問題：B - Counting Roads #include <iostream> using namespace std; #define REP(i, n) for (int i = 0; i < (n); ++i) int main(void){ int n, m, a, b, road[50]; cin >> n >> m; REP(i, n) { road[i] = 0; } REP(i, m) { cin >> a >> b; road[a - 1]++; road[b - </iostream>…