Submission #1018292

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018292		gutzzy	Traffic (IOI10_traffic)	C++17	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h>
#include "traffic.h"
using namespace std;

vector<int> dp;
vector<vector<int>> lst;
pair<int,int> ans;

int calc(int nodo, int padre, vector<int> &p){
    if(dp[nodo]!=-1) return dp[nodo];
    int res = p[nodo];
    for(auto vecino:lst[nodo]){
        if(vecino!=padre) res += calc(vecino,nodo,p);
    }
    dp[nodo] = res;
    return dp[nodo];
}

void dfs(int nodo, int padre, vector<int> &p){
    dp[padre] = -1;
    int res = 0;
    for(auto vecino:lst[nodo]){
        res = max(res, calc(vecino,nodo,p));
    }
    //cout << "arena: " << nodo << " res: " << res << endl;
    if(res<ans.second){
        //cout << "update!   new arena: " << nodo << " " << res << endl;
        ans.second = res;
        ans.first = nodo;
    }
    for(auto vecino:lst[nodo]){
        if(vecino!=padre) dfs(vecino,nodo,p);
    }
    return;
    
}

int LocateCentre(int n, vector<int> *p, vector<int> *s, vector<int> *d){
    dp = vector<int>(n,-1);
    ans.first = 0;
    ans.second = 2e9;
    lst = vector<vector<int>>(n,vector<int>());
    for(int i=0;i<n-1;i++){
        lst[s[i]].push_back(d[i]);
        lst[d[i]].push_back(s[i]);
    }
    dfs(0,0,p);
    return ans.first;
    
}

/*
int main(){
    cout << LocateCentre(5,{10,10,10,20,20},{0,1,2,3},{2,2,3,4}) << endl;

    return 0;
}
*/

Compilation message (stderr)

traffic.cpp: In function 'int LocateCentre(int, std::vector<int>*, std::vector<int>*, std::vector<int>*)':
traffic.cpp:44:12: error: no match for 'operator[]' (operand types are 'std::vector<std::vector<int> >' and 'std::vector<int>')
   44 |         lst[s[i]].push_back(d[i]);
      |            ^
In file included from /usr/include/c++/10/vector:67,
                 from /usr/include/c++/10/functional:62,
                 from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/10/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from traffic.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:1043:7: note: candidate: 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::reference = std::vector<int>&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]'
 1043 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1043:28: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'}
 1043 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
/usr/include/c++/10/bits/stl_vector.h:1061:7: note: candidate: 'std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::const_reference = const std::vector<int>&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]'
 1061 |       operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1061:28: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'}
 1061 |       operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
traffic.cpp:45:12: error: no match for 'operator[]' (operand types are 'std::vector<std::vector<int> >' and 'std::vector<int>')
   45 |         lst[d[i]].push_back(s[i]);
      |            ^
In file included from /usr/include/c++/10/vector:67,
                 from /usr/include/c++/10/functional:62,
                 from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/10/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from traffic.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:1043:7: note: candidate: 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::reference = std::vector<int>&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]'
 1043 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1043:28: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'}
 1043 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
/usr/include/c++/10/bits/stl_vector.h:1061:7: note: candidate: 'std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::const_reference = const std::vector<int>&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]'
 1061 |       operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1061:28: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'}
 1061 |       operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
traffic.cpp:47:13: error: invalid initialization of reference of type 'std::vector<int>&' from expression of type 'std::vector<int>*'
   47 |     dfs(0,0,p);
      |             ^
traffic.cpp:19:44: note: in passing argument 3 of 'void dfs(int, int, std::vector<int>&)'
   19 | void dfs(int nodo, int padre, vector<int> &p){
      |                               ~~~~~~~~~~~~~^