Codeforces Round #652 (Div. 2) E - DeadLee (贪心)

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
#define inf 0x7fffffff
#define ll long long
#define mod (1000000007)
#define maxn 200005
int num[maxn],have[maxn];
pair<int,int> node[maxn];
vector<int> v[maxn], ans;
queue<int> q;
bool vis[maxn];
int main(){
    int i, n, j, k, t, m, x, y;
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;i++) scanf("%d",&have[i]);
	for(i=1;i<=m;i++){
        scanf("%d%d",&x,&y);
        num[x]++;num[y]++;
        node[i]={x,y};
        v[x].push_back(i);
        v[y].push_back(i);
	} 
	for(i=1;i<=n;i++) if(num[i]<=have[i]) q.push(i);
	while(!q.empty()){
        int cur=q.front();q.pop();
        int lim=v[cur].size();
        for(i=0;i<lim;i++){
            k = v[cur][i];
            if(vis[k]) continue;
            vis[k]=1;
            ans.push_back(k);
            int to=node[k].first;
            if(to==cur) to=node[k].second;
            if(--num[to]==have[to]) q.push(to);
        }
	}
	if(ans.size()!=m) printf("DEAD\n");
	else{
        printf("ALIVE\n");
        for(i=m-1;i>=0;i--) printf("%d ",ans[i]);
        printf("\n");
	} 
}