Submission #1011313

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011313		kaopj	Sails (IOI07_sails)	C++17	100 / 100	66 ms	3932 KiB

sails

#include <iostream>
#include <vector>
#include <algorithm>
#define lgm cin.tie(0)->sync_with_stdio(0);
using namespace std;
#define int long long
#define h first
#define k second
pair<int,int> a[100007];
int dem[100007];
int n;
struct fenwick {
    int n;
    vector<int> t;
    fenwick(){}
    fenwick(int n):n(n),t(n+7,0){}
    void up(int x,int val) {
        for(;x<=n;x+=(x&(-x))) t[x]+=val;
    }
    int get(int x) {
        int ans=0;
        for(;x;x-=(x&(-x))) ans+=t[x];
        return ans;
    }
};
signed main() {
    lgm;
    cin >> n;
    for(int i=1;i<=n;i++) {
        cin >> a[i].h >> a[i].k;
    }
    sort(a+1,a+n+1);
    fenwick t(a[n].h);
    for (int i=1;i<=n;i++) {
        int h=a[i].h,k=a[i].k;
        int val=t.get(h-k);
        int l=1,r=h;
        int res=1;
        while (l<=r) {
            int m=(l+r)>>1;
            if (t.get(m)<=val) {
                res=m;
                r=m-1;
            } else {
                l=m+1;
            }
        }
        int left=res;
        l=1,r=h;
        res=h+1;
        while (l<=r) {
            int m=(l+r)>>1;
            if (t.get(m)>=val) {
                res=m;
                l=m+1;
            } else {
                r=m-1;
            }
        }
        int right=res;
        if (h==k) {
            right=0;
        }
        t.up(right+1,1);
        t.up(h+1,-1);
        t.up(left,1);
        t.up(left+(k-(h-right)),-1);
    }
    int ans=0;
    for(int i=1;i<=a[n].h;i++){
        int x=t.get(i);
        ans+=(x)*(x-1)/2;
    }
    cout<<ans;
    return 0;
}

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