Submission #1065243

#	Time	Username	Problem	Language	Result	Execution time	Memory
1065243		mindiyak	Dynamic Diameter (CEOI19_diameter)	C++17	24 / 100	5056 ms	5212 KiB

diameter

#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (ll i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1e6+3;
void init(string name)
{
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}

int n,q,w;
vector<vector<pair<int,ll>>> paths(1e5+5);
vpi edges;
vl visited;
int mx = 0;

void dfs(int pos,ll dis,int prev){
    if(visited[pos])return;
    visited[pos] = dis;
    if(visited[pos] > visited[mx])mx = pos;

    for(auto ed:paths[pos]){
        if(visited[ed.F])continue;
        if(ed.F == prev)continue;
        dfs(ed.F,dis+ed.S,prev);
    }
}

void solve()
{
    cin >> n >> q >> w;
    FOR(i,0,n-1){
        int a,b;ll c;
        cin >> a >> b >> c;
        paths[a].pb({b,c});
        paths[b].pb({a,c});
        edges.pb({a,b});
    }

    ll last = 0;

    // cerr << endl;

    FOR(i,0,q){
        int a;ll b;cin >> a >> b;   

        a = (a+last)%(n-1);
        b = (b+last)%w;

        // cerr << edges[a].F  << " " << edges[a].S  << " " << b << endl;

        FOR(k,0,paths[edges[a].F].size()){
            if(paths[edges[a].F][k].F  == edges[a].S){
                paths[edges[a].F][k].S = b;
            }
        }
        FOR(k,0,paths[edges[a].S].size()){
            if(paths[edges[a].S][k].F  == edges[a].F){
                paths[edges[a].S][k].S = b;
            }
        }

        visited = vl(n+1,0);
        mx = 0;
        dfs(1,0,1);

        visited = vl(n+1,0);

        // cerr << mx << " | ";

        dfs(mx,0,mx);

        // FOR(i,1,n+1)cerr << visited[i] << " ";
        // cerr << endl;

        cout << visited[mx] << endl;
        // cout << "ans " << visited[mx] << endl;

        last = visited[mx];
    }
}   
 
 
int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

diameter.cpp: In function 'void solve()':
diameter.cpp:24:39: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 | #define FOR(i, a, b) for (ll i = a; i < (b); i++)
      |                                       ^
diameter.cpp:94:9: note: in expansion of macro 'FOR'
   94 |         FOR(k,0,paths[edges[a].F].size()){
      |         ^~~
diameter.cpp:24:39: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 | #define FOR(i, a, b) for (ll i = a; i < (b); i++)
      |                                       ^
diameter.cpp:99:9: note: in expansion of macro 'FOR'
   99 |         FOR(k,0,paths[edges[a].S].size()){
      |         ^~~
diameter.cpp: In function 'void init(std::string)':
diameter.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diameter.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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