Submission #335890

#	Time	Username	Problem	Language	Result	Execution time	Memory
335890		saarang123	Dreaming (IOI13_dreaming)	C++14	Compilation error	0 ms	0 KiB

dreaming

#include <bits/stdc++.h>
#include "dreaming.h"
using namespace std;
using ll = long long;
const int N = 1e5 + 2;
vector<array<ll, 2>> g[N];
bool vis[N];
array<ll, 2> par[N];
vector<array<ll, 2>> cost;

array<ll, 2> dfs(ll v, ll p, ll d) {
    vis[v] = true;
    par[v] = {p, d};
    array<ll, 2> ret = {d, v};
    for(auto tx : g[v]) {
        ll u = tx[0], w = tx[1];
        if(u == p) continue;
        ret = max(ret, dfs(u, v, d + w));
    }
    return ret;
}

ll travelTime(ll N, ll M, ll L, ll A[], ll B[], ll T[]) {
    for(ll i = 0; i < M; i++) {
        g[A[i]].push_back({B[i], T[i]});
        g[B[i]].push_back({A[i], T[i]});
    }
    for(ll i = 0; i < N; i++) {
        if(vis[i]) continue;
        array<ll, 2> x = dfs(i, -1, 0);
        array<ll, 2> d = dfs(x[1], -1, 0);
        array<ll, 2> v = {d[1], d[0]};
        array<ll, 4> ans = {d[0], d[0], 0, d[1]};
        while(v[0] != -1) {
            array<ll, 2> x = {v[0], par[v[0]][1]};
            ans = min(ans, {abs(d[0] - 2 * x[1]), d[0] - x[1], x[1], x[0]});
            v = par[v[0]];
        }
        //cout << ans[1] << ' ' << ans[2] << ' ' << ans[3] << '\n';
        cost.push_back({d[0], ans[3]});
    }
    sort(cost.rbegin(), cost.rend());
    for(ll i = 1; i < cost.size(); i++) {
        g[cost[0][1]].push_back({cost[i][1], L});
        g[cost[i][1]].push_back({cost[0][1], L});
    }
    array<ll, 2> x = dfs(1, -1, 0);
    ll answer = dfs(x[1], -1, 0)[0];
    return answer;
}

Compilation message (stderr)

dreaming.cpp: In function 'll travelTime(ll, ll, ll, ll*, ll*, ll*)':
dreaming.cpp:43:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(ll i = 1; i < cost.size(); i++) {
      |                   ~~^~~~~~~~~~~~~
/tmp/ccClxZSI.o: In function `main':
grader.c:(.text.startup+0xc9): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status