Submission #368423

#	Time	Username	Problem	Language	Result	Execution time	Memory
368423		1306439119	Traffic (IOI10_traffic)	C++11	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pi pair<int, int>
#define endl '\n'
#define f first
#define s second

void setIO(string name = "") { 
    ios_base::sync_with_stdio(0); 
	cin.tie(0);     
    if (name.length()) {
        freopen((name+".in").c_str(), "r", stdin); 
        freopen((name+".out").c_str(), "w", stdout);
    }
}

struct node{
    int id, person;
    vector<node*> adj;
    node(int i, int p, vector<node*> a){
        id = i;
        person = p;
        adj = a;
    }
};

int n;
node* A[1000000];

ll dfs(node* curr, int prev){
    ll sum = curr->person;
    for(node* next : curr->adj){
        if(prev != next->id){
            sum += dfs(next, curr->id);
        }
    }
    return sum;
}

ll root(node* root){    
    ll ret = 0;
    for(node* next : root->adj){
        ret = max(ret, dfs(next, root->id));
    }
    return ret;
}

int main(){			 
    setIO("");       
    cin >> n;
    for(int i = 0; i < n; i++){
        int p; cin >> p;
        A[i] = new node(i, p, vector<node*>());
    }

    for(int i = 1; i < n; i++){
        int s, d; cin >> s >> d;
        A[s]->adj.push_back(A[d]);
        A[d]->adj.push_back(A[s]);
    }

    ll res = LLONG_MAX;
    for(int i = 0; i < n; i++){
        res = min(res, root(A[i]));
    }

    cout << res << endl;
    return 0;
}

Compilation message (stderr)

traffic.cpp: In function 'void setIO(std::string)':
traffic.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |         freopen((name+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
traffic.cpp:15:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |         freopen((name+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/ccnZe5WZ.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc1JmozX.o:traffic.cpp:(.text.startup+0x0): first defined here
/tmp/ccnZe5WZ.o: In function `main':
grader.cpp:(.text.startup+0xd9): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status