Submission #302654

#	Time	Username	Problem	Language	Result	Execution time	Memory
302654		dCoding	Game (IOI14_game)	C++17	0 / 100	1 ms	384 KiB

game

#include <bits/stdc++.h>
#include "game.h"
using namespace std;
#define F first
#define S second

const int MAXN = 1505;
int coredge[MAXN], deg[MAXN];
set<pair<int, int>> s;
int n, comps;
int root[MAXN], ranks[MAXN];

int findRoot(int node) {
	if(root[node] == node) return node;
	return root[node] = findRoot(root[node]);
}
bool sameComp(int u, int v) {
	return findRoot(u) == findRoot(v);
}
bool unite(int u, int v) {
	if(sameComp(u,v)) return false;
	int r1 = root[u], r2 = root[v];
	if(ranks[r1] > ranks[r2]) {
		root[r2] = r1;
		ranks[r1] += ranks[r2];
	} else {
		root[r1] = r2;
		ranks[r2] += ranks[r1];
	}
	return true;
}


void initialize(int _n) {
	n = _n;
	comps = n;
	for(int i=0;i<n;i++) s.insert({deg[i], i});
	for(int i=0;i<n;i++) {
		root[i] = i; ranks[i] = 1;
	}
}

int hasEdge(int u, int v) {
	++coredge[u]; ++coredge[v];
	int topnode = s.begin()->S;
	if(comps > 2) {
		s.erase({deg[u],u});
		s.erase({deg[v],v});
		++deg[u]; ++deg[v];
		s.insert({deg[u],u});
		s.insert({deg[v],v});
		unite(u,v); --comps;
		return 1;
	} else {
		if(!(comps == 2 && !sameComp(u,v))) {
			s.erase({deg[u],u});
			s.erase({deg[v],v});
			++deg[u]; ++deg[v];
			s.insert({deg[u],u});
			s.insert({deg[v],v});
			unite(u,v); --comps; 
			return 1; 
		} else {
			return 0;
		}
	}
}

Compilation message (stderr)

game.cpp: In function 'int hasEdge(int, int)':
game.cpp:45:6: warning: unused variable 'topnode' [-Wunused-variable]
   45 |  int topnode = s.begin()->S;
      |      ^~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 27
• Subtask 3: 0 / 58