#include <bits/stdc++.h>
using namespace std;
#define scd(t) scanf("%d", &t)
#define sclld(t) scanf("%lld", &t)
#define forr(i, j, k) for (int i = j; i < k; i++)
#define frange(i, j) forr(i, 0, j)
#define all(cont) cont.begin(), cont.end()
#define mp make_pair
#define pb push_back
#define f first
#define s second
typedef long long int lli;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<lli> vll;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vi> vvi;
typedef map<int, int> mpii;
typedef set<int> seti;
typedef multiset<int> mseti;
typedef long double ld;
void usaco()
{
freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
// freopen("problem.out", "w", stdout);
}
struct Edge {
int u, v, c, d;
};
int main() {
// usaco();
int n, m;
scd(n);
scd(m);
vector<Edge> vec(m);
vector<seti> graph(n+1);
vector<vll> dist(n+1, vll(n+1, 1e16));
forr(i, 1, n+1) dist[i][i] = 0;
frange(i, m) {
int u, v, c, d;
scd(u);
scd(v);
scd(c);
scd(d);
vec[i].u = u;
vec[i].v = v;
vec[i].c = c;
vec[i].d = d;
dist[u][v] = min(dist[u][v], (lli)c);
graph[u].insert(i);
}
forr(k, 1, n+1) {
forr(i, 1, n+1) {
forr(j, 1, n+1) {
dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
}
}
}
vb inpath(m);
int curr = 1;
if(dist[1][n] < 1e16) {
while(curr != n) {
for(auto e : graph[curr]) {
if(vec[e].c + dist[vec[e].v][n] == dist[vec[e].u][n]) {
curr = vec[e].v;
inpath[e] = true;
}
}
}
}
lli mi = dist[1][n] + dist[n][1];
frange(i, m) {
auto p = vec[i];
lli v = dist[n][p.v] + dist[p.u][1] + p.c + p.d;
if(inpath[i]) {
graph[p.u].erase(i);
graph[p.v].insert(i);
swap(vec[i].u, vec[i].v);
vll dist2(n+1, 1e16);
priority_queue<pair<lli, int>> pq;
pq.push(mp(0, 1));
dist2[1] = 0;
vb vis(n+1);
while(pq.size()) {
auto p = pq.top();
pq.pop();
if(vis[p.s]) continue;
vis[p.s] = true;
for(auto j : graph[p.s]) {
auto e = vec[j];
if(dist2[p.s] + e.c < dist2[e.v]) {
dist2[e.v] = dist2[p.s] + e.c;
pq.push(mp(-dist2[e.v], e.v));
}
}
}
v += dist2[n];
graph[p.v].erase(i);
graph[p.u].insert(i);
swap(vec[i].u, vec[i].v);
}
else {
v += dist[1][n];
}
mi = min(mi, v);
}
inpath = vb(m);
curr = n;
if(dist[n][1] < 1e16)
{while(curr != 1) {
for(auto e : graph[curr]) {
if(vec[e].c + dist[vec[e].v][1] == dist[vec[e].u][1]) {
curr = vec[e].v;
inpath[e] = true;
}
}
}}
frange(i, m) {
auto p = vec[i];
lli v = dist[1][p.v] + dist[p.u][n] + p.c + p.d;
if(inpath[i]) {
graph[p.u].erase(i);
graph[p.v].insert(i);
swap(vec[i].u, vec[i].v);
vll dist2(n+1, 1e16);
priority_queue<pair<lli, int>> pq;
pq.push(mp(0, n));
dist2[n] = 0;
vb vis(n+1);
while(pq.size()) {
auto p = pq.top();
pq.pop();
if(vis[p.s]) continue;
vis[p.s] = true;
for(auto j : graph[p.s]) {
auto e = vec[j];
if(dist2[p.s] + e.c < dist2[e.v]) {
dist2[e.v] = dist2[p.s] + e.c;
pq.push(mp(-dist2[e.v], e.v));
}
}
}
v += dist2[1];
graph[p.v].erase(i);
graph[p.u].insert(i);
swap(vec[i].u, vec[i].v);
}
else {
v += dist[n][1];
}
mi = min(mi, v);
}
if(mi < 1e16) printf("%lld", mi);
else printf("-1");
}
Compilation message
ho_t4.cpp: In function 'void usaco()':
ho_t4.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
30 | freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
ho_t4.cpp:41:5: note: in expansion of macro 'scd'
41 | scd(n);
| ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
ho_t4.cpp:42:5: note: in expansion of macro 'scd'
42 | scd(m);
| ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
ho_t4.cpp:54:9: note: in expansion of macro 'scd'
54 | scd(u);
| ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
ho_t4.cpp:55:9: note: in expansion of macro 'scd'
55 | scd(v);
| ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
ho_t4.cpp:56:9: note: in expansion of macro 'scd'
56 | scd(c);
| ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
ho_t4.cpp:57:9: note: in expansion of macro 'scd'
57 | scd(d);
| ^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
1042 ms |
600 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
55 ms |
4700 KB |
Output is correct |
| 2 |
Correct |
44 ms |
4700 KB |
Output is correct |
| 3 |
Correct |
58 ms |
5052 KB |
Output is correct |
| 4 |
Correct |
8 ms |
860 KB |
Output is correct |
| 5 |
Correct |
8 ms |
604 KB |
Output is correct |
| 6 |
Correct |
7 ms |
600 KB |
Output is correct |
| 7 |
Correct |
7 ms |
604 KB |
Output is correct |
| 8 |
Correct |
0 ms |
348 KB |
Output is correct |
| 9 |
Incorrect |
30 ms |
5032 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
1055 ms |
604 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
1042 ms |
600 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
