Submission #1197413

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197413		adiyer	Swapping Cities (APIO20_swap)	C++20	Compilation error	0 ms	0 KiB

swap

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 2e5 + 11;

int n, m, mn, mx, ok;

bool was[MAXN];

vector < int > cmp;
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, cmp.push_back(v);
    for(int u : g[v])
        if(!was[u])
            dfs(u);
}

bool f(int x, int y, int till){
    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);
    cmp.clear(), dfs(x), mn = n, mx = 0, ok = was[y];
    for(int v : cmp) mn = min(mn, (int) g[v].size()), mx = max(mx, (int) g[v].size()), was[v] = 0;
    for(int i = 0; i <= till; i++) g[reb[i].second.first].clear(), g[reb[i].second.second].clear();
    return ((mx > 2 || mn >= 2) && (ok));
}

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;
}

int main() {
  int N, M;
  assert(2 == scanf("%d %d", &N, &M));
  
  std::vector<int> U(M), V(M), W(M);
  for (int i = 0; i < M; ++i) {
    assert(3 == scanf("%d %d %d", &U[i], &V[i], &W[i]));
  }

  int Q;
  assert(1 == scanf("%d", &Q));

  std::vector<int> X(Q), Y(Q);
  for (int i = 0; i < Q; ++i) {
    assert(2 == scanf("%d %d", &X[i], &Y[i]));
  }

  init(N, M, U, V, W);
  
  std::vector<int> minimum_fuel_capacities(Q);
  for (int i = 0; i < Q; ++i) {
    minimum_fuel_capacities[i] = getMinimumFuelCapacity(X[i], Y[i]);
  }

  for (int i = 0; i < Q; ++i) {
    printf("%d\n", minimum_fuel_capacities[i]);
  }
  
  return 0;
}

Compilation message (stderr)

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