I was trying 893C - Rumor. My submission is 367279083 in C++. I got a WA8, but I don't understand why. Someone please help. Code:

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

void solve() {
    int n, m;
    long long r = 0;
    cin >> n >> m;
    vector<int> v(n);
    vector<pair<int, bool>> x(n, {0, false});
    for (int i = 0; i < n; i++) cin >> v[i];
    for (int i = 0; i < n; i++) x[i].first = i + 1;
    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        if (v[b - 1] < v[a - 1]) x[a - 1].first = b;
        else x[b - 1].first = a;
    }
    map<int, int> ma;
    vector<int> fi;
    for (int i = 0; i < n; i++) {
        int ind = i;
        if (x[i].second == false) {
            while (x[ind].first != ind + 1) {
                x[ind].second = true;
                ind = x[ind].first - 1;
            }
            ma[ind]++;
            if (ma[ind] == 1) fi.push_back(ind);
        }
    }
    for (int i = 0; i < fi.size(); i++) r += v[fi[i]];
    cout << r << endl;
}

int main() {
    int t = 1;
    //cin >> t;
    while (t--) solve();
}