Submission #1150734

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150734		sofiefu	Inside information (BOI21_servers)	C++20	2 / 100	1083 ms	9720 KiB

servers

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define vo vector
#define pb push_back
#define se second
#define fi first
#define all(v) v.begin(), v.end()
typedef vector<int> vi;
typedef pair<int, int> pii;

#define rep(i, a, b) for(int i=(a); i<b; i++)
#define pr1(x) cerr << #x << '=' << x << ' ';
//for google contests
#define umap unordered_map
#define uset unordered_set
#define repd(i, a, b) for(int i=(b-1); i >= a; i--)
void _pr(signed x) {cerr << x;}
void _pr(long long x) {cerr << x;}
void _pr(size_t x) {cerr << x;}
void _pr(string &x) {cerr << x;}
void _pr(double x) {cerr << x;}
void _pr(char x) {cerr << '\'' << x << '\'';}
void _pr(const char* x) {cerr << x;}
void _pr(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V> void _pr(const pair<T, V> &x);
template<typename T, typename V> void _pr(const pair<T, V> &x) {cerr << "\e[95m" << "[ "; _pr(x.first); cerr << ", "; _pr(x.second); cerr << "\e[95m" << ']';}
template<typename T> void _pr(const T &x) {int F=0; cerr << '{'; for(auto &i: x) cerr << (F++ ? ", " : ""), _pr(i); cerr << "\e[91m" << '}';}
template <typename T, typename... V> void _pr(T t, V... v) {_pr(t); if(sizeof...(v)) cerr << ", "; _pr(v...);}
#define pr(x...) cerr << "\e[91m" << __func__ << ':' << __LINE__ << " [" << #x << "] = ["; _pr(x); cerr << "\e[91m" << ']' << "\033[0m"  << endl;
mt19937 mt_rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r){return uniform_int_distribution<int>(l, r)(mt_rng);}

//go for outline with ;, then details
int const inf = 1e18, mxn = 1e5+4;
int n, q; 
vo<vo<pii>> adj(mxn);

int solve(int at, int p, int goal, int prevind, int tme){
    if(at==goal) return 1;

    int ret = 0;
    for(auto [x, ind]: adj[at]){
        if(x==p || prevind>ind || ind>tme) continue;
        ret |= solve(x, at, goal, ind, tme);
    }
    return ret;
}

signed main(){
    cin.tie(0)->sync_with_stdio(0);
    cin>>n>>q; 

    int timer = 0;
    vo<array<int, 3>> queries;
    rep(i, 0, n-1+q){
        char t; int a, b; cin>>t;
        if(t=='S'){
            cin>>a>>b; a--, b--;
            adj[a].pb({b, timer}); adj[b].pb({a, timer});
        }   
        else if(t=='Q'){
            cin>>a>>b; a--, b--;
            queries.pb({a, b, timer});
        }
        else{
            cin>>a; a--;
            queries.pb({-1, a, timer});
        }
        timer++;
    }

    for(auto [a, b, tme]: queries){
        if(a==-1) cout << "-1\n";
        else cout << (solve(b, b, a, -1, tme) ? "yes":"no") << "\n";
    }
}

• Subtask 1-1: 2 / 2
• Subtask 1-2: 0 / 3
• Subtask 2-1: 0 / 2
• Subtask 2-2: 0 / 3
• Subtask 3-1: 0 / 5
• Subtask 3-2: 0 / 5
• Subtask 4-1: 0 / 10
• Subtask 4-2: 0 / 10
• Subtask 5-1: 0 / 12
• Subtask 5-2: 0 / 13
• Subtask 6-1: 0 / 17
• Subtask 6-2: 0 / 18