Submission #517170

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
517170	2022-01-22T16:17:12 Z	Ai7081	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KB

supertrees

#include <bits/stdc++.h>
using namespace std;
const int N = 1005;

int cnt;
vector<int> ret, sub;
vector<vector<int>> adj;

void dfs(int v, int p, bool ismax) {
    ret[v] = cnt;
    cnt += (!ismax);
    sub[v] = 1;
    for (auto to : adj[v]) {
        if (to == p) continue;
        dfs(to, v, !ismax);
        if (ismax) ret[v] += sub[to];
        sub[v] += sub[to];
    }
    cnt += ismax;
    return;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    adj.assign(n, vector<int>());
    for (int i=0; i<n-1; i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    sub.assign(n, 0);
    ret.assign(n, 0);
    dfs(0, 0, 0);
    return ret;
}

int find_next_station(int s, int t, vector<int> c) {
    bool ismax = (s > c[0]);
    if (ismax) {
        if (t > s) return c[0];
        for (int i=1; i<c.size(); i++) {
            if (t < c[i]) return c[i-1];
        }
        return c[c.size()-1];
    }
    else {
        if (t < s) return c[c.size()-1];
        for (int i=0; i<c.size()-1; i++) {
            if (t > c[i]) return c[i+1];
        }
        return c[0];
    }
    return -1;
}

Compilation message

supertrees.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
supertrees.cpp:39:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         for (int i=1; i<c.size(); i++) {
      |                       ~^~~~~~~~~
supertrees.cpp:46:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         for (int i=0; i<c.size()-1; i++) {
      |                       ~^~~~~~~~~~~
/usr/bin/ld: /tmp/ccux7p9A.o: in function `main':
grader.cpp:(.text.startup+0x39a): undefined reference to `construct(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
collect2: error: ld returned 1 exit status