 0; i < n; i++){
        ans += range(a[i].first-a[i].second, a[i].first-1, 0, arrl-1, 0);
        int val = range(a[i].first-a[i].second, a[i].first-a[i].second, 0, arrl-1, 0);
        int start = early(val+1)+1;
        int end = min(early(val), a[i].first-1);
        add(a[i].first-a[i].second, a[i].first-1, 0, arrl-1, 0, 1ll);
        add(a[i].first-a[i].second, end, 0, arrl-1, 0, -1ll);
        add(start, start + end-a[i].first+a[i].second, 0, arrl-1, 0, 1ll);
    }
    cout << ans << endl;
} 

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:72:9: warning: unused variable 'last' [-Wunused-variable]
   72 |     int last = 100000;
      |         ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 0 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10