Submission #1227868

#	Time	Username	Problem	Language	Result	Execution time	Memory
1227868		voidheart	Bitaro’s Party (JOI18_bitaro)	C++20	100 / 100	1326 ms	148608 KiB

bitaro

/*
 
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*/
 
#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define endl '\n'
#define rep(i,a,b) for(int i=a; i<=b; ++i)
#define rev(i,a,b) for(int i=a; i>=b; --i)
#define getbit(mask,i) (1ll&(mask>>i))
#define all(v) (v).begin(),(v).end()
#define isz(v) (int)(v).size()
#define pii pair<int,int>
using namespace std;
const ll inf = 998244353;
const ll pvhmod =  1e9 [phone];
const ll moreinf = 1e18 + 7;
const ll base = 256;
const ll mod = (1ll<<31) - 1;
const int sz = 100;
 
inline ll CELL(ll a, ll b){return a/b + (a%b>0);}
inline ll FLOOR(ll a, ll b){return a/b - (a%b<0);}
 
const int maxN = 1e5+7;

int n,m,q;
vector<int> g[maxN];
vector<pii> longest_path[maxN];

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);  
    if(fopen("code.inp","r")){
        freopen("code.inp","r",stdin);
        freopen("code.out","w",stdout);
    }

    cin >> n >> m >> q;
    rep(i,1,m){
        int u,v; cin >> u >> v;
        g[v].push_back(u);
    }

    vector<int> found(n+2,0),cur_longest(n+2,0), processed;

    rep(u,1,n){
        longest_path[u].push_back({0,u});
        
        for(int v:g[u]){
  
            for(pii p:longest_path[v]){
                int idx = p.second, len = p.first;
                if(!found[idx]){
                    processed.push_back(idx);
                    found[idx] = 1;
                    cur_longest[idx] = len + 1;
                }else{
                    cur_longest[idx] = max(cur_longest[idx], len + 1);
                }
            }
        }

        for(int x:processed) longest_path[u].push_back({cur_longest[x],x});
        sort(longest_path[u].rbegin(), longest_path[u].rend());

        while(isz(longest_path[u])>sz + 3) longest_path[u].pop_back();

        for(int x:processed) cur_longest[x] = found[x] = 0; 
        //
        processed.clear();
    }

    // rep(u,1,n){
    //     cout << u << endl;
    //     for(pii p:longest_path[u]) cout << p.first << " " << p.second << endl;
    // }

    while(q--){
        int t,y; cin >> t >> y;
        int ans = -1;

        vector<int> blocked(n+2,0);
        rep(i,1,y){
            int x; cin >> x;
            blocked[x] = 1;
        }

        if(y>sz){
            vector<int> dp(n+2,-1);
            dp[t] = 0;
            rev(u,t,1){
                if(dp[u]==-1) continue;
                for(int v:g[u]) dp[v] = max(dp[v],dp[u] + 1);
                if(!blocked[u]) ans = max(ans, dp[u]);
            }
        }else{
            for(pii p:longest_path[t]){
                if(!blocked[p.second]) {
                    ans = p.first; 
                    break;
                };
            }
        }
        cout << ans << endl;
    }
    
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
    return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen("code.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen("code.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 86 / 86