Submission #213577

#	Time	Username	Problem	Language	Result	Execution time	Memory
213577		SamAnd	Monthly railway pass (LMIO18_menesinis_bilietas)	C++17	100 / 100	696 ms	86184 KiB

menesinis_bilietas

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
const int N = 500005;

int n, m;
vector<int> a[N];
vector<pair<int, int> > v;

int k;
int c[N];
void dfs(int x)
{
    c[x] = k;
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i];
        if (!c[h])
            dfs(h);
    }
}

int q[N];
set<int> s[N];

int main()
{
    scanf("%d%d", &n, &m);
    for (int i = 0; i < m; ++i)
    {
        int x, y;
        char ty;
        scanf("%d%d %c", &x, &y, &ty);
        if (ty == 'T')
        {
            a[x].push_back(y);
            a[y].push_back(x);
        }
        else
        {
            v.push_back(m_p(x, y));
        }
    }
    for (int i = 1; i <= n; ++i)
    {
        if (!c[i])
        {
            ++k;
            dfs(i);
        }
    }
    for (int i = 1; i <= n; ++i)
        q[c[i]]++;
    for (int i = 0; i < v.size(); ++i)
    {
        int x = v[i].first;
        int y = v[i].second;
        if (c[x] != c[y])
        {
            s[c[x]].insert(c[y]);
            s[c[y]].insert(c[x]);
        }
    }
    int ans = 0;
    for (int i = 1; i <= k; ++i)
    {
        if (s[i].size() == k - 1)
            ans += q[i];
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

menesinis_bilietas.cpp: In function 'void dfs(int)':
menesinis_bilietas.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~
menesinis_bilietas.cpp: In function 'int main()':
menesinis_bilietas.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < v.size(); ++i)
                     ~~^~~~~~~~~~
menesinis_bilietas.cpp:67:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (s[i].size() == k - 1)
             ~~~~~~~~~~~~^~~~~~~~
menesinis_bilietas.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
menesinis_bilietas.cpp:33:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d %c", &x, &y, &ty);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 6 / 6
• Subtask 3: 30 / 30
• Subtask 4: 35 / 35
• Subtask 5: 19 / 19