#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "garden.h"
using namespace __gnu_pbds;
using namespace std;
template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 3e5 + 10;
vector <pair <int, int>> e[N];
int to[N][30];
//void answer(int x) {
// cout << x << '\n';
//}
void count_routes(int n, int m, int p, int r[][2], int q, int g[]) {
vector <pair <int, int>> edges;
for (int i = 0; i < m; ++i) {
e[r[i][0]].push_back({r[i][1], i << 1});
e[r[i][1]].push_back({r[i][0], i << 1 ^ 1});
edges.push_back({r[i][0], r[i][1]});
edges.push_back({r[i][1], r[i][0]});
}
for (int i = 0; i < m * 2; ++i) {
auto [u, v] = edges[i];
to[i][0] = -1;
for (auto [w, j]: e[v]) {
if (i / 2 == j / 2) continue;
to[i][0] = j;
break;
}
if (to[i][0] == -1) to[i][0] = e[v][0].second;
}
for (int lg = 1; lg <= 29; ++lg) {
for (int i = 0; i < m * 2; ++i)
to[i][lg] = to[to[i][lg - 1]][lg - 1];
}
for (int id = 0; id < q; ++id) {
int x = g[id];
int ans = 0;
for (int r = 0; r < n; ++r) {
int i = e[r][0].second;
for (int lg = 29, y = x; lg >= 0; --lg) {
if (y >= (1 << lg)) {
y -= (1 << lg);
i = to[i][lg];
}
}
if (edges[i].first == p) ++ans;
}
answer(ans);
}
}
//
//int main() {
// int n, m, p;
// cin >> n >> m >> p;
// int r[m][2];
// for (int i = 0; i < m; ++i) {
// int u, v;
// cin >> u >> v;
// r[i][0] = u, r[i][1] = v;
// }
// int q;
// cin >> q;
// int g[q];
// for (int i = 0; i < q; ++i) cin >> g[i];
// count_routes(n, m, p, r, q, g);
//}
Compilation message
garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:32:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
32 | auto [u, v] = edges[i];
| ^
garden.cpp:34:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
34 | for (auto [w, j]: e[v]) {
| ^
garden.cpp:58:9: error: 'answer' was not declared in this scope
58 | answer(ans);
| ^~~~~~
