Submission #1197396

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197396		adiyer	Swapping Cities (APIO20_swap)	C++20	0 / 100	2096 ms	14596 KiB

swap

#pragma optimize ("g",on)
#pragma GCC optimize("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
 #include <bits/stdc++.h>

using namespace std;

const int MAXN = 2e5 + 11;

int n, m, dx, dy;
int p[MAXN];

bool was[MAXN];

vector < int > g[MAXN];

vector < pair < int, pair < int, int > > > reb;

void init(int N, int M, vector < int > U, vector < int > V, vector < int > W){
    n = N, m = M;
    for(int i = 0; i < m; i++) reb.push_back({W[i], {U[i], V[i]}});
    sort(reb.begin(), reb.end());
}

void dfs(int v){
    was[v] = 1;
    for(int u : g[v])
        if(!was[u] && (dx == u) + (dy == u) + (dx == v) + (dy == v) < 2)
            p[u] = v, dfs(u);
}

bool f(int x, int y, int till){
    for(int i = 0; i < n; i++) g[i].clear(), was[i] = 0;
    for(int i = 0; i <= till; i++){
        g[reb[i].second.first].push_back(reb[i].second.second);
        g[reb[i].second.second].push_back(reb[i].second.first);
    }
    dx = dy = -1, dfs(x);
    if(!was[y]) return 0;
    dx = y, dy = p[y];
    int v = p[y];
    while(v != x){
        if(g[v].size() > 2) return 1;
        v = p[v];
    }
    for(int i = 0; i < n; i++) was[i] = 0;
    dfs(x);
    return was[y];
}

int getMinimumFuelCapacity(int X, int Y) {
    int l = 0, r = m;
    while(r - l > 1){
        int md = (l + r) / 2;
        if(f(X, Y, md)) r = md;
        else l = md;
    }
    if(r == m) return -1;
    return reb[r].first;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27