#include <iostream>
#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
vector<pair<llo,llo>> adj[201];
vector<llo> cost[201];
vector<pair<llo,pair<llo,llo>>> adj2[201];
vector<pair<llo,pair<llo,llo>>> adj3[201];
llo dis[201][201];
llo vis[201];
llo vis2[201];
llo dp[201];
llo dp2[201];
vector<pair<pair<llo,llo>,pair<llo,llo>>> ed;
map<pair<pair<llo,llo>,pair<llo,llo>>,llo> tt;
llo dfs(llo no,llo par=-1,llo po=-1,llo po2=-1){
vis[no]=1;
for(auto nn:adj2[no]){
if(vis[nn.a]==0){
dfs(nn.a,no,nn.b.a,nn.b.b);
dp[no]+=dp[nn.a];
}
else{
dp[no]+=1;
dp[nn.a]-=1;
}
}
if(dp[no]==0){
if(par>-1){
ed.pb({{par,no},{po,po2}});
tt[{{par,no},{po,po2}}]=1;
}
}
}
llo dfs2(llo no,llo par=-1,llo po=-1,llo po2=-1){
vis2[no]=1;
for(auto nn:adj3[no]){
if(vis2[nn.a]==0){
dfs2(nn.a,no,nn.b.a,nn.b.b);
dp2[no]+=dp2[nn.a];
}
else{
dp2[no]+=1;
dp2[nn.a]-=1;
}
}
if(dp2[no]==0){
if(par>-1){
ed.pb({{par,no},{po,po2}});
tt[{{par,no},{po,po2}}]=1;
}
}
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
llo n,m;
memset(dis,-1,sizeof(dis));
memset(vis,0,sizeof(vis));
memset(vis2,0,sizeof(vis2));
memset(dp,0,sizeof(dp));
memset(dp2,0,sizeof(dp2));
cin>>n>>m;
llo ac,bb,cc,dd;
// vector<pair<pair<llo,llo>,pair<llo,llo>>> ed;
// llo kk=1;
for(llo i=0;i<m;i++){
cin>>ac>>bb>>cc>>dd;
adj[ac-1].pb({bb-1,cc});
cost[ac-1].pb(dd);
if(dis[ac-1][bb-1]==-1){
dis[ac-1][bb-1]=cc;
}
dis[ac-1][bb-1]=min(dis[ac-1][bb-1],cc);
}
for(llo i=0;i<n;i++){
dis[i][i]=0;
}
for(llo k=0;k<n;k++){
for(llo i=0;i<n;i++){
for(llo j=0;j<n;j++){
if(dis[i][k]!=-1 and dis[k][j]!=-1){
if(dis[i][j]==-1){
dis[i][j]=dis[i][k]+dis[k][j];
}
else{
dis[i][j]=min(dis[i][j],dis[i][k]+dis[k][j]);
}
}
}
}
}
llo indd=0;
llo indd2=0;
for(llo i=0;i<n;i++){
llo k=0;
for(auto j:adj[i]){
if(dis[0][i]>-1 and dis[j.a][n-1]>-1){
if(dis[0][i]+dis[j.a][n-1]+j.b==dis[0][n-1]){
adj2[i].pb({j.a,{j.b,cost[i][k]}});
indd=j.a;
// cout<<j.a<<" "<<i<<endl;
}
}
if(dis[n-1][i]>-1 and dis[j.a][0]>-1){
if(dis[n-1][i]+dis[j.a][0]+j.b==dis[n-1][0]){
adj3[i].pb({j.a,{j.b,cost[i][k]}});
indd2=j.a;
// cout<<j.a<<","<<i<<endl;
}
}
k+=1;
}
}
dfs(0);
dfs2(n-1);
llo ans=-1;
if(dis[0][n-1]>-1 and dis[n-1][0]>-1){
ans=dis[0][n-1]+dis[n-1][0];
}
/* for(llo i=0;i<ed.size();i++){
cout<<ed[i].a.a<<","<<ed[i].a.b<<" "<<ed[i].b.a<<" "<<ed[i].b.b<<endl;
}*/
for(llo i=0;i<n;i++){
for(llo j=0;j<adj[i].size();j++){
llo nn=adj[i][j].a;
// cout<<i<<" "<<nn<<" "<<adj[i][j].b<<" "<<cost[i][j]<<endl;
if(true){//tt.find({{i,nn},{adj[i][j].b,cost[i][j]}})==tt.end()){
if(dis[i][0]>-1 and dis[0][n-1]>-1 and dis[n-1][nn]>-1){
if(ans==-1){
ans=dis[i][0]+cost[i][j]+dis[n-1][nn]+dis[0][n-1]+adj[i][j].b;
}
ans=min(ans,dis[i][0]+cost[i][j]+dis[n-1][nn]+dis[0][n-1]+adj[i][j].b);
}
if(dis[i][n-1]>-1 and dis[n-1][0]>-1 and dis[0][nn]>-1){
if(ans==-1){
ans=dis[i][n-1]+cost[i][j]+dis[0][nn]+dis[n-1][0]+adj[i][j].b;
}
ans=min(ans,dis[i][n-1]+cost[i][j]+dis[0][nn]+dis[n-1][0]+adj[i][j].b);
}
if(dis[0][nn]>-1 and dis[n-1][nn]>-1 and dis[i][0]>-1 and dis[i][n-1]>0){
if(ans==-1){
ans=dis[0][nn]+dis[n-1][nn]+dis[i][0]+dis[i][n-1]+adj[i][j].b*2+cost[i][j];
}
ans=min(ans,dis[0][nn]+dis[n-1][nn]+dis[i][0]+dis[i][n-1]+adj[i][j].b*2+cost[i][j]);
}
}
else{
continue;
priority_queue<pair<llo,llo>> cc;
llo dist[n];
for(llo i=0;i<n;i++){
dist[i]=-1;
}
dist[0]=0;
cc.push({0,0});
while(!cc.empty()){
pair<llo,llo> bb=cc.top();
cc.pop();
bb.a=-bb.a;
// cout<<bb.b<<" "<<bb.a<<endl;
for(auto jj:adj[bb.b]){
if(dist[jj.a]==-1 or dist[jj.a]>bb.a+jj.b ){
if(bb.b!=i or jj.a!=nn){
dist[jj.a]=bb.a+jj.b;
cc.push({-dist[jj.a],jj.a});
}
}
}
if(bb.b==nn){
if(dist[i]==-1 or dist[i]>dist[bb.b]+adj[i][j].b){
dist[i]=dist[bb.b]+adj[i][j].b;
cc.push({-dist[i],i});
}
}
}
// cout<<dist[n-1]<<endl;
llo dist2[n];
for(llo i=0;i<n;i++){
dist2[i]=-1;
}
dist2[n-1]=0;
cc.push({0,n-1});
while(!cc.empty()){
pair<llo,llo> bb=cc.top();
cc.pop();
bb.a=-bb.a;
for(auto jj:adj[bb.b]){
if(dist2[jj.a]==-1 or dist2[jj.a]>bb.a+jj.b ){
if(bb.b!=i or jj.a!=nn){
dist2[jj.a]=bb.a+jj.b;
cc.push({-dist2[jj.a],jj.a});
}
}
}
if(bb.b==nn){
if(dist2[i]==-1 or dist2[i]>dist2[bb.b]+adj[i][j].b){
dist2[i]=dist2[bb.a]+adj[i][j].b;
cc.push({-dist2[i],i});
}
}
}
// cout<<dist2[0]<<endl;
if(dist[n-1]>-1 and dist2[0]>-1){
if(ans==-1){
ans=dist[n-1]+dist2[0]+cost[i][j];
}
ans=min(ans,dist[n-1]+dist2[0]+cost[i][j]);
}
}
}
}
cout<<ans<<endl;
return 0;
}
Compilation message
ho_t4.cpp: In function 'llo dfs(llo, llo, llo, llo)':
ho_t4.cpp:40:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
ho_t4.cpp: In function 'llo dfs2(llo, llo, llo, llo)':
ho_t4.cpp:59:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:137:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(llo j=0;j<adj[i].size();j++){
~^~~~~~~~~~~~~~
ho_t4.cpp:103:6: warning: variable 'indd' set but not used [-Wunused-but-set-variable]
llo indd=0;
^~~~
ho_t4.cpp:104:6: warning: variable 'indd2' set but not used [-Wunused-but-set-variable]
llo indd2=0;
^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
768 KB |
Output is correct |
| 2 |
Correct |
12 ms |
640 KB |
Output is correct |
| 3 |
Correct |
20 ms |
768 KB |
Output is correct |
| 4 |
Correct |
18 ms |
768 KB |
Output is correct |
| 5 |
Correct |
5 ms |
768 KB |
Output is correct |
| 6 |
Correct |
12 ms |
640 KB |
Output is correct |
| 7 |
Incorrect |
5 ms |
640 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
40 ms |
2552 KB |
Output is correct |
| 2 |
Correct |
39 ms |
2552 KB |
Output is correct |
| 3 |
Correct |
46 ms |
2552 KB |
Output is correct |
| 4 |
Correct |
18 ms |
768 KB |
Output is correct |
| 5 |
Correct |
17 ms |
768 KB |
Output is correct |
| 6 |
Correct |
13 ms |
768 KB |
Output is correct |
| 7 |
Correct |
12 ms |
672 KB |
Output is correct |
| 8 |
Correct |
5 ms |
640 KB |
Output is correct |
| 9 |
Correct |
51 ms |
3704 KB |
Output is correct |
| 10 |
Correct |
53 ms |
3712 KB |
Output is correct |
| 11 |
Correct |
48 ms |
3704 KB |
Output is correct |
| 12 |
Correct |
49 ms |
3584 KB |
Output is correct |
| 13 |
Correct |
47 ms |
3704 KB |
Output is correct |
| 14 |
Correct |
47 ms |
3960 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
768 KB |
Output is correct |
| 2 |
Correct |
14 ms |
640 KB |
Output is correct |
| 3 |
Correct |
36 ms |
4344 KB |
Output is correct |
| 4 |
Correct |
13 ms |
784 KB |
Output is correct |
| 5 |
Correct |
40 ms |
5368 KB |
Output is correct |
| 6 |
Incorrect |
5 ms |
640 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
768 KB |
Output is correct |
| 2 |
Correct |
12 ms |
640 KB |
Output is correct |
| 3 |
Correct |
20 ms |
768 KB |
Output is correct |
| 4 |
Correct |
18 ms |
768 KB |
Output is correct |
| 5 |
Correct |
5 ms |
768 KB |
Output is correct |
| 6 |
Correct |
12 ms |
640 KB |
Output is correct |
| 7 |
Incorrect |
5 ms |
640 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
