Submission #1193674

#	Time	Username	Problem	Language	Result	Execution time	Memory
1193674		omarrrr	City Mapping (NOI18_citymapping)	C++20	Compilation error	0 ms	0 KiB

citymapping

#include "citymapping.h"
#include<bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pb push_back
using namespace std;
bool wchek[1001];
bool vis[1001];
ll link[1001];
struct nd{
    ll a,b,w;
};

vector<pair<ll,ll>>v;
vector<nd>res;

void dfs(ll node,ll p){
    vis[node]=1;
    vector<ll>no;
    if(link[node]>=3)
        return;
    for(ll i=0;i<v.size();i++){
        if(!vis[v[i].S] && wchek[v[i].S]){
           ll d=get_distance(node,v[i].S);
           if(d<v[i].F){
               dfs(v[i].S,node);
               link[node]++;
               res.pb({node,v[i].S,d});
           }else{
               no.pb(v[i].S);
               wchek[v[i].S]=0;
           }
        }
        if(link[node]>=3)
            break;
    }
    for(ll x:no){
        wchek[x]=1;
    }
    return;
}

void find_roads(int n, int Q, int A[], int B[], int W[]) {

    for(ll i=1;i<=1000;i++){
        wchek[i]=true;
        link[i]=0;
    }
    for(ll i=2;i<=n;i++){
        ll d=get_distance(1, i);
        v.pb({d,i});
    }
    sort(v.begin(),v.end());
    ll c=0;

    for(ll i=0;i<n;i++){
        if(!vis[v[i].S]){
            dfs(v[i].S,1);
            A[c]=1;
            B[c]=v[i].S;
            W[c]=v[i].F;


            c++;
            link[1]++;
            link[v[i].F]++;

        }
        if(c>=3)
            break;
    }
    for(ll i=0;i<res.size();i++){
        A[c]=res[i].a;
        B[c]=res[i].b;
        W[c]=res[i].w;
    }



    return;
}

Compilation message (stderr)

citymapping.cpp:10:13: error: 'long long int link [1001]' redeclared as different kind of entity
   10 | ll link[1001];
      |             ^
In file included from /usr/include/x86_64-linux-gnu/bits/sigstksz.h:24,
                 from /usr/include/signal.h:328,
                 from /usr/include/c++/11/csignal:42,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:43,
                 from citymapping.cpp:2:
/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)
      |            ^~~~
citymapping.cpp: In function 'void dfs(long long int, long long int)':
citymapping.cpp:21:17: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   21 |     if(link[node]>=3)
      |                 ^
citymapping.cpp:21:18: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   21 |     if(link[node]>=3)
      |        ~~~~~~~~~~^~~
citymapping.cpp:28:25: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   28 |                link[node]++;
      |                         ^
citymapping.cpp:28:25: warning: ISO C++ forbids incrementing a pointer of type 'int (*)(const char*, const char*) noexcept' [-Wpointer-arith]
   28 |                link[node]++;
      |                ~~~~~~~~~^
citymapping.cpp:28:25: error: lvalue required as increment operand
   28 |                link[node]++;
      |                         ^
citymapping.cpp:35:21: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   35 |         if(link[node]>=3)
      |                     ^
citymapping.cpp:35:22: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   35 |         if(link[node]>=3)
      |            ~~~~~~~~~~^~~
citymapping.cpp: In function 'void find_roads(int, int, int*, int*, int*)':
citymapping.cpp:48:15: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   48 |         link[i]=0;
      |               ^
citymapping.cpp:48:16: error: assignment of read-only location '*(link + ((sizetype)i))'
   48 |         link[i]=0;
      |         ~~~~~~~^~
citymapping.cpp:66:19: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   66 |             link[1]++;
      |                   ^
citymapping.cpp:66:19: warning: ISO C++ forbids incrementing a pointer of type 'int (*)(const char*, const char*) noexcept' [-Wpointer-arith]
   66 |             link[1]++;
      |             ~~~~~~^
citymapping.cpp:66:19: error: lvalue required as increment operand
   66 |             link[1]++;
      |                   ^
citymapping.cpp:67:24: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   67 |             link[v[i].F]++;
      |                        ^
citymapping.cpp:67:24: warning: ISO C++ forbids incrementing a pointer of type 'int (*)(const char*, const char*) noexcept' [-Wpointer-arith]
   67 |             link[v[i].F]++;
      |             ~~~~~~~~~~~^
citymapping.cpp:67:24: error: lvalue required as increment operand
   67 |             link[v[i].F]++;
      |                        ^