Submission #1201599

#	Time	Username	Problem	Language	Result	Execution time	Memory
1201599		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, ver;
int was[MAXN], r[MAXN], l[MAXN];

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

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

void dfs2(int v, int st){
    was[v] = 1, l[v] = min(l[v], st);
    for(int u : rg[v])
        if(!was[u])
            dfs2(u, st);
}

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

int add_teleporter(int u, int v){
    g[u].push_back(v);
    for(int i = 0; i < n; i++) r[i] = -1, l[i] = n;
    for(int i = 0; i < n; i++) was[i] = 0;
    for(int i = k - 1; i >= 0; i--) dfs(i, i);
    for(int i = 0; i < n; i++) was[i] = 0;
    for(int i = 0; i < k; i++) dfs2(i, i);
    for(int i = 0; i < n; i++)
        if(l[i] <= r[i]) 
            return 1;
    return 0;
}

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/cce0kBjR.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccgEQbJK.o:game.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status