Submission #776193

#	Time	Username	Problem	Language	Result	Execution time	Memory
776193		MasterTaster	Toll (BOI17_toll)	C++14	0 / 100	1 ms	212 KiB

toll

#include <bits/stdc++.h>

#define ll long long
#define pii pair<int, int>
#define xx first
#define yy second
#define pb push_back

using namespace std;

int n, m, k, q;
map<pair<pii, pii>, ll> dp;

ll resi(int a, int b, int x, int y)
{
	if (dp[{{a, b}, {x, y}}]) return dp[{{a, b}, {x, y}}];
	if ((a+1)==b) return 2000000010;

	int mid=a+(b-a)/2;
	ll ress=2000000010;
	for (int i=0; i<k; i++)
	{
		ress=min(ress, resi(a, mid, x, i)+resi(mid, b, i, y));
	}

	dp[{{a, b}, {x, y}}]=ress;
	return ress;
}

int main(){

#ifndef ONLINE_JUDGE
	freopen("in.txt", "r", stdin);
	freopen("out.txt", "w", stdout);
#endif

	cin>>k>>n>>m>>q;

	for (int i=0; i<m; i++)
	{
		int u, v, t; cin>>u>>v>>t;
		dp[{{u/k, v/k}, {u%k, v%k}}]=t;
	}

	while (q--)
	{
		int u, v; cin>>u>>v;
		int ress=resi(u/k, v/k, u%k, v%k);
		if (ress>=2000000010) cout<<-1<<endl;
		else cout<<ress<<endl;
	}

}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:33:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |  freopen("in.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
toll.cpp:34:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  freopen("out.txt", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44