Submission #217224

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
217224	2020-03-29 09:06:02	DodgeBallMan	Capital City (JOI20_capital_city)	C++14	100 / 100	995 ms	38264 KiB

capital_city

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#include <bits/stdc++.h>
#define pii pair<int, int>
#define x first
#define y second 
using namespace std;
const int N = 2e5+5;
int n, k, ans = 1e9;
int C[N], cnt[N];
vector<int> g[N];
int sz[N];
bitset<N> chk;
int get_sz(int u, int p) {
    sz[u] = 1;
    for(int v : g[u]) if(v != p && !chk[v])
        sz[u] += get_sz(v, u);
    return sz[u];
}
int find_cen(int u, int p, int all, pii &ret ) {
    int mx = all - sz[u];
    for(int v : g[u]) if(v != p && !chk[v])
        mx = max(mx, find_cen(v, u, all, ret));
    ret = min( ret, pii( mx, u ) );
    return sz[u];
}
 
 
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Compilation message (stderr)

capital_city.cpp: In function 'void process(int)':
capital_city.cpp:54:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(col[now].size() != cnt[now]) { valid = false; break; }
            ~~~~~~~~~~~~~~~~^~~~~~~~~~~
capital_city.cpp: In function 'int main()':
capital_city.cpp:67:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
capital_city.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~
capital_city.cpp:72:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1; i <= n; i++) scanf("%d", C + i), ++cnt[C[i]];
                                 ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30
• Subtask 4: 59 / 59