Submission #495240

#	Time	Username	Problem	Language	Result	Execution time	Memory
495240		armashka	Gift (IZhO18_nicegift)	C++17	7 / 100	2091 ms	8752 KiB

nicegift

#include <bits/stdc++.h>
 
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#define fast ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
#define all(v) v.begin(),v.end()
#define pb push_back
#define sz size()
#define ft first
#define sd second
 
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef unsigned long long ull;
 
const int N = 1e6 + 5;
const ll M = 1e8;
const ll inf = 1e9;
const ll mod = 1e9;
const double Pi = acos(-1); 
 
ll binpow(ll x, ll ti) { ll res = 1;while (ti){if(ti & 1)res *= x;x *= x;ti >>= 1; x %= mod; res %= mod;} return res;}
ll binmul(ll x, ll ti) { ll res = 0;while (ti){if(ti & 1)res += x;x += x;ti >>= 1; x %= mod; res %= mod;} return res;}
ll nok(ll a, ll b) { return (a*b)/__gcd(abs(a),abs(b)) * (a*b > 0 ? 1 : -1); }
bool odd(ll n) { return (n % 2 == 1); }
bool even(ll n) { return (n % 2 == 0); }            
                                                                    
ll n, k, a[N];
vector <pair<ll, ll>> ans;
 
void rec() {
	if (ans.sz > 3e6) return;
	bool ok = 1;
	for (int i = 1; i <= n; ++ i) ok &= !a[i];
	if (ok) {
		cout << ans.sz << "\n";
		for (auto [x, y] : ans) cout << "1 " << x << " " << y << "\n";
		exit(0);
	}
	for (int i = 1; i <= n; ++ i) {
		for (int j = 1; j <= n; ++ j) {
			if (i == j || !a[i] || !a[j]) continue;
			ans.pb({i, j});
			-- a[i]; -- a[j];
			rec();
			++ a[i]; ++ a[j];
			ans.pop_back();
		}
	}
}

const void solve(/*Armashka*/) {
	cin >> n >> k;
	for (int i = 1; i <= n; ++ i) cin >> a[i];
	rec();	
	cout << "-1\n";
}
 
signed main() {
    fast;
	//freopen("divide.in", "r", stdin);
	//freopen("divide.out", "w", stdout);
    int tt = 1;
    //cin >> tt;
    while (tt --) {
    	solve();
	}
}
 
/*
9 12
1 9 4
1 2 5
2 3 7
2 4 3
4 3 6
3 6 4
8 7 10
6 7 5
5 8 1
9 5 7
5 4 12
6 8 2
2
4 7
5
1 6
5 3
4 8
5 8
1 5
 
*/

Compilation message (stderr)

nicegift.cpp:3: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    3 | #pragma comment(linker, "/stack:200000000")
      |

• Subtask 1: 7 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 51