Submission #275881

#	Time	Username	Problem	Language	Result	Execution time	Memory
275881		AKaan37	Dynamic Diameter (CEOI19_diameter)	C++17	31 / 100	2121 ms	25192 KiB

diameter

//Bismillahirrahmanirrahim
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#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;

#define fi first
#define se second
#define mp make_pair
#define int long long
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 500005;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,flag,t,x[li],y[li],z[li],mx,ind;
int cev;
multiset<int> st;
string s;
vector<PII> v[li];

inline void dfs(int node,int ata,int der){
	for(int i=0;i<(int)v[node].size();i++){
		int go=v[node][i].fi;
		int co=v[node][i].se;
		if(go==ata)continue;
		dfs(go,node,der+co);
	}
	if(der>mx)ind=node;
	mx=max(mx,der);
}

int32_t main(void){
	scanf("%lld %lld %lld",&n,&t,&k);
	for(int i=1;i<n;i++){
		scanf("%lld %lld %lld",&x[i],&y[i],&z[i]);
		st.insert(z[i]);
	}
	if(n*t<=5000*5000){
		while(t--){
			int d,e;
			scanf("%lld %lld",&d,&e);
			z[(d+cev)%(n-1)+1]=(cev+e)%k;
			FOR v[i].clear();
			for(int i=1;i<n;i++){
				v[x[i]].pb({y[i],z[i]});
				v[y[i]].pb({x[i],z[i]});
			}
			mx=0;
			dfs(1,0,0);
			mx=0;
			dfs(ind,0,0);
			cev=mx;
			printf("%lld\n",cev);
		}
		return 0;
	}
	while(t--){
		int d,e;
		scanf("%lld %lld",&d,&e);
		st.erase(st.find(z[(d+cev)%(n-1)+1]));
		z[(d+cev)%(n-1)+1]=(cev+e)%k;
		st.insert(z[(d+cev)%(n-1)+1]);
		auto it=st.end();
		if(it==st.begin()){cev=0;printf("%lld\n",cev);continue;}
		it--;
		cev=*it;
		if(it==st.begin()){printf("%lld\n",cev);continue;}
		it--;
		cev+=*it;
		printf("%lld\n",cev);
	}
	return 0;
}

Compilation message (stderr)

diameter.cpp: In function 'int32_t main()':
diameter.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   48 |  scanf("%lld %lld %lld",&n,&t,&k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
diameter.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   50 |   scanf("%lld %lld %lld",&x[i],&y[i],&z[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diameter.cpp:56:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |    scanf("%lld %lld",&d,&e);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~
diameter.cpp:74:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   74 |   scanf("%lld %lld",&d,&e);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 7 / 7
• Subtask 4: 0 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 27