oj.uz

답안 #341241

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
341241 2020-12-29T09:32:57 Z AmineWeslati 악어의 지하 도시 (IOI11_crocodile) C++14
46 / 100
 4 ms 3180 KB 
//Never stop trying
/*#pragma GCC target ("avx2")
#pragma GCC optimize ("Ofast")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")*/
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
typedef string str;
typedef double db;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<str> vs;
typedef vector<ld> vd;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX = 1e5 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}

#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}

#ifndef LOCAL
#include "crocodile.h"
#endif

int N;
vpi adj[MX]; 
vi val(MX);

void solve(int u, int p){
	vi vec;
	for(auto v: adj[u]) if(v.fi!=p){
		solve(v.fi,u);
		vec.pb(val[v.fi]+v.se);
	}
	sort(all(vec));
	if(!sz(vec)) val[u]=0;
	else val[u]=vec[1];
}

int travel_plan(int NN, int M, int R[][2], int L[], int K, int P[]){
	N=NN;
	FOR(i,0,N-1){
		int u=R[i][0],v=R[i][1];
		adj[u].pb({v,L[i]});
		adj[v].pb({u,L[i]});
	}
	int r; FOR(i,0,N) if(sz(adj[i])>1){r=i; break;}
	solve(r,r);
	return val[r];
}



#ifdef LOCAL
int main() {
    boost; IO();

    int N,M,K; cin>>N>>M>>K;
    int R[M][2],L[M];
    FOR(i,0,M) cin>>R[i][0]>>R[i][1]>>L[i];
    int P[K];
    FOR(i,0,K) cin>>P[i];
    cout << travel_plan(N,M,R,L,K,P) << endl;
    

    return 0;
}
#endif

/* Careful!!!
    .Array bounds
    .Infinite loops
    .Uninitialized variables / empty containers
    .Multisets are shit

   Some insights:
    .Binary search
    .Graph representation
    .Write brute force code
    .Change your approach
*/

Compilation message

crocodile.cpp: In function 'int travel_plan(int, int, int (*)[2], int*, int, int*)':
crocodile.cpp:91:6: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   91 |  int r; FOR(i,0,N) if(sz(adj[i])>1){r=i; break;}
      |      ^

Subtask #1
46.0 / 46.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3052 KB Output is correct
2 Correct 2 ms 3052 KB Output is correct
3 Correct 3 ms 3052 KB Output is correct
4 Correct 3 ms 3180 KB Output is correct
5 Correct 3 ms 3180 KB Output is correct
6 Correct 3 ms 3180 KB Output is correct
7 Correct 3 ms 3180 KB Output is correct
8 Correct 3 ms 3180 KB Output is correct

Subtask #2
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3052 KB Output is correct
2 Correct 2 ms 3052 KB Output is correct
3 Correct 3 ms 3052 KB Output is correct
4 Correct 3 ms 3180 KB Output is correct
5 Correct 3 ms 3180 KB Output is correct
6 Correct 3 ms 3180 KB Output is correct
7 Correct 3 ms 3180 KB Output is correct
8 Correct 3 ms 3180 KB Output is correct
9 Incorrect 4 ms 3180 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3052 KB Output is correct
2 Correct 2 ms 3052 KB Output is correct
3 Correct 3 ms 3052 KB Output is correct
4 Correct 3 ms 3180 KB Output is correct
5 Correct 3 ms 3180 KB Output is correct
6 Correct 3 ms 3180 KB Output is correct
7 Correct 3 ms 3180 KB Output is correct
8 Correct 3 ms 3180 KB Output is correct
9 Incorrect 4 ms 3180 KB Output isn't correct
10 Halted 0 ms 0 KB -