Submission #1060976

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060976		onbert	Simurgh (IOI17_simurgh)	C++17	30 / 100	83 ms	4204 KiB

simurgh

#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;
const int maxn = 505;
vector<pair<int,int>> adj[maxn];
int vis[maxn], cnt;

vector<int> used;

void dfs(int u) {
    vis[u] = cnt;
    for (auto [v, id]:adj[u]) if (!vis[v]) {
        used.push_back(id);
        dfs(v);
    }
}

vector<int> find_roads(int n, vector<int> U, vector<int> V) {
    for (int i=0;i<U.size();i++) {
        adj[U[i]].push_back({V[i], i}), adj[V[i]].push_back({U[i], i});
    }
    vector<int> golden;
    for (int i=0;i<n;i++) {
        for (int j=0;j<n;j++) vis[j] = 0;
        vis[i] = -1;
        cnt = 0;
        used.clear();
        vector<vector<int>> vec = {{}};
        for (auto [v, id]:adj[i]) {
            if (vis[v]) vec[vis[v]].push_back(id);
            else {
                cnt++, vec.push_back({id});
                dfs(v);
            }
        }
        int ans[U.size()];
        for (int i=0;i<U.size();i++) ans[i] = -1;
        for (int j=1;j<=cnt;j++) {
            vector<int> thing = used;
            for (int k=1;k<=cnt;k++) if (j!=k) thing.push_back(vec[k][0]);
            vector<pair<int,int>> ret;
            int mx = -1;
            for (int v:vec[j]) {
                thing.push_back(v);
                if (ans[v]==-1) {
                    ret.push_back({count_common_roads(thing), v});
                } else {
                    // if (ans[v]==1 && mx == -1) mx = count_common_roads(thing);
                }
                thing.pop_back();
            }
            mx = max(mx, (*max_element(ret.begin(), ret.end())).first);
            for (auto [val, v]:ret) {
                if (val==mx) golden.push_back(v);
                ans[v] = (val==mx);
            }
        }
    }
    sort(golden.begin(), golden.end());
    golden.erase(unique(golden.begin(), golden.end()), golden.end());
    return golden;
}

Compilation message (stderr)

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:19:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i=0;i<U.size();i++) {
      |                  ~^~~~~~~~~
simurgh.cpp:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         for (int i=0;i<U.size();i++) ans[i] = -1;
      |                      ~^~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 17 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30