| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 241396 |
2020-06-24T07:20:19 Z |
kal013 |
Olympic Bus (JOI20_ho_t4) |
C++17 |
|
182 ms |
160000 KB |
/*/ Author: kal013 /*/
// #pragma GCC optimize ("O3")
#include "bits/stdc++.h"
#include "ext/pb_ds/assoc_container.hpp"
#include "ext/pb_ds/tree_policy.hpp"
using namespace std;
using namespace __gnu_pbds;
template<class T>
using ordered_set = tree<T, null_type,less<T>, rb_tree_tag,tree_order_statistics_node_update> ;
template<class key, class value, class cmp = std::less<key>>
using ordered_map = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;
// find_by_order(k) returns iterator to kth element starting from 0;
// order_of_key(k) returns count of elements strictly smaller than k;
template<class T>
using min_heap = priority_queue<T, vector<T> , greater<T> >;
struct custom_hash { // Credits: https://codeforces.com/blog/entry/62393
static uint64_t splitmix64(uint64_t x) {
// http://xorshift.di.unimi.it/splitmix64.c
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
template<class T> ostream& operator<<(ostream &os, vector<T> V) {
os << "[ ";
for(auto v : V) os << v << " ";
return os << "]";
}
template<class T> ostream& operator<<(ostream &os, set<T> S){
os << "{ ";
for(auto s:S) os<<s<<" ";
return os<<"}";
}
template<class T> ostream& operator<<(ostream &os, unordered_set<T> S){
os << "{ ";
for(auto s:S) os<<s<<" ";
return os<<"}";
}
template<class T> ostream& operator<<(ostream &os, ordered_set<T> S){
os << "{ ";
for(auto s:S) os<<s<<" ";
return os<<"}";
}
template<class L, class R> ostream& operator<<(ostream &os, pair<L,R> P) {
return os << "(" << P.first << "," << P.second << ")";
}
template<class L, class R> ostream& operator<<(ostream &os, map<L,R> M) {
os << "{ ";
for(auto m:M) os<<"("<<m.first<<":"<<m.second<<") ";
return os<<"}";
}
template<class L, class R> ostream& operator<<(ostream &os, unordered_map<L,R> M) {
os << "{ ";
for(auto m:M) os<<"("<<m.first<<":"<<m.second<<") ";
return os<<"}";
}
template<class L, class R, class chash = std::hash<R> > ostream& operator<<(ostream &os, gp_hash_table<L,R,chash> M) {
os << "{ ";
for(auto m:M) os<<"("<<m.first<<":"<<m.second<<") ";
return os<<"}";
}
#define TRACE
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
cerr << name << " : " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
const char* comma = strchr(names + 1, ',');
cerr.write(names, comma - names) << " : " << arg1<<" | ";
__f(comma+1, args...);
}
#else
#define trace(...) 1
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
inline int64_t random_long(long long l,long long r){
uniform_int_distribution<int64_t> generator(l,r);
return generator(rng);
}
inline int64_t random_long(){
uniform_int_distribution<int64_t> generator(LLONG_MIN,LLONG_MAX);
return generator(rng);
}
/*/---------------------------Defines----------------------/*/
typedef vector<int> vi;
typedef pair<int,int> pii;
#define ll long long
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(v) (v).begin(),(v).end()
/*/-----------------------Modular Arithmetic---------------/*/
const int mod=1e9+7;
inline int add(int x,int y){
x+=y;
if (x>=mod) return x-mod;
return x;
}
inline int sub(int x,int y){
x-=y;
if (x<0) return x+mod;
return x;
}
inline int mul(int x,int y){
return (x*1ll*y)%mod;
}
inline int power(int x,int y){
int ans=1;
while(y){
if (y&1) ans=mul(ans,x);
x=mul(x,x);
y>>=1;
}
return ans;
}
inline int inv(int x){
return power(x,mod-2);
}
/*/-----------------------------Code begins----------------------------------/*/
const int N = 205;
const int M = 5e4+10;
vector<int> adj[N][2];
const ll INF = 1e15+2;
ll dist[N][N];
ll U[M][2], C[M],D[M];
ll dp[2][N][M][2];
void dijk(int idx,int src,int n,int m){
assert( idx == 0 || idx == 1);
assert(src == 1 || src == n);
int s_id = (src == 1) ? 0 : 1;
vector<ll> dist(n+3,INF),par(n+3,-1);
dist[src] = 0;
min_heap<pair<ll,ll>> queue;
queue.push({0,src});
while(!queue.empty()){
auto X = queue.top();
queue.pop();
if (X.first > dist[X.second]) continue;
// assert(dist[X.second] == X.first);
for(auto i: adj[X.second][idx]){
int v = U[i][0]^U[i][1]^X.second;
if (dist[v] > dist[X.second] + C[i]){
dist[v] = dist[X.second] + C[i];
queue.push({dist[v],v});
par[v] = i;
}
}
}
vector<bool> vis(m+4,false);
vector<int> used, unused;
for(auto e: par){
if (e != -1) {
assert(0 <= e && e < m);
used.push_back(e);
vis[e] = true;
}
}
for(int i = 0; i<m ;++i){
if (!vis[i]){
unused.push_back(i);
}
}
for(auto e: unused){
for(int z = 1; z <= n; ++z){
dp[idx][z][e][s_id] = dist[z];
}
}
assert(used.size() + unused.size() == m);
vector<vector<int> > g(n+1);
for(int i = 1; i <= n; ++i){
if (par[i] != -1){
assert(0 <= par[i] && par[i] < m);
int u = U[par[i]][0]^U[par[i]][1]^i;
g[u].push_back(i);
}
}
for(auto e: used){
int u = U[e][0], v = U[e][1];
if (par[u] == e){
swap(u,v);
}
assert(par[v] == e);
vector<ll> cur_dist(n+1,INF);
cur_dist[src] = 0;
// vector<int> bfs;
// bfs.push_back(v);
// for(int iter = 0 ; iter < bfs.size(); ++iter){
// int cu = bfs[iter];
// cur_dist[cu] = INF;
// for(auto e:g[cu]){
// bfs.push_back(e);
// assert(cur_dist[e] < INF);
// }
// }
min_heap<pair<ll,ll> > cq;
for(int i = 1; i<=n ;++ i){
if (cur_dist[i] < INF){
cq.push({cur_dist[i],i});
}
}
while(!cq.empty()){
auto X = cq.top();
cq.pop();
if (X.first > cur_dist[X.second]) continue;
assert(cur_dist[X.second] == X.first);
for(auto i: adj[X.second][idx]){
if (i == e) continue;
int v = U[i][0]^U[i][1]^X.second;
if (cur_dist[v] > cur_dist[X.second] + C[i]){
cur_dist[v] = cur_dist[X.second] + C[i];
cq.push({cur_dist[v],v});
}
}
}
for(int z = 1; z <= n; ++z){
dp[idx][z][e][s_id] = cur_dist[z];
}
}
}
void solve(){
int n,m;
cin>>n>>m;
assert( n < N && m < M);
for(int i = 1; i<=n ; ++i){
for(int j = 1; j<=n ; ++j){
dist[i][j] = INF;
}
dist[i][i] = 0;
}
for(int i = 0; i < m; ++i){
cin>>U[i][0]>>U[i][1]>>C[i]>>D[i];
ll u = U[i][0], v = U[i][1];
assert(1 <= u && u <= n && 1 <= v && v <= n);
dist[u][v] = min(dist[u][v], C[i]);
adj[u][0].push_back(i);
adj[v][1].push_back(i);
}
for(int mid = 1; mid <= n; ++mid){
for(int src = 1; src <= n; ++src){
for(int des = 1; des <= n ; ++des){
dist[src][des] = min(dist[src][mid] + dist[mid][des],dist[src][des]);
}
}
}
ll ans = min(INF, dist[1][n] + dist[n][1]);
//dijk(0,1,n,m);
//dijk(0,n,n,m);
dijk(1,1,n,m);
//dijk(1,n,n,m);
// for(int i = 0; i < m; ++i){
// ll u = U[i][0], v = U[i][1];
// ll cur_s_t = dp[0][n][i][0];
// cur_s_t = min(cur_s_t, dp[0][v][i][0] + dp[1][u][i][1] + C[i]);
// ll cur_t_s = dp[0][1][i][1];
// cur_t_s = min(cur_t_s, dp[0][v][i][1] + dp[1][u][i][0] + C[i]);
// ans = min(ans, cur_t_s + cur_s_t + D[i]);
// }
if (ans >= INF){
ans = -1;
}
cout<<ans<<endl;
}
int main(){
// Use "set_name".max_load_factor(0.25);"set_name".reserve(512); with unordered set
// Or use gp_hash_table<X,null_type>
ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
cout<<fixed<<setprecision(25);
cerr<<fixed<<setprecision(10);
auto start = std::chrono::high_resolution_clock::now();
int t=1;
// cin>>t;
while(t--) {
solve();
}
auto stop = std::chrono::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::nanoseconds>(stop - start);
// cerr << "Time taken : " << ((long double)duration.count())/((long double) 1e9) <<"s "<< endl;
}
Compilation message
In file included from /usr/include/c++/7/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:45:0,
from /usr/include/c++/7/ext/pb_ds/detail/container_base_dispatch.hpp:90,
from /usr/include/c++/7/ext/pb_ds/assoc_container.hpp:48,
from ho_t4.cpp:4:
ho_t4.cpp: In function 'void dijk(int, int, int, int)':
ho_t4.cpp:208:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
assert(used.size() + unused.size() == m);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
20 ms |
4992 KB |
Output is correct |
| 2 |
Correct |
15 ms |
2688 KB |
Output is correct |
| 3 |
Correct |
23 ms |
4992 KB |
Output is correct |
| 4 |
Correct |
24 ms |
4992 KB |
Output is correct |
| 5 |
Incorrect |
6 ms |
1152 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
182 ms |
159872 KB |
Output is correct |
| 2 |
Incorrect |
177 ms |
160000 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
21 ms |
4992 KB |
Output is correct |
| 2 |
Correct |
20 ms |
2560 KB |
Output is correct |
| 3 |
Correct |
136 ms |
125556 KB |
Output is correct |
| 4 |
Correct |
15 ms |
2560 KB |
Output is correct |
| 5 |
Correct |
169 ms |
159928 KB |
Output is correct |
| 6 |
Correct |
4 ms |
384 KB |
Output is correct |
| 7 |
Correct |
5 ms |
384 KB |
Output is correct |
| 8 |
Incorrect |
128 ms |
159736 KB |
Output isn't correct |
| 9 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
20 ms |
4992 KB |
Output is correct |
| 2 |
Correct |
15 ms |
2688 KB |
Output is correct |
| 3 |
Correct |
23 ms |
4992 KB |
Output is correct |
| 4 |
Correct |
24 ms |
4992 KB |
Output is correct |
| 5 |
Incorrect |
6 ms |
1152 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
