Submission #984049

#	Time	Username	Problem	Language	Result	Execution time	Memory
984049		Amaarsaa	Bitaro’s Party (JOI18_bitaro)	C++14	14 / 100	457 ms	37484 KiB

bitaro

#include<bits/stdc++.h>
 
using namespace std;
using ll = int ;
using pll = pair < ll, ll >;
ll used[100004], cant[100004], c[100004];
vector < ll > adj[100004], radj[100004];
vector < pll > good[100003];
int main() {
//	freopen("moocast.in", "r", stdin);
//	freopen("moocast.out", "w", stdout);
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	ll n, m, q, i, ans, x, y, I, I1, i1, t;
 
	cin >> n >> m >> q;
	
	for (i = 1; i <= m; i ++) {
		cin >> x >> y;
		adj[x].push_back(y);
		radj[y].push_back(x);
	}
	for (i = 1; i <= n; i ++) {
		vector < pll > v;
		for ( ll I : radj[i]) {
			i1 = I1 = 0;
			good[i].push_back({0, i});
			used[0] = 1;
			while ( good[i].size() < 100 && (i1 < good[i].size() || I1 < good[I].size())) {
				if (i1 == good[i].size() || (I1 != good[I].size() && good[I][I1].first + 1 >= good[i][i1].first )) {
					good[I][I1].first ++;
					v.push_back(good[I][I1]);
					used[good[I][I1].second] = 1;
					good[I][I1].first --;
					I1 ++;
				}
				else {
					v.push_back(good[i][i1]);
					used[good[i][i1].second] = 1;
					i1 ++;
				}
				while (i1 < good[i].size() && used[good[i][i1].second]) i1 ++;
				while (I1 < good[I].size() && used[good[I][I1].second]) I1 ++;
				
			}
			good[i].pop_back();
			for ( pll A : good[i]) used[A.second] = 0;
			swap(good[i], v);
		}	
		
		
		
	}
	while ( q --) {
		cin >> t >> m;
		for ( i = 1; i <= m; i ++) {
			cin >> c[i];
			cant[c[i]] = 1;
		}
		ans = -1;
		if ( m <= 100) {
			for ( pll &A : good[t]) {
				if (!cant[A.second]) {
					ans = A.first;
					break;
				}
			}
			if (!cant[t]) ans = max(ans, int(0));
		}
		else {
			ll dp[n + 2];
			for (i = 1; i <= n; i ++) dp[i] = -1;
			for (i = 1; i <= n; i ++) {
				if ( cant[i] == 1 && dp[i] == -1) continue;
				dp[i] = max(int(0), dp[i]);
				for ( int I : adj[i]) {
					dp[I] = max(dp[I], dp[i] + 1);
				}
			}
			ans = dp[t];
		}
		for (i =1 ; i <= m; i ++) cant[c[i]] = 0;
		cout << ans << endl;
	}
	/*
	for (i = 1; i <= n; i ++) {
		cout << i << " " << good[i].size() << endl;
		for (pll X : good[i]) {
			cout << X.first << " " << X.second << endl;
		}
		cout << endl;
	}
	*/
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:29:40: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |    while ( good[i].size() < 100 && (i1 < good[i].size() || I1 < good[I].size())) {
      |                                     ~~~^~~~~~~~~~~~~~~~
bitaro.cpp:29:63: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |    while ( good[i].size() < 100 && (i1 < good[i].size() || I1 < good[I].size())) {
      |                                                            ~~~^~~~~~~~~~~~~~~~
bitaro.cpp:30:12: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     if (i1 == good[i].size() || (I1 != good[I].size() && good[I][I1].first + 1 >= good[i][i1].first )) {
      |         ~~~^~~~~~~~~~~~~~~~~
bitaro.cpp:30:37: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     if (i1 == good[i].size() || (I1 != good[I].size() && good[I][I1].first + 1 >= good[i][i1].first )) {
      |                                  ~~~^~~~~~~~~~~~~~~~~
bitaro.cpp:42:15: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     while (i1 < good[i].size() && used[good[i][i1].second]) i1 ++;
      |            ~~~^~~~~~~~~~~~~~~~
bitaro.cpp:43:15: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     while (I1 < good[I].size() && used[good[I][I1].second]) I1 ++;
      |            ~~~^~~~~~~~~~~~~~~~
bitaro.cpp:14:28: warning: unused variable 'I' [-Wunused-variable]
   14 |  ll n, m, q, i, ans, x, y, I, I1, i1, t;
      |                            ^

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86