Submission #558134

#	Time	Username	Problem	Language	Result	Execution time	Memory
558134		Olympia	Game (IOI14_game)	C++17	Compilation error	0 ms	0 KiB

game

#include <bits/stdc++.h>
//#include <game.h>
using namespace std;
struct dsu {
    vector<int> parent;
    vector<int> compSize;
    int n;
    int cc;
    void fill(){
        cc = n;
        parent.resize(n), compSize.resize(n);
        for(int i = 0; i < n; i++){
            parent[i] = i, compSize[i] = 1;
        }
    }
    int find_head(int x){
        if(x == parent[x]){
            return x;
        }
        return find_head(parent[x]);
    }
    void join(int x, int y){
        x = find_head(x);
        y = find_head(y);
        if(x == y){
            return;
        }
        cc--;
        if(compSize[x] > compSize[y]){
            swap(x,y);
        }
        parent[x] = y;
        compSize[y] += compSize[x]; 
    }
    bool comp(int x, int y){
        return (find_head(x) == find_head(y));
    }
};
set<pair<int,int> > edges;
set<pair<int,int> > e;
dsu d;
void initialize (int n)  {
    d.n = n;
    d.fill();
    while (d.cc != 1) {
        int u = rand() % n;
        int v = rand() % n;
        if (!d.comp(u, v)) {
            edges.insert(make_pair(u, v));
            d.join(u, v);
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (i != j) {
                e.insert(make_pair(i, j));
            }
        }
    }
}
int hasEdge (int u, int v) {
    if (!edges.count(make_pair(u, v)) && !edges.count(make_pair(v, u))) {
        e.erase(make_pair(u, v));
        e.erase(make_pair(v, u));
        return false;
    }
    d.fill();
    for (auto& p: edges) {
        if (p != make_pair(u, v) && p != make_pair(v, u)) {
            d.join(p.first, p.second);
        }
    }
    for (auto& p: e) {
        if (!d.comp(p.first, p.second)) {
            edges.erase(make_pair(u, v));
            e.erase(make_pair(u, v));
            e.erase(make_pair(v, u));
            edges.insert(p);
            return false;
        }
    }
    return true;
}
int main() {
    initialize(4);
    cout << hasEdge(0, 1) << '\n';
    cout << hasEdge(1, 3) << '\n';
    cout << hasEdge(1, 2) << '\n';
    cout << hasEdge(2, 0) << '\n';
    cout << hasEdge(2, 3) << '\n';
    cout << hasEdge(0, 3) << '\n';
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccI2g8Td.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccDpxOBb.o:game.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status