Submission #255552

#	Time	Username	Problem	Language	Result	Execution time	Memory
255552		Hehehe	Toy Train (IOI17_train)	C++14	Compilation error	0 ms	0 KiB

train

#include "train.h"
#include<bits/stdc++.h> //:3
using namespace std;
typedef long long ll;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pi pair<long double, long double>
#define sz(x) (int)((x).size())

const int N = 5e3 + 11;
int n, m;
int ok[N], DEG[N], deg[N], a[N], r[N], viz[N], station[N], prev[N], flag;
vector<int>adj[N];
 
void bfs(){
    
    for(int i = 0; i < n; i++){
        viz[i] = 0;
        prev[i] = ok[i];
        station[i] = 1;
        deg[i] = DEG[i];
    }
    
    queue<int>q;
    
    for(int i = 0; i < n; i++){
        if(!ok || !r[i])continue;
        
        station[i] = 1;
        
        for(auto it : adj[i]){
            if(viz[it])continue;
        
            if(a[it] || !(--deg[it])){
                viz[it] = 1;
                q.push(it);
            }
        }
    }
    
    for(int i = 0; i < n; i++)ok[i] = 0;
    
    while(!q.empty()){
        
        int i = q.front();
        q.pop();
        
        ok[i] = 1;
        if(station[i])continue;
        
        for(auto it : adj[i]){
            if(viz[it])continue;
        
            if(a[it] || !(--deg[it])){
                viz[it] = 1;
                q.push(it);
            }
        }
    }
    
    int fl = 0;
    for(int i = 0; i < n; i++){
        if(ok[i] != prev[i])fl = 1;
    }
    
    if(!fl)flag = 1;
}
 
vector<int> who_wins(vector<int> A, vector<int> R, vector<int> u, vector<int> v){
   
    n = sz(A);
    m = sz(u);
    
    for(int i = 0; i < n; i++){
        r[i] = R[i];
        a[i] = A[i];
    }
    
    for(int i = 0; i < m; i++){
        adj[v[i]].push_back(u[i]);
    }
    
    for(int i = 0; i < n; i++){
        for(auto it : adj[i]){
            DEG[it]++;
        }
    }
    
    memset(ok, 1, sizeof(ok));
    
    for(int i = 0; i < n && !flag; i++){
        bfs();
    }

    vector<int> res;
    for(i = 0;i < n; i++){
        res.push_back(ok[i]);
    }
        
    return res;
}

Compilation message (stderr)

train.cpp: In function 'void bfs()':
train.cpp:22:9: error: reference to 'prev' is ambiguous
         prev[i] = ok[i];
         ^~~~
train.cpp:15:60: note: candidates are: int prev [5011]
 int ok[N], DEG[N], deg[N], a[N], r[N], viz[N], station[N], prev[N], flag;
                                                            ^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/7/vector:60,
                 from train.h:1,
                 from train.cpp:1:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:220:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^~~~
train.cpp:66:21: error: reference to 'prev' is ambiguous
         if(ok[i] != prev[i])fl = 1;
                     ^~~~
train.cpp:15:60: note: candidates are: int prev [5011]
 int ok[N], DEG[N], deg[N], a[N], r[N], viz[N], station[N], prev[N], flag;
                                                            ^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/7/vector:60,
                 from train.h:1,
                 from train.cpp:1:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:220:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^~~~
train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:99:9: error: 'i' was not declared in this scope
     for(i = 0;i < n; i++){
         ^