結果
問題 | No.1865 Make Cycle |
ユーザー |
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提出日時 | 2022-03-04 22:06:49 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 234 ms / 3,000 ms |
コード長 | 2,184 bytes |
コンパイル時間 | 1,604 ms |
コンパイル使用メモリ | 127,412 KB |
最終ジャッジ日時 | 2025-01-28 05:22:45 |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 20 |
ソースコード
// ===== template.hpp =====#include <algorithm>#include <array>#include <bitset>#include <cassert>#include <cmath>#include <iomanip>#include <iostream>#include <map>#include <numeric>#include <queue>#include <set>#include <stack>#include <string>#include <tuple>#include <unordered_map>#include <unordered_set>#include <utility>#include <vector>#define OVERRIDE(a, b, c, d, ...) d#define REP2(i, n) for (i32 i = 0; i < (i32) (n); ++i)#define REP3(i, m, n) for (i32 i = (i32) (m); i < (i32) (n); ++i)#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)#define PER(i, n) for (i32 i = (i32) (n) - 1; i >= 0; --i)#define ALL(x) begin(x), end(x)using namespace std;using u32 = unsigned int;using u64 = unsigned long long;using u128 = __uint128_t;using i32 = signed int;using i64 = signed long long;using i128 = __int128_t;template <typename T>using Vec = vector<T>;template <typename T>bool chmin(T &x, const T &y) {if (x > y) {x = y;return true;}return false;}template <typename T>bool chmax(T &x, const T &y) {if (x < y) {x = y;return true;}return false;}[[maybe_unused]] constexpr i32 inf = 1000000100;[[maybe_unused]] constexpr i64 inf64 = 3000000000000000100;struct SetIO {SetIO() {ios::sync_with_stdio(false);cin.tie(nullptr);cout << fixed << setprecision(10);}} set_io;// ===== template.hpp =====#ifdef DEBUGF#include "../new_library/other/debug.hpp"#else#define DBG(x) (void) 0#endif#include <atcoder/scc>int main() {i32 n, q;cin >> n >> q;Vec<i32> a(q), b(q);REP(i, q) {cin >> a[i] >> b[i];--a[i];--b[i];}i32 ok = q + 1, ng = 0;while (ok - ng > 1) {i32 mid = (ok + ng) / 2;atcoder::scc_graph scc(n);REP(i, mid) {scc.add_edge(a[i], b[i]);}Vec<Vec<i32>> cmps = scc.scc();if (cmps.size() != n) {ok = mid;} else {ng = mid;}}if (ok == q + 1) {cout << -1 << '\n';} else {cout << ok << '\n';}}