# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
867149 |
2023-10-27T18:53:24 Z |
bobbilyking |
Toll (BOI17_toll) |
C++17 |
|
72 ms |
18160 KB |
#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include<bits/stdc++.h>
#include<math.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
typedef pair<ll, ll> pl;
#define K first
#define V second
#define G(x) ll x; cin >> x;
#define GD(x) ld x; cin >> x;
#define GS(s) string s; cin >> s;
#define EX(x) { cout << x << '\n'; exit(0); }
#define A(a) (a).begin(), (a).end()
#define F(i, l, r) for (ll i = (l); i < r; ++i)
#define NN 50010
#define M 1000000007 // 998244353
vector<pl> adj[NN];
vector<pl> radj[NN];
ll ans[NN], l[NN], r[NN];
ll k;
ll n;
// returns array of size r-l+1, indexed with l
vector<ll> dij(ll l, ll r, ll v, const vector<pl> (&adj)[NN]) {
vector<ll> dist(r-l+1, 1e18); v-=l;
dist[v] = 0;
priority_queue<pl, vector<pl>, greater<pl>> pq;
pq.emplace(0, v);
while (pq.size()) {
auto [d, h] = pq.top(); pq.pop();
assert(h < dist.size());
if (d != dist[h]) continue;
for (auto [x, w]: adj[h]) {
x-=l;
assert(x < dist.size());
if (d + w < dist[x]) {
dist[x] = d + w;
pq.emplace(dist[x], x);
}
}
}
return dist;
}
void solve(ll lb, ll rb, vector<ll>& q) {
if (lb >rb) return;
if (lb == rb) {
// All queries are just zero
for (auto x: q) ans[x] = 0;
return;
}
vector<ll> lq, rq;
ll m = (lb+rb)/2;
// construct radj on the fly
F(i, lb, rb+1) radj[i].clear();
F(i, lb, rb+1) for (auto [x, w]: adj[i]) if (lb <= x and x <= rb) radj[x].emplace_back(i, w);
// All queries will pass through the roads m-k, m+k
F(thru, max(lb, m-k-1), min(rb, m+k+1)+1) {
auto out = dij(lb, rb, thru, adj);
auto in = dij(lb, rb, thru, radj);
for (auto i: q) ans[i] = min(ans[i], in[l[i]-lb] + out[r[i]-lb]);
}
// Remove all edges that "cross over"
F(i, lb, m) {
vector<pl> nadj;
copy_if(A(adj[i]), back_inserter(nadj), [m](const auto &x) {return x.K < m;});
swap(adj[i], nadj);
}
F(i, m+1, rb) {
vector<pl> nadj;
copy_if(A(adj[i]), back_inserter(nadj), [m](const auto &x) {return x.K > m;});
swap(adj[i], nadj);
}
for (auto i: q) {
if (r[i] < m) lq.push_back(i);
else if (m < l[i]) rq.push_back(i);
}
solve(lb, m-1, lq);
solve(m+1, rb, rq);
}
int main(){
// freopen("a.in", "r", stdin);
// freopen("a.out", "w", stdout);
ios_base::sync_with_stdio(false); cin.tie(0);
cout << fixed << setprecision(20);
cin >> k >> n;
G(m) G(o)
vector<ll> q;
while(m--){
G(a) G(b) G(x) adj[a].emplace_back(b, x);
}
ll inf = 1e18;
F(i, 0, o) {
cin >> l[i] >> r[i]; q.push_back(i);
ans[i] =inf;
}
solve(0, n-1, q);
F(i, 0, o) cout << (ans[i] == inf ? -1: ans[i]) << '\n';
}
Compilation message
In file included from /usr/include/c++/10/cassert:44,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
from toll.cpp:5:
toll.cpp: In function 'std::vector<long long int> dij(ll, ll, ll, const std::vector<std::pair<long long int, long long int> > (&)[50010])':
toll.cpp:41:18: warning: comparison of integer expressions of different signedness: 'std::tuple_element<1, std::pair<long long int, long long int> >::type' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
41 | assert(h < dist.size());
| ~~^~~~~~~~~~~~~
toll.cpp:45:22: warning: comparison of integer expressions of different signedness: 'std::tuple_element<0, std::pair<long long int, long long int> >::type' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
45 | assert(x < dist.size());
| ~~^~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
35 ms |
14868 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
72 ms |
18160 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
5 ms |
7260 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
5 ms |
7260 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
35 ms |
14868 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |