#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<pair<int,int>> res;
signed 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]);
}
}
// cerr << "ST\n";
// for(auto it : st){
// cerr << it.F << ' ' << it.S << '\n';
// }
// cerr << '\n';
while(sz(st) > 1){
auto[val1, pos1] = *(--st.end());
auto[val2, pos2] = *--(--st.end());
st.erase({val1,pos1});
st.erase({val2,pos2});
// cerr << "v1: " << val1 << " p1: " << pos1 << " v2: " << val2 << " p2: " << pos2 << '\n';
val1--,val2--;
if(val1 > 0) st.insert({val1,pos1});
if(val2 > 0) st.insert({val2,pos2});
res.pb({pos1,pos2});
}
if(sz(st) >= 1){
cout << -1;
}else{
cerr << sz(res) << '\n';
for(auto v : res){
cout << 1 << ' ';
cout << it.F << ' ' << it.S;
cout << '\n';
}
}
};NFS;solve();}
Compilation message
nicegift.cpp: In lambda function:
nicegift.cpp:60:13: error: 'it' was not declared in this scope; did you mean 'st'?
60 | cout << it.F << ' ' << it.S;
| ^~
| st
