Submission #155842

#	Time	Username	Problem	Language	Result	Execution time	Memory
155842		TAISA_	Dreaming (IOI13_dreaming)	C++14	0 / 100	57 ms	9584 KiB

dreaming

#include "dreaming.h"
#include <bits/stdc++.h>
#define all(vec) vec.begin(), vec.end()
using namespace std;
using ll = long long;
using P = pair<int, int>;
const int INF = (1 << 30) - 1;
const ll LINF = (1LL << 60) - 1LL;
int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    if (M == N - 1) {
        return 0;
    }
    vector<vector<P>> G(N);
    vector<int> vis(N);
    for (int i = 0; i < M; i++) {
        G[A[i]].push_back(P(B[i], T[i]));
        G[B[i]].push_back(P(A[i], T[i]));
    }
    vector<ll> s;
    for (int i = 0; i < N; i++) {
        if (!vis[i] && G[i].size() == 1) {
            vis[i] = 1;
            vector<ll> v;
            int t = G[i][0].first, p = i;
            v.push_back(G[i][0].second);
            while (G[t].size() > 1) {
                vis[t] = 1;
                if (G[t][0].first == p) {
                    v.push_back(G[t][1].second);
                    t = G[t][1].first;
                } else {
                    v.push_back(G[t][0].second);
                    t = G[t][1].first;
                }
            }
            vis[t] = 1;
            vector<ll> sum(v.size() + 1);
            for (int j = 0; j < v.size(); j++) {
                sum[j + 1] = sum[j] + v[j];
            }
            ll mi = LINF;
            for (int j = 0; j <= v.size(); j++) {
                mi = min(mi, max(sum[j], sum[v.size()] - sum[j]));
            }
            s.push_back(mi);
        }
    }
    sort(all(s));
    reverse(all(s));
    ll ans = 0;
    ans = max(ans, s[0] + s[1] + L);
    if (s.size() > 2) {
        ans = max(ans, s[1] + s[2] + 2LL * L);
    }
    return ans;
}

Compilation message (stderr)

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j = 0; j < v.size(); j++) {
                             ~~^~~~~~~~~~
dreaming.cpp:42:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j = 0; j <= v.size(); j++) {
                             ~~^~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 0 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23