Submission #96003

#	Time	Username	Problem	Language	Result	Execution time	Memory
96003		bash	Bosses (BOI16_bosses)	C++17	67 / 100	1556 ms	39688 KiB

bosses

/**
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*/
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>

#define F first
#define S second
#define endl '\n'
#define deb(x) cout<<#x<<' '<<x<<endl;
#define pb push_back


#ifdef IZI_KATKA
#define int __int64_t
#else
#define int __int64_t
#endif

const long long MOD = 1e18 + 7;
const long long MAXN = 1e6 + 1;
using namespace std;

typedef long long ll;

long long readInt() {
    bool minus1 = false;
    long long result = 0;
    char ch;
    ch = getchar();
    while (true) {
        if (ch == '-') break;
        if (ch >= '0' && ch <= '9') break;
        ch = getchar();
    }
    if (ch == '-') minus1 = true; else result = ch-'0';
    while (true) {
        ch = getchar();
        if (ch < '0' || ch > '9') break;
        result = result*10 + (ch - '0');
    }
    if (minus1)
        return -result;
    else
        return result;
}

int ans[MAXN];
int used[MAXN];
vector <int> g[MAXN];
int par[MAXN];
int n;
vector<int> vec;


int bfs(int s) {
	memset(used, 0, sizeof(used));
	memset(ans, 0, sizeof(ans));
	queue<int> q;
	vec.clear();
	q.push (s);
	used[s] = true;
	par[s] = -1;
	while (!q.empty()) {
		int v = q.front();
		q.pop();
		vec.push_back(v);
		for (size_t i=0; i<g[v].size(); ++i) {
			int to = g[v][i];
			if (!used[to]) {
				used[to] = true;
				q.push (to);

				par[to] = v;
			}
		}
	}
	if(vec.size() != n) return MOD;
	int tot = 0;
	for (int i = vec.size() - 1; i >= 0; i--) {
		ans[vec[i]]++;
		tot += ans[vec[i]];
		if (par[vec[i]] != -1) {
			ans[par[vec[i]]] += ans[vec[i]];
		}
	}	
	return tot;
}

main() {
	#ifdef IZI_KATKA
	assert(freopen("input", "r", stdin));
    assert(freopen("output", "w", stdout));
    #endif
    n = readInt();
    for (int i = 1; i <= n; i++) {
    	int m = readInt();
    	for (int j = 1; j <= m; j++) {
    		int x = readInt();
    		g[x].pb(i);
    	}
    }
    int res = MOD;
    for (int i = 1; i <= n; i++) {
		res = min(res, bfs(i));    	
    }
    cout << res;
    return 0;
}

Compilation message (stderr)

bosses.cpp: In function '__int64_t bfs(__int64_t)':
bosses.cpp:97:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(vec.size() != n) return MOD;
     ~~~~~~~~~~~^~~~
bosses.cpp: At global scope:
bosses.cpp:109:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 0 / 33