Submission #39775

#	Time	Username	Problem	Language	Result	Execution time	Memory
39775		nonocut	Bosses (BOI16_bosses)	C++14	0 / 100	0 ms	2316 KiB

bosses

#include<bits/stdc++.h>
using namespace std;

#define ll long long
const int maxn = 5e3 + 5;

int n;
int vis[maxn];
long long val[maxn];
vector<int> way[maxn], p[maxn];
queue<int> q;

void dfs(int u) {
	for(auto v : p[u]) dfs(v), val[u] += val[v];
	val[u]++;
}

ll bfs(int u) {
    int i;
	memset(vis,0,sizeof(vis));
	memset(val,0,sizeof(val));
	for(i=1;i<=n;i++) p[i].clear();

	vis[u] = 1;
	q.push(u);
	while(!q.empty()) {
		int x = q.front(); q.pop();
		for(auto y : way[x]) {
			if(!vis[y]) {
				vis[y] = 1;
				p[x].push_back(y);
				q.push(y);
			}
		}
	}

	dfs(u);
	long long ans = 0;
	for(i=1;i<=n;i++) ans += val[i];
	return ans;
}
int main() {
	int i,x,k;

	scanf("%d",&n);
	for(i=1;i<=n;i++) {
		scanf("%d",&k);
		while(k--) {
			scanf("%d",&x);
			way[x].push_back(i);
		}
	}

	ll ans = (long long)1e18;
	for(i=1;i<=n;i++) ans = min(ans, bfs(i));
	printf("%lld",ans);
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:45:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
bosses.cpp:47:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&k);
                 ^
bosses.cpp:49:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&x);
                  ^

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