#line 1 "main.cpp"
/**
* @title Template
*/
#include <iostream>
#include <algorithm>
#include <utility>
#include <numeric>
#include <vector>
#include <array>
#include <queue>
#line 2 "/Users/kodamankod/Desktop/Programming/Library/other/chmin_chmax.cpp"
template <class T, class U>
constexpr bool chmin(T &lhs, const U &rhs) {
if (lhs > rhs) {
lhs = rhs;
return true;
}
return false;
}
template <class T, class U>
constexpr bool chmax(T &lhs, const U &rhs) {
if (lhs < rhs) {
lhs = rhs;
return true;
}
return false;
}
/**
* @title Chmin/Chmax
*/
#line 2 "/Users/kodamankod/Desktop/Programming/Library/other/range.cpp"
#line 4 "/Users/kodamankod/Desktop/Programming/Library/other/range.cpp"
class range {
public:
class iterator {
private:
int64_t M_position;
public:
constexpr iterator(int64_t position) noexcept: M_position(position) { }
constexpr void operator ++ () noexcept { ++M_position; }
constexpr bool operator != (iterator other) const noexcept { return M_position != other.M_position; }
constexpr int64_t operator * () const noexcept { return M_position; }
};
class reverse_iterator {
private:
int64_t M_position;
public:
constexpr reverse_iterator(int64_t position) noexcept: M_position(position) { }
constexpr void operator ++ () noexcept { --M_position; }
constexpr bool operator != (reverse_iterator other) const noexcept { return M_position != other.M_position; }
constexpr int64_t operator * () const noexcept { return M_position; }
};
private:
const iterator M_first, M_last;
public:
constexpr range(int64_t first, int64_t last) noexcept: M_first(first), M_last(std::max(first, last)) { }
constexpr iterator begin() const noexcept { return M_first; }
constexpr iterator end() const noexcept { return M_last; }
constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(*M_last - 1); }
constexpr reverse_iterator rend() const noexcept { return reverse_iterator(*M_first - 1); }
};
/**
* @title Range
*/
#line 2 "/Users/kodamankod/Desktop/Programming/Library/other/rev.cpp"
#include <type_traits>
#include <iterator>
#line 6 "/Users/kodamankod/Desktop/Programming/Library/other/rev.cpp"
template <class T>
class rev_impl {
public:
using iterator = typename std::decay<T>::type::reverse_iterator;
private:
const iterator M_begin;
const iterator M_end;
public:
constexpr rev_impl(T &&cont) noexcept: M_begin(std::rbegin(cont)), M_end(std::rend(cont)) { }
constexpr iterator begin() const noexcept { return M_begin; }
constexpr iterator end() const noexcept { return M_end; }
};
template <class T>
constexpr decltype(auto) rev(T &&cont) {
return rev_impl<T>(std::forward<T>(cont));
}
/**
* @title Reverser
*/
#line 2 "/Users/kodamankod/Desktop/Programming/Library/other/fix_point.cpp"
#line 4 "/Users/kodamankod/Desktop/Programming/Library/other/fix_point.cpp"
template <class Func>
struct fix_point: private Func {
explicit constexpr fix_point(Func &&func): Func(std::forward<Func>(func)) { }
template <class... Args>
constexpr decltype(auto) operator () (Args &&... args) const {
return Func::operator()(*this, std::forward<Args>(args)...);
}
};
template <class Func>
constexpr decltype(auto) make_fix_point(Func &&func) {
return fix_point<Func>(std::forward<Func>(func));
}
/**
* @title Lambda Recursion
*/
#line 18 "main.cpp"
using i32 = int32_t;
using i64 = int64_t;
using u32 = uint32_t;
using u64 = uint64_t;
constexpr i32 inf32 = (i32(1) << 30) - 1;
constexpr i64 inf64 = (i64(1) << 62) - 1;
int main() {
i32 N, M;
std::cin >> N >> M;
std::vector<std::vector<i32>> graph(N);
for (auto i: range(0, M)) {
i32 u, v;
std::cin >> u >> v;
--u; --v;
graph[u].push_back(v);
graph[v].push_back(u);
}
/*
std::vector<std::vector<i32>> count(N);
for (auto i: range(0, N)) {
count[i].resize(graph[i].size());
}
std::vector<bool> visited(N);
i64 ans = 0;
for (auto root: range(0, N)) {
if (visited[root]) {
continue;
}
i32 size = fix_point([&](auto dfs, i32 u) -> i32 {
visited[u] = true;
i32 res = 1;
for (auto i: range(0, graph[u].size())) {
i32 v = graph[u][i];
if (visited[v]) {
continue;
}
count[u][i] = dfs(v);
res += count[u][i];
}
return res;
})(root);
fix_point([&](auto dfs, i32 u, i32 up) -> void {
for (auto i: range(0, graph[u].size())) {
if (count[u][i] == 0) {
count[u][i] = up;
}
else {
dfs(graph[u][i], size - count[u][i]);
}
}
for (auto x: count[u]) {
ans += (i64) x * (size - x - 1);
}
})(root, 0);
}
std::cout << ans << '\n';
// */
i64 ans = 0;
std::vector<bool> visited(N);
for (auto u: range(0, N)) {
if (visited[u]) {
continue;
}
visited[u] = true;
std::queue<i32> queue;
queue.push(u);
i32 n = 0, m = 0;
while (!queue.empty()) {
i32 v = queue.front();
queue.pop();
++n;
for (auto w: graph[v]) {
if (!visited[w]) {
++m;
visited[w] = true;
queue.push(w);
}
}
}
if (n == m) {
ans += (i64) n * (n - 1) * (n - 2);
}
else {
ans += (i64) n * (n - 1) * (n - 2) / 3;
}
}
std::cout << ans << '\n';
return 0;
}
Compilation message
main.cpp: In function 'int main()':
main.cpp:31:13: warning: unused variable 'i' [-Wunused-variable]
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
119 ms |
6136 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
135 ms |
6392 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
123 ms |
6392 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
