Submission #490485

#	Time	Username	Problem	Language	Result	Execution time	Memory
490485		MohamedAliSaidane	Handcrafted Gift (IOI20_gift)	C++14	100 / 100	638 ms	50208 KiB

gift

#include <bits/stdc++.h>
#include "gift.h"
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ld,ld> pld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
typedef vector<pld> vpd;

#define pb push_back
#define popb pop_back
#define all(v) (v).begin(),(v).end()
#define ff first
#define ss second

const ll MOD = 1e9 + 7;
const ll INF = 1e18;
int nx[4] = {1,-1,0,0}, ny[4] = {0,0,1,-1};

/////// SOLUTION \\\\\\\

int n, r;
vi a, b, x;
vi p, rnk;
/*void craft(string s)
{
    cout << s << '\n';
}*/
int construct(int n, int r, vi a, vi b, vi x)
{
    vpi same;
    vpi diff;
    map<int,int> s;
    map<int,int> d;
    string res = "";
    for(int i=  0; i <n; i ++)
    {
        s[i]= i;
        res += 'R';
    }
    for(int i= 0; i <r; i ++)
    {
        if(x[i] == 1)
        {
            same.pb({a[i],b[i]});
            s[a[i]] = max(s[a[i]],b[i]);
        }
        else
        {
            diff.pb({a[i],b[i]});
        }

    }
    char c= 'R';
    int nr = 0;
    for(int i = 0; i < n; i ++)
    {
        nr = s[i];
        for(int u = i; u <= nr; u ++)
        {
            nr = max(nr,s[u]);
            res[u] = c;
        }
        c = c == 'R'? 'B': 'R';
        //cout <<i << ' '<< r;
        i = nr ;
    }
    int pref[n+1];
    pref[0] = 1;
    for(int i = 1; i <n; i ++)
    {
        pref[i] = pref[i-1] + (res[i] != res[i-1]);
    }
    for(auto e: diff)
    {
        if(pref[e.ss] - pref[e.ff] < 1)
            return 0;
    }
    craft(res);
    return 1;
}/*
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    int N, R;
    cin >> N >>  R;
    vi A, B, X;
    for(int i = 0; i <R;i  ++)
    {
        int ai, bi, xi;
        cin >> ai >> bi >> xi;
        A.pb(ai); B.pb(bi); X.pb(xi);
    }
    cout << construct(N,R,A,B,X);
}*/

Compilation message (stderr)

gift.cpp:27:1: warning: multi-line comment [-Wcomment]
   27 | /////// SOLUTION \\\\\\\
      | ^

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 20 / 20
• Subtask 4: 25 / 25
• Subtask 5: 30 / 30