oj.uz

Submission #1024877

# Submission time Handle Problem Language Result Execution time Memory
1024877 2024-07-16T11:42:05 Z ach00 Graph (BOI20_graph) C++14
0 / 100
 1 ms 2796 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long double ld;
#define A first
#define X second
#define EPS 0.00001
int n,m;
vector<ld> ans(100005, numeric_limits<ld>::max());
vector<vector<pair<int,int>>> adj; 
vector<pair<int,int>> prelim(100005, {0, 0});
vector<int> arrthing;
ld start_value = numeric_limits<ld>::max();

void explore(int v, int p) {
    if(prelim[v].X == 0) {
        prelim[v].X = 1;
    }
    int x = prelim[v].X;
    int a = prelim[v].A;
    arrthing.push_back(abs(a));
    for(auto &e : adj[v]) {
        if(start_value != numeric_limits<ld>::max()) return;
        int u = e.first;
        int c = e.second;
        if(u == p) continue;
        if(prelim[u].X == 0) {
            prelim[u].X = -1*x;
            prelim[u].A = c - a;
            explore(u, v);
        } else {
            if(prelim[u].X + x == 0) {
                if(prelim[u].A + a != c) {
                    cout << "NO";
                    exit(0);
                }
            }
            start_value = ((ld)x)*((ld)(c-a-prelim[u].A))/(2.0);
            return;
        }
    }
}
void assign(int v) {
    for(auto &e : adj[v]) {
        int u = e.first;
        ld c = (ld)e.second;
        ld nans = c - ans[v];
        if(ans[u] != numeric_limits<ld>::max()) {
            if(abs(ans[u] - nans) < EPS) continue;
            cout << "NO";
            exit(0);
        } else {
            ans[u] = nans;
            assign(u);
        }
    }
}

int main() {
    cin >> n >> m;
    ans.resize(n);
    adj.resize(n);
    for(int i = 0; i < m; i++) {
        int a,b,c; cin >> a >> b >> c; a--; b--;
        adj[a].push_back({b,c});
        adj[b].push_back({a,c});
    }
    for(int i = 0; i < n; i++) {
        if(ans[i] != numeric_limits<ld>::max()) continue;
        start_value = numeric_limits<ld>::max();
        arrthing = {};
        explore(i, -1);
        if(start_value != numeric_limits<ld>::max()) {
            ans[i] = start_value;
            assign(i);
        } else {
            sort(arrthing.begin(), arrthing.end());
            ans[i] = (arrthing.size() != 0) ? arrthing[(arrthing.size())/2] : 0;
            assign(i);
        }
    }
    cout << "YES\n";
    for(int i = 0; i < n; i++) {
        cout << ans[i] << ' ';
    }
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB answer = YES
2 Correct 1 ms 2652 KB answer = YES
3 Correct 1 ms 2796 KB answer = YES
4 Correct 1 ms 2652 KB answer = NO
5 Correct 1 ms 2652 KB answer = YES
6 Correct 1 ms 2796 KB answer = YES
7 Correct 1 ms 2652 KB answer = YES
8 Incorrect 1 ms 2652 KB participant answer is larger than the answer of jury
9 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB answer = YES
2 Correct 1 ms 2652 KB answer = YES
3 Correct 1 ms 2796 KB answer = YES
4 Correct 1 ms 2652 KB answer = NO
5 Correct 1 ms 2652 KB answer = YES
6 Correct 1 ms 2796 KB answer = YES
7 Correct 1 ms 2652 KB answer = YES
8 Incorrect 1 ms 2652 KB participant answer is larger than the answer of jury
9 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB answer = YES
2 Correct 1 ms 2652 KB answer = YES
3 Correct 1 ms 2796 KB answer = YES
4 Correct 1 ms 2652 KB answer = NO
5 Correct 1 ms 2652 KB answer = YES
6 Correct 1 ms 2796 KB answer = YES
7 Correct 1 ms 2652 KB answer = YES
8 Incorrect 1 ms 2652 KB participant answer is larger than the answer of jury
9 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB answer = YES
2 Correct 1 ms 2652 KB answer = YES
3 Correct 1 ms 2796 KB answer = YES
4 Correct 1 ms 2652 KB answer = NO
5 Correct 1 ms 2652 KB answer = YES
6 Correct 1 ms 2796 KB answer = YES
7 Correct 1 ms 2652 KB answer = YES
8 Incorrect 1 ms 2652 KB participant answer is larger than the answer of jury
9 Halted 0 ms 0 KB -

Subtask #5
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB answer = YES
2 Correct 1 ms 2652 KB answer = YES
3 Correct 1 ms 2796 KB answer = YES
4 Correct 1 ms 2652 KB answer = NO
5 Correct 1 ms 2652 KB answer = YES
6 Correct 1 ms 2796 KB answer = YES
7 Correct 1 ms 2652 KB answer = YES
8 Incorrect 1 ms 2652 KB participant answer is larger than the answer of jury
9 Halted 0 ms 0 KB -