Submission #1280357

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280357		jackofall718	Experimental Charges (NOI19_charges)	C++20	Compilation error	0 ms	0 KiB

charges

#include <bits/stdc++.h>
#include <chrono>
#define ll long long int
#define endl '\n'
#define vn vector<ll>
#define vi vector<pair <ll,ll>>

using namespace std;
using namespace std::chrono;
const int MAX_N = 1e9 + 7;
#define pii pair<ll,ll>
const ll INF = 0x3f3f3f3f3f3f3f3f;

#define pb push_back  
#define srt(vp) sort(vp.begin(), vp.end()) 

vn link;
vector <vn> adj;
vn status;
vn sizes;

ll find (ll n){
    while ( n != link[n])n=link[n];
    return n;
};

ll same(ll x, ll y){
    return find(x)==find(y);
};

void unite(ll x, ll y){
    x = find(x);
    y = find(y);
    if (sizes[x]<sizes[y])swap(x,y);
    sizes[x]+=sizes[y];
    link[y]=x;
    adj[x].insert(adj[x].end(),adj[y].begin(),adj[y].end());//gpt for this impl
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    auto start = high_resolution_clock::now();

    ll n,q;
    cin>>n>>q;
    link.resize(n+1);
    adj.resize(n+1);
    status.resize(n+1,1);
    sizes.resize(n+1);
    for (int i=1;i<=n;i++)sizes[i]=1;
    for (int i=1;i<=n;i++)link[i]=i;
    for (int i=1;i<=n;i++)adj[i].pb(i);
    

    for (int i=0;i<q;i++){
        char a;
        ll b,c;
        cin>>a>>b>>c;
        if (a=='A'){
            if (find(b)==find(c))continue;
            if ((status[b]^1) == status[c]) {
              unite(b,c);
            }
            else{
                b = find(b);
                c= find(c);
                if (sizes[b]<sizes[c])swap(b,c);
                for (auto &x:adj[c])status[x]^=1;
                unite(b,c);

            }

        }
        else if (a=='R'){
            if (find(b)==find(c))continue;
            if (status[b]==status[c]){
                unite(b,c);
            }
            else{
                b = find(b);
                c= find(c);
                if (sizes[b]<sizes[c])swap(b,c);
                for (auto &x:adj[c])status[x]^=1;
                unite(b,c);

            }

        }
        else{
            if (find(b) != find(c))cout<<"?"<<endl;
            else if (status[b]==status[c])cout<<"R"<<endl;
            else cout<<"A"<<endl;

        }
    }



    


    

    auto stop = high_resolution_clock::now();
    auto duration = duration_cast<microseconds>(stop - start);
    //cout << "Time taken by function: " << duration.count() << " microseconds" << endl;

    return 0;
}

Compilation message (stderr)

charges.cpp:17:4: error: 'std::vector<long long int> link' redeclared as different kind of entity
   17 | vn link;
      |    ^~~~
In file included from /usr/include/c++/13/bits/atomic_wait.h:45,
                 from /usr/include/c++/13/bits/atomic_base.h:42,
                 from /usr/include/c++/13/bits/shared_ptr_atomic.h:33,
                 from /usr/include/c++/13/memory:81,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:56,
                 from charges.cpp:1:
/usr/include/unistd.h:819:12: note: previous declaration 'int link(const char*, const char*)'
  819 | extern int link (const char *__from, const char *__to)
      |            ^~~~
charges.cpp: In function 'long long int find(long long int)':
charges.cpp:23:24: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   23 |     while ( n != link[n])n=link[n];
      |                        ^
charges.cpp:23:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   23 |     while ( n != link[n])n=link[n];
      |             ~~^~~~~~~~~~
charges.cpp:23:34: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   23 |     while ( n != link[n])n=link[n];
      |                                  ^
charges.cpp:23:34: error: invalid conversion from 'int (*)(const char*, const char*) noexcept' to 'long long int' [-fpermissive]
   23 |     while ( n != link[n])n=link[n];
      |                            ~~~~~~^
      |                                  |
      |                                  int (*)(const char*, const char*) noexcept
charges.cpp: In function 'void unite(long long int, long long int)':
charges.cpp:36:11: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   36 |     link[y]=x;
      |           ^
charges.cpp:36:12: error: assignment of read-only location '*(link + ((sizetype)y))'
   36 |     link[y]=x;
      |     ~~~~~~~^~
charges.cpp: In function 'int main()':
charges.cpp:48:10: error: request for member 'resize' in 'link', which is of non-class type 'int(const char*, const char*) noexcept'
   48 |     link.resize(n+1);
      |          ^~~~~~
charges.cpp:53:33: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   53 |     for (int i=1;i<=n;i++)link[i]=i;
      |                                 ^
charges.cpp:53:34: error: assignment of read-only location '*(link + ((sizetype)i))'
   53 |     for (int i=1;i<=n;i++)link[i]=i;
      |                           ~~~~~~~^~