Submission #1147753

#	Time	Username	Problem	Language	Result	Execution time	Memory
1147753		yeediot	Towers (NOI22_towers)	C++20	100 / 100	929 ms	159272 KiB

Main

#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void CHECK();
void setio(){
    freopen("/Users/iantsai/cpp/input.txt","r",stdin);
    freopen("/Users/iantsai/cpp/output.txt","w",stdout);
}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
#define TOI_is_so_de ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);setio();
const int mxn = 1e6 + 5;
set<int>st[mxn];
vector<int>tx[mxn], x(mxn), y(mxn), l(mxn), r(mxn);
bool ans[mxn];
void solve(){
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> x[i] >> y[i];
        tx[x[i]].pb(i);
    }
    queue<int>q;
    auto ins = [&](int id){
        ans[id] = 1;
        st[y[id]].insert(x[id]);
        if(sz(st[y[id]]) == 3){
            q.push(y[id]);
        }
    };
    auto del = [&](int id){
        ans[id] = 0;
        st[y[id]].erase(x[id]);
    };
    for(int i = 1; i <= 1e6; i++){
        if(sz(tx[i]) == 0) continue;
        sort(all(tx[i]), [&](int a, int b){
            return y[a] < y[b];
        });
        l[i] = 0, r[i] = sz(tx[i]) - 1;
        ins(tx[i][l[i]]);
        if(l[i] != r[i]) ins(tx[i][r[i]]);
    }
    while(sz(q)){
        int v = q.front();
        q.pop();
        if(sz(st[v]) < 3) continue;
        vector<int>tmp;
        for(auto x : st[v]){
            if(x != *st[v].begin() and x != *prev(st[v].end())){
                tmp.pb(x);
            }
        }
        for(auto x : tmp){
            if(l[x] == r[x]){
                del(tx[x][l[x]]);
            }
            else if(y[tx[x][l[x]]] == v){
                del(tx[x][l[x]]);
                l[x]++;
                ins(tx[x][l[x]]);
            }
            else if(y[tx[x][r[x]]] == v){
                del(tx[x][r[x]]);
                r[x]--;
                ins(tx[x][r[x]]);
            }
        }
    }
    for(int i = 1; i <= n; i++){
        cout << ans[i];
    }
    cout << '\n';
}
signed main(){
    TOI_is_so_de;
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
    #ifdef local
    CHECK();
    #endif
}
/*
input:
 
*/
#ifdef local
void CHECK(){
    cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    function<bool(string,string)> compareFiles = [](string p1, string p2)->bool {
        std::ifstream file1(p1);
        std::ifstream file2(p2);
        if(!file1.is_open() || !file2.is_open()) return false;
        std::string line1, line2;
        while (getline(file1, line1) && getline(file2, line2)) {
            if (line1 != line2)return false;
        }
        int cnta = 0, cntb = 0;
        while(getline(file1,line1))cnta++;
        while(getline(file2,line2))cntb++;
        return cntb - cnta <= 1;
    };
    bool check = compareFiles("output.txt","expected.txt");
    if(check) cerr<<"ACCEPTED\n";
    else cerr<<"WRONG ANSWER!\n";
}
#else
#endif

• Subtask 1: 5 / 5
• Subtask 2: 11 / 11
• Subtask 3: 7 / 7
• Subtask 4: 6 / 6
• Subtask 5: 31 / 31
• Subtask 6: 21 / 21
• Subtask 7: 19 / 19