Submission #162906

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
162906	2019-11-10T08:50:42 Z	_qVp_	Mag (COCI16_mag)	C++14	120 / 120	577 ms	168672 KB

#include <bits/stdc++.h>
    
using namespace std;
    
const int md = 1e6 + 10;
typedef pair < long long, int > II;    

vector < int > adj[md];
int a[md], u[md], v[md], par[md];
int f[md][5];
queue < int > q;
int n;
long long a1 = 1e9, b1 = 1;
    
void compare(long long a2, long long b2) {
    if (a1 * b2 >= a2 * b1) {
        a1 = a2;
        b1 = b2;
    }
}

void dfs(int u, int root) {
    for(int i = 0; i < adj[u].size(); i++) {
        int v = adj[u][i];
        if (par[u] == v) continue;
        par[v] = u;
        dfs(v, root);
        if (a[u] == 1) {
            compare(1, f[u][0] + f[v][0]);
            compare(2, f[u][0] + f[v][1]);
            compare(2, f[u][1] + f[v][0]);
            f[u][0] = max(f[u][0], f[v][0] + 1);
            f[u][1] = max(f[u][1], f[v][1] + 1);
        } else {
            compare(2, f[u][1] + f[v][0]);
            f[u][1] = max(f[u][1], f[v][0] + 1);
        }
    }

}

int main() {
    //freopen("test.in", "r", stdin);
    //freopen("test.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin >> n;
    for(int i = 1; i < n; i++) 
        cin >> u[i] >> v[i];
    for(int i = 1; i <= n; i++)
        cin >> a[i];
    for(int i = 1; i < n; i++) {
        //int u, v;
        //cin >> u >> v;
        if (a[u[i]] + a[v[i]] <= 3) {
            adj[u[i]].push_back(v[i]);
            adj[v[i]].push_back(u[i]);

        }
    }
    for(int i = 1; i <= n; i++) {
        f[i][0] = (a[i] == 1);
        f[i][1] = (a[i] == 2);
    }
    for(int i = 1; i <= n; i++) 
        if (!par[i]) {
            if (a[i] >= 3) {
                compare(a[i], 1);
                continue;
            }
            //cout << i << endl;
            par[i] = i;
            dfs(i, i);
        }
    //for(int i = 1; i <= n; i++)
    //    cout << i <<" " << f[i][0] << " " << f[i][1] << endl;
    int gcd = __gcd(a1, b1);
    cout << a1 / gcd << "/" << b1 / gcd;
    return 0;
}

Compilation message

mag.cpp: In function 'void dfs(int, int)':
mag.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < adj[u].size(); i++) {
                    ~~^~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	26 ms	23900 KB	Output is correct
2	Correct	24 ms	23928 KB	Output is correct

Subtask #2
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	24 ms	23904 KB	Output is correct
2	Correct	26 ms	23928 KB	Output is correct

Subtask #3
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	449 ms	108516 KB	Output is correct

Subtask #4
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	24 ms	23800 KB	Output is correct
2	Correct	480 ms	87548 KB	Output is correct

Subtask #5
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	577 ms	165216 KB	Output is correct

Subtask #6
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	494 ms	90072 KB	Output is correct
2	Correct	378 ms	72568 KB	Output is correct

Subtask #7
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	488 ms	91024 KB	Output is correct
2	Correct	92 ms	30712 KB	Output is correct
3	Correct	571 ms	168672 KB	Output is correct

Subtask #8
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	86 ms	30584 KB	Output is correct
2	Correct	497 ms	90440 KB	Output is correct
3	Correct	385 ms	57848 KB	Output is correct

Subtask #9
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	456 ms	85476 KB	Output is correct
2	Correct	491 ms	89132 KB	Output is correct

Subtask #10
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	503 ms	90784 KB	Output is correct
2	Correct	393 ms	57720 KB	Output is correct