oj.uz

Submission #320119

# Submission time Handle Problem Language Result Execution time Memory
320119 2020-11-07T15:46:35 Z AmineWeslati Duathlon (APIO18_duathlon) C++14
0 / 100
 1000 ms 1048580 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 = 2e5 + 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
}

int N,M;
vi adj[MX];
vpi ed;

bool vis[MX]; 
ll sub[MX];
ll ans=0;

void dfs(int u, int p){
	vis[u]=1;
	sub[u]=1;

	ll sum=0; vi vec;
	for(auto v: adj[u]) if(v!=p){
		dfs(v,u);
		sub[u]=sub[u]+sub[v];
		sum+=sub[v];
		vec.pb(sub[v]);
	}
	for(auto x: vec) ans+=(sum-x)*x;
	ans+=2*((sub[u]-1)*(N-sub[u]));
}

int main() {
    boost; IO();

    cin>>N>>M;
    FOR(i,0,M){
    	int u,v; cin>>u>>v;
    	adj[u].pb(v); adj[v].pb(u);
    }

    FOR(i,1,N+1) vis[i]=0;
    FOR(root,1,N+1) if(!vis[root]){
    	dfs(root,root);
    }
    cout << ans << endl;
    

    return 0;
}

/* 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
*/

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 597 ms 1048580 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 597 ms 1048580 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1101 ms 552460 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5132 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5228 KB Output is correct
4 Correct 4 ms 5228 KB Output is correct
5 Correct 4 ms 5212 KB Output is correct
6 Correct 4 ms 5132 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 5 ms 5084 KB Output is correct
9 Correct 4 ms 5228 KB Output is correct
10 Incorrect 4 ms 5100 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 9228 KB Output is correct
2 Correct 84 ms 9272 KB Output is correct
3 Correct 82 ms 9316 KB Output is correct
4 Correct 76 ms 9188 KB Output is correct
5 Correct 67 ms 9180 KB Output is correct
6 Correct 108 ms 15984 KB Output is correct
7 Correct 78 ms 13872 KB Output is correct
8 Correct 88 ms 12808 KB Output is correct
9 Correct 85 ms 11492 KB Output is correct
10 Incorrect 70 ms 9188 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5248 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Runtime error 885 ms 1048580 KB Execution killed with signal 9 (could be triggered by violating memory limits)
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 9136 KB Output is correct
2 Correct 94 ms 9060 KB Output is correct
3 Execution timed out 1120 ms 934480 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 597 ms 1048580 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 597 ms 1048580 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -