Submission #217116

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
217116	2020-03-29 02:57:31	anonymous	Capital City (JOI20_capital_city)	C++14	100 / 100	766 ms	32372 KiB

capital_city

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#include<iostream>
#include<set>
#include<vector>
#include<cassert>
#define MAXN 200005
using namespace std;
int N, K, best = 1<<30, C[MAXN];
vector <int> adj[MAXN], type[MAXN]; //adj and towns in each city
int cmp[MAXN], id = 1;
//Solve for a node
int par[MAXN];
bool done[MAXN];
vector <int> S;
set <int> Used;
void reroot(int u, int prev) {
    if (cmp[u] != cmp[prev]) {return;}
    par[u] = prev, done[u]=false;
    for (auto v: adj[u]) {if (v != prev) {reroot(v, u);}}
}
int slv(int v) { //centre v
    int ans = 0;
    S.clear();
    Used.clear();
    reroot(v, v);
    Used.insert(C[v]);
    par[v] = 0;
    for (auto k: type[C[v]]) {
        if (cmp[k] != cmp[v]) {
            return(1<<30);
 
 
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Compilation message (stderr)

capital_city.cpp: In function 'int slv(int)':
capital_city.cpp:22:9: warning: unused variable 'ans' [-Wunused-variable]
     int ans = 0;
         ^~~
capital_city.cpp: In function 'int main()':
capital_city.cpp:115:10: 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:118:14: 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:123:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&C[i]);
         ~~~~~^~~~~~~~~~~~

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