Submission #114694

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
114694	2019-06-02 10:58:18	PeppaPig	One-Way Streets (CEOI17_oneway)	C++14	100 / 100	155 ms	16584 KiB

oneway

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#include <bits/stdc++.h>
using namespace std;
const int N = 1e5+5;
int dsu[N];
int find(int x) { return dsu[x] = x == dsu[x] ? x : find(dsu[x]); }
int n, m, p;
int a[N], b[N];
vector<int> g[N];
int pre[N], low[N];
bitset<N> br;
void tarjan(int u, int p) {
    static int idx = 0;
    pre[u] = low[u] = ++idx;
    for(int i : g[u]) if(i != p) {
        int v = a[i] ^ b[i] ^ u;
        if(!pre[v]) {
            tarjan(v, i);
            low[u] = min(low[u], low[v]);
            if(low[v] > pre[u]) br[i] = true;
        } else low[u] = min(low[u], pre[v]);
    }
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

oneway.cpp: In function 'int main()':
oneway.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
oneway.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", a+i, b+i);
         ~~~~~^~~~~~~~~~~~~~~~~~~
oneway.cpp:60:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &p);
     ~~~~~^~~~~~~~~~
oneway.cpp:62:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40