Submission #642669

#	Time	Username	Problem	Language	Result	Execution time	Memory
642669		joshjms	Monthly railway pass (LMIO18_menesinis_bilietas)	C++14	16 / 100	219 ms	53768 KiB

menesinis_bilietas

#include <bits/stdc++.h>
using namespace std;

#define ld long double
#define pb push_back
#define fi first
#define se second
#define debug(x) cout << #x << " => " << x << "\n"

const int mod = 998244353;
const ld E = 1e-4;

struct Edge {
    int u, v;
    char c;
} a[500005];

int n, m, sum;
vector <int> g[500005];

int par[500005], sz[500005];
vector <int> e[500005];

int find(int u) {
    if(u == par[u]) return u;
    return par[u] = find(par[u]);
}

int join(int u, int v) {
    u = find(u);
    v = find(v);
    if(u == v) return 0;
    if(e[u].size() > e[v].size()) {
        par[v] = u;
        sz[u] += sz[v];
        for(auto i : e[v]) e[u].pb(i);
    }
    else {
        par[u] = v;
        sz[v] += sz[u];
        for(auto i : e[u]) e[v].pb(i);
    }
    return 1;
}

int ans[500005];

void solve () {
    cin >> n >> m;
    for(int i = 1; i <= n; i++) {
        par[i] = i;
        sz[i] = 1;
        ans[i] = -1;
    }
    for(int i = 1; i <= m; i++) {
        cin >> a[i].u >> a[i].v >> a[i].c;
    }
    for(int i = 1; i <= m; i++) {
        if(a[i].c == 'A') {
            e[a[i].u].pb(a[i].v);
            e[a[i].v].pb(a[i].u);
        }
    }
    for(int i = 1; i <= m; i++) {
        if(a[i].c == 'T') {
            join(a[i].u, a[i].v);
        }
    }
    for(int i = 1; i <= n; i++) {
        for(int j = 0; j < e[i].size(); j++)
            e[i][j] = find(e[i][j]);
        sort(e[i].begin(), e[i].end());
        e[i].resize(unique(e[i].begin(), e[i].end()) - e[i].begin());
    }
    for(int i = 1; i <= n; i++) {
        int u = find(i);
        if(ans[u] == -1) {
            int s = sz[u];
            for(auto j : e[u]) {
                s += sz[find(j)];
            }
            if(s == n) ans[u] = 1;
            else ans[u] = 0;
        }
        sum += ans[u];
    }
    cout << sum << "\n";
}

signed main () {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    solve ();
}

Compilation message (stderr)

menesinis_bilietas.cpp: In function 'void solve()':
menesinis_bilietas.cpp:70:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |         for(int j = 0; j < e[i].size(); j++)
      |                        ~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 6 / 6
• Subtask 3: 0 / 30
• Subtask 4: 0 / 35
• Subtask 5: 0 / 19