oj.uz

Submission #708083

# Submission time Handle Problem Language Result Execution time Memory
708083 2023-03-11T04:20:39 Z cig32 Training (IOI07_training) C++17
30 / 100
 3 ms 720 KB 
#include "bits/stdc++.h"
using namespace std;
#define int long long
const int MAXN = 2e5 + 10;
const int MOD = 1e9 + 7;
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
int bm(int b, int p) {
  if(p==0) return 1 % MOD;
  int r = bm(b, p >> 1);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
int inv(int b) { 
  return bm(b, MOD-2);
}
int fastlog(int x) {
  return (x == 0 ? -1 : 64 - __builtin_clzll(x) - 1);
}
void printcase(int i) { cout << "Case #" << i << ": "; }

void solve(int tc) {
  int n, m;
  cin >> n >> m;
  vector<int> chain[n+1];
  vector<pair<int,int> > adj[n+1];
  int tcost = 0;
  for(int i=0; i<m; i++) {
    int a, b, c;
    cin >> a >> b >> c;
    if(a == b) continue;
    tcost += c;
    if(c == 0) {
      chain[a].push_back(b);
      chain[b].push_back(a);
    }
    else {
      adj[a].push_back({b, c});
      adj[b].push_back({a, c});
    }
  }
  vector<int> ord;
  int st;
  for(int i=1; i<=n; i++) if(chain[i].size() == 1) st = i;
  ord.push_back(st);
  int vis[n+1];
  for(int i=1; i<=n; i++) vis[i] = 0;
  for(int i=1; i<n; i++) {
    vis[st] = 1;
    for(int x: chain[st]) {
      if(!vis[x]) {
        st = x; break;
      }
    }
    ord.push_back(st);
  }
  int dp[n+1];
  for(int i=1; i<=n; i++) dp[i] = vis[i] = 0;
  int ma = 0;
  int it = 0;
  for(int x: ord) {
    vis[x] = ++it;
    for(pair<int, int> y: adj[x]) {
      if(vis[y.first] > 0 && (vis[x] - vis[y.first]) % 2 == 0) {
        for(int j=0; j<vis[y.first]; j++) dp[x] = max(dp[x], dp[ord[j]] + y.second);
      }
    }
    ma = max(ma, dp[x]);
  }
  cout << tcost - ma << '\n';
}

int32_t main() {
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
}
/*
6 7
1 2 0
2 3 0
3 4 0
4 5 0
5 6 0
1 3 2
4 6 1
*/

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 324 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 212 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 460 KB Output is correct
2 Correct 2 ms 468 KB Output is correct

Subtask #4
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 464 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 720 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 412 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 716 KB Output isn't correct
2 Halted 0 ms 0 KB -