This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
*/
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define int long long
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define NFS ios_base::sync_with_stdio(0) , cin.tie(0) , cout.tie(0) ;
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
//#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
typedef long long ll;
const int E = 1e6+777;
const long long inf = 1e18+777;
const int N = 1e5+777;
const int MOD = 1e9+7;
int n, m;
pair<int,int> a[E];
set<pair<int,int>> st;
vector<vector<int>> res;
main(){auto solve=[&](){
cin >> n >> m;
for(int i = 1; i <= n; ++i){
cin >> a[i].F, a[i].S = i;
if(a[i].F > 0){
st.insert(a[i]);
}
}
while(sz(st) > 1){
auto[val1, pos1] = *st.begin();
auto[val2, pos2] = *++st.begin();
st.erase(st.begin());
st.erase({val2,pos2});
val1--,val2--;
if(val1 > 0) st.insert({val1,pos1});
if(val2 > 0) st.insert({val2,pos2});
vector<int>e = {pos2,pos1};
res.pb(e);
}
if(sz(st) == 1){
cout << -1;
}else{
for(auto v : res){
cout << 1 << ' ';
for(auto it : v)
cout << it << ' ';
cout << '\n';
}
}
};NFS;solve();}
Compilation message (stderr)
nicegift.cpp:30:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
30 | main(){auto solve=[&](){
| ^~~~
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