Submission #714683

#	Time	Username	Problem	Language	Result	Execution time	Memory
714683		Iliya	Toll (BOI17_toll)	C++17	0 / 100	37 ms	3620 KiB

toll

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 5e4 + 10;
const int Inf = 0x3f3f3f3f;
vector<pair<int, int>> Adj[N];
vector<pair<int, int>> Order;
int k, n, m, o;
void Subtask1() 
{
	vector<int> dp(n);
	for (int i = 0; i < n; i++) 
		for (auto [u, w] : Adj[i]) 
			dp[u] = dp[i] + w;
	for (auto [l, r] : Order)
		printf("%d\n", dp[r] - dp[l]);
}
void Subtask2()
{
	vector<int> dp(n, Inf);
	dp[0] = 0;
	for (int i = 0; i < n; i++) 
	{
		if (dp[i] == Inf) continue;
		for (auto [u, w] : Adj[i]) 
			dp[u] = min(dp[u], dp[i] + w);
	}
	for (auto [l, r] : Order) 
		printf("%d\n", (dp[r] == Inf ? -1 : dp[r]));
}
signed main() 
{	
	scanf("%d%d%d%d", &k, &n, &m, &o);
	for (int i = 0; i < m; i++) 
	{
		int a, b, t;
		scanf("%d%d%d", &a, &b, &t);
		Adj[a].emplace_back(b, t);
	}
	int cnt = 0;
	for (int i = 0; i < o; i++)
	{
		int a, b;
		scanf("%d%d", &a, &b);
		Order.emplace_back(a, b);
		if (a == 0) cnt++;
	}
	if (k == 1) {Subtask1(); return 0;}
	if (cnt == o) {Subtask2(); return 0;} 
	printf("-1");
	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:33:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |  scanf("%d%d%d%d", &k, &n, &m, &o);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:37:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |   scanf("%d%d%d", &a, &b, &t);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~
toll.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |   scanf("%d%d", &a, &b);
      |   ~~~~~^~~~~~~~~~~~~~~~

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