CodingPractice/check.cpp at master · CodeRex7/CodingPractice · GitHub

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#include<bits/stdc++.h>
#definemp make_pair
usingnamespacestd;

intmain()
{
int n;
 cin>>n;
 list< pair<int, int> > *adj;
 adj = new list< pair<int, int> >[n];
for(int i=0;i<n;i++)
 {
int w;
 cin>>w;
 adj[i].push_back(make_pair((i+1)%n, w));
 }
int q;
 cin>>q;
while(q--){
int query;
 cin>>query;
if(query==1){
int a;
int wt;
 cin>>a>>wt;
 set< pair<int,int> >set;
 vector<int>dist(n, INT_MAX);
 set.insert(make_pair(0,a));
 dist[a]=0;

while (!set.empty())
 {
 pair<int, int> tmp = *(set.begin());
 set.erase(set.begin());

int u = tmp.second;

 list< pair<int, int> >::iterator i;
for (i = adj[u].begin(); i != adj[u].end(); ++i)
 {
int v = i->first;
int weight = i->second;
if (dist[v] > dist[u] + weight && v!=a)
 {
if (dist[v] != INT_MAX)
 set.erase(set.find(make_pair(dist[v], v)));

 dist[v] = dist[u] + weight;
 set.insert(make_pair(dist[v], v));
 }
//cout<<dist[u]<<" "<<dist[v]<<" "<<v+1<<endl;
 }
 }
int max=0,pos_max=0;
for(int i=0;i<n;i++){
if(max<dist[i]){
 max=dist[i];
 pos_max=i;
 }
 }
 adj[pos_max].push_back(make_pair(n++, wt));
 }elseif(query==2){
int a;
int wt;
 cin>>a>>wt;
 adj[a].push_back(make_pair(n++, wt));
 }elseif(query==3){
int a;
 cin>>a;
 set< pair<int,int> >set;
 vector<int>dist(n, INT_MAX);
 set.insert(make_pair(0,a));
 dist[a]=0;

while (!set.empty())
 {
 pair<int, int> tmp = *(set.begin());
 set.erase(set.begin());

int u = tmp.second;

 list< pair<int, int> >::iterator i;
for (i = adj[u].begin(); i != adj[u].end(); ++i)
 {
int v = i->first;
int weight = i->second;
if (dist[v] > dist[u] + weight && v!=a)
 {
if (dist[v] != INT_MAX)
 set.erase(set.find(make_pair(dist[v], v)));

 dist[v] = dist[u] + weight;
 set.insert(make_pair(dist[v], v));
 }
//cout<<dist[u]<<" "<<dist[v]<<" "<<v+1<<endl;
 }
 }
int max=0,pos_max=0;
for(int i=0;i<n;i++){
if(max<dist[i]){
 max=dist[i];
 pos_max=i;
 }
 }
//adj[pos_max]=INT_MAX;
 }else{
int a;
 cin>>a;
 set< pair<int,int> >set;
 vector<int>dist(n, INT_MAX);
 set.insert(make_pair(0,a));
 dist[a]=0;

while (!set.empty())
 {
 pair<int, int> tmp = *(set.begin());
 set.erase(set.begin());

int u = tmp.second;

 list< pair<int, int> >::iterator i;
for (i = adj[u].begin(); i != adj[u].end(); ++i)
 {
int v = i->first;
int weight = i->second;
if (dist[v] > dist[u] + weight && v!=a)
 {
if (dist[v] != INT_MAX)
 set.erase(set.find(make_pair(dist[v], v)));

 dist[v] = dist[u] + weight;
 set.insert(make_pair(dist[v], v));
 }
//cout<<dist[u]<<" "<<dist[v]<<" "<<v+1<<endl;
 }
 }
int max=0,pos_max=0;
for(int i=0;i<n;i++){
if(max<dist[i]){
 max=dist[i];
 pos_max=i;
 }
 }
 cout<<max<<endl;
 }
 }
return0;
}