Submission #495287

#	Time	Username	Problem	Language	Result	Execution time	Memory
495287		kingline	Gift (IZhO18_nicegift)	C++17	0 / 100	55 ms	1904 KiB

nicegift

#include <bits/stdc++.h>
#define pb push_back
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(data) data.begin() , data.end()
#define endl '\n'
//freopen("nenokku_easy.in", "r", stdin);
//freopen("nenokku_easy.out", "w", stdout);
#define int long long
#define pii pair < int, int >

using namespace std;

typedef long long ll;
const int N = 1e5 + 5;

int n, k, rel, a[N], b[N];
vector < pair < int, pii > > path;

void rec() {
    bool ok = 1;
    for(int i = 1; i <= n; i++) {
        if(b[i] > a[i]) return;
        if(b[i] < a[i]) ok = 0;
    }
    if(ok) {
        cout << path.size() << endl;
        for(int i = 0; i < path.size(); i++) {
            cout << path[i].first << " " << path[i].second.first << " " << path[i].second.second << endl;
        }
        exit(0);
    }
    for(int i = 1; i <= n; i++) {
        for(int j = i + 1; j <= n; j++) {
            for(int w = rel; w > 0; w--) {
                path.pb({w, {i, j}});
                b[i] += w;
                b[j] += w;
                rec();
                b[i] -= w;
                b[j] -= w;
                path.pop_back();
            }
        }
    }
}

main() {
    /*ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);*/
    cin >> n >> k;
    for(int i = 1; i <= n; i++) {
        cin >> a[i];
        rel = max(rel, a[i]);
    }
    rec();
}

/*
5
2 8 5 1 10
5
2 3 5 3
2 5 3 3
1 4 4
2 3 4 2
1 1 2
*/

Compilation message (stderr)

nicegift.cpp: In function 'void rec()':
nicegift.cpp:27:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         for(int i = 0; i < path.size(); i++) {
      |                        ~~^~~~~~~~~~~~~
nicegift.cpp: At global scope:
nicegift.cpp:47:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   47 | main() {
      | ^~~~

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