Submission #876522

#	Time	Username	Problem	Language	Result	Execution time	Memory
876522		MarwenElarbi	Sails (IOI07_sails)	C++17	0 / 100	74 ms	8736 KiB

sails

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define vi vector<int>
#define ve vector
#define ll long long
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define onbit __builtin_popcount
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e18
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
using namespace std;
using namespace __gnu_pbds;
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const ll MOD = 1e9+7;
const int nax = 2e5+5;
const int MAX_VAL = 1e6+1;
double PI=3.14159265359;
int arx[8]={1,0,0,-1,-1,-1, 1, 1};
int ary[8]={0,1,-1, 0, 1,-1,-1, 1};
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
vector<ii> tab;
ii segtree[nax*4];
ii lazy[nax*4];
void build(int pos,int l,int r)
{
    if (l==r){
        segtree[pos]={0,l};
        return;
    }
    int mid=(r+l)/2;
    build(pos*2+1,l,mid);
    build(pos*2+2,mid+1,r);
    if (segtree[pos*2+2].fi<=segtree[pos*2+1].fi) segtree[pos]=segtree[pos*2+2];
    else segtree[pos]=segtree[pos*2+1];
    return;
}
void expand(int pos)
{
    if (lazy[pos].fi==0) return;
    segtree[pos*2+1]=max(segtree[pos*2+1],lazy[pos]);
    segtree[pos*2+2]=max(segtree[pos*2+2],lazy[pos]);
    lazy[pos*2+1]=max(lazy[pos*2+1],lazy[pos]);
    lazy[pos*2+2]=max(lazy[pos*2+2],lazy[pos]);
    lazy[pos].fi=lazy[pos].se=0;
}
void update(int pos,int l,int r,int left,int right)
{
    if (l>r||r<left||l>right) return;
    if (l>=left&&r<=right){
        segtree[pos].fi++;
        lazy[pos].fi++;
        lazy[pos].se=segtree[pos].se;
        return;
    }
    expand(pos);
    int mid=(r+l)/2;
    update(pos*2+1,l,mid,left,right);
    update(pos*2+2,mid+1,r,left,right);
    if (segtree[pos*2+2].fi<=segtree[pos*2+1].se) segtree[pos]=segtree[pos*2+2];
    else segtree[pos]=segtree[pos*2+1];
    return;
}
ii query(int pos,int l,int r,int index)
{
    if (l==r){
        return segtree[pos];    
    }
    int mid=(r+l)/2;
    expand(pos);
    if (index<=mid) return query(pos*2+1,l,mid,index);
    else return query(pos*2+2,mid+1,r,index);
}
int main(){
    optimise;
    /*#ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif*/
    //setIO("boards");
    int n;
    cin>>n;
    tab.resize(n);
    int h=0;
    for (int i = 0; i < n; ++i)
    {
        cin>>tab[i].fi>>tab[i].se;
        h=max(h,tab[i].fi);
    }
    build(0,0,h-1);
    sort(tab.begin(),tab.end(),greater<>());
    for (int i = 0; i < n; ++i)
    {
        ii cur=tab[i];
        ii x=segtree[0];
        //cout <<"hey"<<x.fi<<" "<<x.se<<endl;
        int ne=min(x.se,cur.fi-1);
        if (ne>=cur.se-1){
            //cout <<x.se-cur.se<<" "<<x.se-1<<endl;
            update(0,0,h-1,ne-cur.se,ne-1);
        }else{
            update(0,0,h-1,0,ne-1);
            update(0,0,h-1,cur.fi-x.se-1,cur.fi-1);
        }
    }
    ll ans=0;
    for (int i = 0; i <= h; ++i)
    {
        ii x=query(0,0,h-1,i);
        ans+=(x.fi*(x.fi-1))/2;
    }
    cout <<ans<<endl;
}

Compilation message (stderr)

sails.cpp: In function 'void setIO(std::string)':
sails.cpp:35:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sails.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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