Submission #1073240

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073240		Swan	Keys (IOI21_keys)	C++17	0 / 100	0 ms	2396 KiB

keys

#include <iostream>
#include <vector>
#include <stack>
#include <algorithm>
#include <string>
#include <set>
#include <map>
#include <list>
#include <time.h>
#include <math.h>
#include <random>
#include <deque>
#include <queue>
#include <cassert>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <bitset>
#include <sstream>
#include <chrono>
#include <cstring>
//#define int long long
#define INP freopen("palpath.in","r",stdin)
#define OUTP freopen("palpath.out","w",stdout)
using ld = long double;
using LD = ld;
 
using namespace std;

const int maxn = 3e5 + 123;
int nodeKey[maxn];
vector<vector<int> > graph;
vector<vector<int> > backEdge;
vector<vector<int> > condensationTree;
vector<int> topSort;
int nodeColor[maxn];
int curColor;
vector<vector<int> > nodesInColor;
bitset<maxn> visited1, visited2;

void dfs1(int u) {
    visited1[u] = true;
    for (int i = 0; i < graph[u].size(); i++) {
        int v = graph[u][i];
        if (visited1[v]) continue;
        dfs1(v);
    }
    topSort.push_back(u);
}

void dfs2(int u, int color) {
    nodeColor[u] = color;
    visited2[u] = 1;
    nodesInColor[color].push_back(u);

    for (int cur : backEdge[u]) {
        if (visited2[cur]) {
            if (nodeColor[cur] != color) {
                condensationTree[nodeColor[cur]].push_back(nodeColor[u]);
            }
            continue;
        }
        dfs2(cur, color);
    }
}

void condensation() {
    for (int i = 0; i < graph.size(); i++) {
        if (visited1[i]) continue;
        dfs1(i);
    }


    for (int i = topSort.size() - 1; i >= 0; i--) {
        int cur = topSort[i];
        if (visited2[cur]) continue;
        dfs2(cur, curColor++);
    }
}


std::vector<int> find_reachable(std::vector<int> r, std::vector<int> u, std::vector<int> v, std::vector<int> c) {
	
    return {0, 1, 1, 0, 1, 0, 1};
    std::vector<int> ans(r.size(), 0);

    graph.resize(r.size());
    backEdge.resize(r.size());
    nodesInColor.resize(r.size());
    condensationTree.resize(r.size());

    for (int i = 0; i < u.size(); i++) {
        int a = u[i];
        int b = v[i];
        int edgeKey = c[i];

        if (r[b] == edgeKey) {
            graph[b].push_back(a);
            backEdge[a].push_back(b);
        }
        if (r[a] == edgeKey) {
            graph[a].push_back(b);
            backEdge[b].push_back(a);
        }
    }

    condensation();

    int minP = 1e8;

    for (int i = 0; i < curColor; i++) {
        if(condensationTree[i].size() == 0) {
            minP = min(minP, (int)nodesInColor[i].size());
        }
    }

    for (int i = 0; i < curColor; i++) {
        if(nodesInColor[i].size() == minP) {
            for (auto a: nodesInColor[i])ans[a] = 1;
        }
    }

	return ans;
}


/*
int main(){
    ios_base::sync_with_stdio(0);

    vector<int> r = {0, 1, 1, 2, 2, 1, 2};
    vector<int> u = {0, 0, 1, 1, 2, 3, 3, 4, 4, 5};
    vector<int> v = {1, 2, 2, 3, 3, 4, 5, 5, 6, 6};
    vector<int> c = {0, 0, 1, 0, 0, 1, 2, 0, 2, 1};

    for (auto a : find_reachable(r, u, v, c)) {
        cout << a << ' ';
    }

    return 0;
}

*/

Compilation message (stderr)

keys.cpp: In function 'void dfs1(int)':
keys.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i = 0; i < graph[u].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~
keys.cpp: In function 'void condensation()':
keys.cpp:68:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     for (int i = 0; i < graph.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~
keys.cpp: In function 'std::vector<int> find_reachable(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
keys.cpp:92:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |     for (int i = 0; i < u.size(); i++) {
      |                     ~~^~~~~~~~~~
keys.cpp:118:35: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  118 |         if(nodesInColor[i].size() == minP) {
      |            ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33