Submission #1201650

#	Time	Username	Problem	Language	Result	Execution time	Memory
1201650		adiyer	Game (APIO22_game)	C++20	Compilation error	0 ms	0 KiB

game

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 5e5 + 11;

int n, k;
int was[MAXN], good[MAXN], t[4 * MAXN];

vector < int > g[MAXN], a[MAXN];

void upd(int k, int x, int v = 1, int l = 0, int r = n - 1){
    if(l == r){ t[v] += x; return; }
    int md = (l + r) / 2;
    if(k <= md) upd(k, x, v + v, l, md);
    else upd(k, x, v + v + 1, md + 1, r);
    t[v] = max(t[v + v], t[v + v + 1]);
}

int get(int tl, int tr, int v = 1, int l = 0, int r = n - 1){
    if(r < tl || tr < l) return 0;
    if(tl <= l && r <= tr) return t[v];
    int md = (l + r) / 2;
    return max(get(tl, tr, v + v, l, md), get(tl, tr, v + v + 1, md + 1, r));
}

void dfs(int v){
    if(!was[v]) upd(v, 1), was[v] = 1;
    for(int u : g[v])
        if(!was[u])
            dfs(u);
}

void rfs(int v){
    if(!good[v]) upd(v, 1), good[v] = 1;
    for(int u : a[v])
        if(!good[u])
            rfs(u);
}

void init(int _n, int _k) {
    n = _n, k = _k;
    for(int i = 0; i < k - 1; i++) g[i].push_back(i + 1);
    for(int i = 0; i < k; i++) was[i] = 1, upd(i, 1);
}

int add_teleporter(int u, int v){
    if(u >= v && u < k) return 1;
    if(u >= k && v < k && !good[u]) good[u] = 1, upd(u, 1);
    g[u].push_back(v), a[v].push_back(u);
    if(was[u]) dfs(u);
    if(good[u]) rfs(u);
    return get(k, n - 1) > 1;
}

namespace {

int read_int() {
  int x;
  if (scanf("%d", &x) != 1) {
    fprintf(stderr, "Error while reading input\n");
    exit(1);
  }
  return x;
}

}  // namespace

int main() {
  int N = read_int();
  int M = read_int();
  int K = read_int();
  std::vector<int> u(M), v(M);
  for (int i = 0; i < M; ++i) {
    u[i] = read_int();
    v[i] = read_int();
  }

  init(N, K);
  int i;
  for (i = 0; i < M; ++i) {
    int answer = add_teleporter(u[i], v[i]);
    if (answer != 0 && answer != 1) {
      i = -1;
      break;
    } else if (answer == 1) {
      break;
    }
  }
  printf("%d\n", i);
  return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccXNUM39.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cchZMWb1.o:game.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status