제출 #668528

#제출 시각아이디문제언어결과실행 시간메모리
6685284EVERCijanobakterije (COCI21_cijanobakterije)C++11
70 / 70
41 ms16696 KiB
/****************************** * author : @hihihihi * * date : 07 / 11 / 2022 * ******************************/ #include <bits/stdc++.h> // #pragma GCC optimize("O2") // #pragma GCC target("avx,avx2,fma") // #pragma GCC optimize ("O3,unroll-loops,no-stack-protector") // #pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") using namespace std; mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); // template #define PB push_back #define ALL(i_) i_.begin(), i_.end() #define LOG2(x_) (31 - __builtin_clz(x_)) #define getBit(x_, i_) ((x_ >> i_) & (ll) 1) #define rd(l_, r_) (l_ + rng() % (r_ - l_ + 1)) #define FOR(i_, a_, b_) for(int i_ = (int) (a_); i_ <= (int) (b_); ++i_) #define FORD(i_, a_, b_) for(int i_ = (int) (a_); i_ >= (int) (b_); --i_) // debugger void __print(int x) {cerr << x;} void __print(long x) {cerr << x;} void __print(long long x) {cerr << x;} void __print(unsigned x) {cerr << x;} void __print(unsigned long x) {cerr << x;} void __print(unsigned long long x) {cerr << x;} void __print(float x) {cerr << x;} void __print(double x) {cerr << x;} void __print(long double x) {cerr << x;} void __print(char x) {cerr << '\'' << x << '\'';} void __print(const char *x) {cerr << '\"' << x << '\"';} void __print(const string &x) {cerr << '\"' << x << '\"';} void __print(bool x) {cerr << (x ? "true" : "false");} template<typename T, typename V> void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';} template<typename T> void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";} void _print() {cerr << "]\n";} template <typename T, typename... V> void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);} #ifndef DEBUG #define debug(x...) cerr << "[" << #x << "] = ["; _print(x) #else #define debug(x...) #endif typedef long long ll; typedef long double ld; template<class X, class Y> bool minimize(X &x, const Y &y){ X eps = 1e-9; if (x > y + eps) { x = y; return 1; } return 0; } template<class X, class Y> bool maximize(X &x, const Y &y) { X eps = 1e-9; if (x + eps < y) { x = y; return 1; } return 0; } template<class T> T Abs(const T &x) { return (x < 0 ? -x : x); } template<class T> using heap_min = priority_queue<T, vector<T>, greater<T>>; template<class T> using heap_max = priority_queue<T>; const int mod = (int) 1e9 + 7; template<class X, class Y> void Add(X &x, const Y &y){ x += y; if(x >= mod) x -= mod; if(x < 0) x += mod; } const int oo = (int) 1e9 + 99; const array<int, 2> dxy8[] = { {-1, 0}, {1, 0}, {0, 1}, {0, -1}, {1, -1}, {1, 1}, {-1, 1}, {-1, -1} }; const array<int, 2> dxy4[] = { {-1, 0}, {1, 0}, {0, 1}, {0, -1} }; const int maxn = (int) 1e5 + 1; const int LOG = (int) LOG2(maxn) + 3; void File(){ #define TASK "CIJANOBAKTERIJE" if(fopen(TASK".inp", "r")) { freopen(TASK".inp", "r", stdin); freopen(TASK".out", "w", stdout); } } int n, m; vector<int> adj[maxn]; void ReadInput(){ cin >> n >> m; FOR(i, 1, m){ int u, v; cin >> u >> v; adj[u].PB(v); adj[v].PB(u); } } int cnt; int vs[maxn], in[maxn], out[maxn]; int child[3][maxn]; void DFS_IN(int u, int par){ vs[u] = cnt; child[1][u] = child[2][u] = (int) -1e7; for(int v : adj[u]) if(v != par){ DFS_IN(v, u); maximize(in[u], in[v] + 1); if(in[v] + 1 > child[1][u]){ child[2][u] = child[1][u]; child[1][u] = in[v] + 1; } else if(in[v] + 1 > child[2][u]){ child[2][u] = in[v] + 1; } } } void DFS_OUT(int u, int par){ if(par != -1){ out[u] = out[par] + 1; if(in[u] + 1 == child[1][par]){ maximize(out[u], child[2][par] + 1); } else{ maximize(out[u], child[1][par] + 1); } } for(int v : adj[u]) if(v != par) DFS_OUT(v, u); } int f[maxn]; void Solve(){ memset(vs, -1, sizeof vs); FOR(i, 1, n) if(vs[i] == -1){ ++cnt; DFS_IN(i, -1); DFS_OUT(i, -1); } int res = 0; FOR(i, 1, n) maximize(f[vs[i]], max(in[i], out[i]) + 1); FOR(i, 1, cnt) res += f[i]; cout << res; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); File(); ReadInput(); Solve(); cerr << "\nTime elapsed: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n"; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'void File()':
Main.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...