結果
問題 | No.2052 Indegree |
ユーザー | llc5pg |
提出日時 | 2022-08-21 16:39:26 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 2 ms / 2,000 ms |
コード長 | 4,556 bytes |
コンパイル時間 | 2,382 ms |
コンパイル使用メモリ | 192,500 KB |
実行使用メモリ | 6,820 KB |
最終ジャッジ日時 | 2024-10-10 06:15:09 |
合計ジャッジ時間 | 2,987 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 2 ms
6,820 KB |
testcase_01 | AC | 2 ms
6,820 KB |
testcase_02 | AC | 2 ms
6,816 KB |
testcase_03 | AC | 2 ms
6,820 KB |
testcase_04 | AC | 2 ms
6,820 KB |
testcase_05 | AC | 2 ms
6,820 KB |
testcase_06 | AC | 2 ms
6,820 KB |
testcase_07 | AC | 2 ms
6,816 KB |
testcase_08 | AC | 2 ms
6,816 KB |
testcase_09 | AC | 2 ms
6,816 KB |
testcase_10 | AC | 2 ms
6,820 KB |
testcase_11 | AC | 2 ms
6,816 KB |
testcase_12 | AC | 2 ms
6,816 KB |
testcase_13 | AC | 2 ms
6,820 KB |
testcase_14 | AC | 2 ms
6,816 KB |
testcase_15 | AC | 2 ms
6,816 KB |
testcase_16 | AC | 2 ms
6,820 KB |
testcase_17 | AC | 2 ms
6,820 KB |
testcase_18 | AC | 2 ms
6,820 KB |
testcase_19 | AC | 2 ms
6,820 KB |
testcase_20 | AC | 2 ms
6,816 KB |
testcase_21 | AC | 2 ms
6,816 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; using ll = long long; //#include <atcoder/modint> //using namespace atcoder; //using mint = modint998244353; # define M_PI 3.14159265358979323846 /* pi */ #pragma GCC target ("avx2") #pragma GCC optimization ("O3") const int MOD = (1e9+7); template < typename T = int > ostream& operator << (ostream &out, const vector < T > &v){ for (const T &x: v) out << x << ' '; return out; } void printmat(const vector<vector<int>>& mat) { for (auto row : mat) { for (auto elem : row) cout << elem << " "; cout << "\n"; } } void printdq(const deque<int>& v) { for (auto elem : v) cout << elem << " "; cout << endl; } void printv(const vector<int>& v) { for (auto elem : v) cout << elem << " "; cout << "\n"; } void printvll(const vector<ll>& v) { for (auto elem : v) cout << elem << " "; cout << endl; } void printd(const deque<int>& v) { for (auto elem : v) cout << elem << " "; cout << endl; } void printvp(const vector<pair<char,int>>& vp) { for (auto pr : vp) { cout << pr.first << ", " << pr.second; cout << endl; } } void printvs(const vector<set<int>>& vs) { for (auto row : vs) { for (auto elem : row) cout << elem << ", "; cout << endl; } } void printht(const unordered_map<int, int>& ht) { for (auto elem : ht) cout << elem.first << " : " << elem.second << endl; } void printmp(const map<int, int>& ht) { for (auto elem : ht) cout << elem.first << " : " << elem.second << endl; } void printst(const set<int>& st) { for (auto elem : st) cout << elem << " "; cout << endl; } bool isPrime(long long n) { if (n <= 1) return false; if (n <= 3) return true; if (n % 2 == 0 || n % 3 == 0) return false; for (long long i = 5; i * i <= n; i = i + 6) if (n % i == 0 || n % (i + 2) == 0) return false; return true; } map<long long, long long> primeFactors(long long n) { map<long long, long long> ans; while (n % 2 == 0) { ans[2]++; n = n/2; } for (long long i = 3; i*i <= (n); i = i + 2) { while (n % i == 0) { ans[i]++; n = n/i; } } if (n > 2) ans[n]++; return ans; } int find_f(const vector<int>& uf, int i) { while (uf[i]!=i) i = uf[i]; return i; } bool union_f(vector<int>& uf, vector<int>& sz, int a, int b) { a = find_f(uf, a); b = find_f(uf, b); //cout << "a, b = " << a << ", " << b << endl; if (a==b) return false; if (sz[a] < sz[b]) { //cout << "sz[a], sz[b] = " << sz[a] << ", " << sz[b] << endl; //cout << "a, b = " << a << ", " << b << endl; swap(a,b); //cout << "a, b = " << a << ", " << b << endl; } sz[a] += sz[b]; uf[b] = a; return true; } long long modexp(long long b, long long e, long long M) { if (!e) return 1; b %= M; long long x = modexp(b * b % M, e / 2, M); if (e % 2) { return b * x % M; } else { return x; } } ll gcdExtended(ll a, ll b, ll* x, ll* y) { if (a == 0) { *x = 0, *y = 1; return b; } ll x1, y1; ll gcd = gcdExtended(b % a, a, &x1, &y1); *x = y1 - (b / a) * x1; *y = x1; return gcd; } ll modInverse(ll a, ll m) { ll x, y, res=-1; ll g = gcdExtended(a, m, &x, &y); if (g != 1) cout << "Inverse doesn't exist"; else { // m is added to handle negative x res = (x % m + m) % m; } return res; } int lenOfLIS(vector<int>& v) { int n = v.size(), len = 0; vector<int> dp(n,0); for (int num : v) { int i = lower_bound(dp.begin(), dp.begin()+len, num) - dp.begin(); dp[i] = num; if (i == len) { len++; } } return len; } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); int T=1, caseIdx=0; //cin >> T; while (T--) { //caseIdx++; int n, m, ans=0; cin >> n >> m; vector<int> indegree(n); for (int i=0; i<m; i++) { int a, b; cin >> a >> b; a--; b--; indegree[b]++; } for (int i=0; i<n; i++) { if (indegree[i]==0) ans++; } cout << ans << "\n"; //cout << "Case #" << caseIdx << ": " << ans << "\n"; } }