Submission #1101103

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101103		Beerus13	Handcrafted Gift (IOI20_gift)	C++17	Compilation error	0 ms	0 KiB

gift

#include<bits/stdc++.h>
using namespace std;
#define FOR(i, a, b)  for(int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, b, a) for(int i = (b), _a = (a); i >= _a; --i)
#define REP(i, a, b)  for(int i = (a), _b = (b); i < _b;  ++i)
#define REPD(i, b, a) for(int i = (b), _a = (a); i > _a;  --i)
#define MASK(i) (1LL << (i))
#define BIT(mask, i) (((mask) >> (i)) & 1)
#define __builtin_popcount __builtin_popcountll
#define all(val) val.begin(), val.end()
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(v) (int)v.size()
#define fi first
#define se second

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll Rand(ll l, ll r) {return l + rng() % (r - l + 1);}

template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        if (x > y) {
            x = y;
            return true;
        } else return false;
    }
template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        if (x < y) {
            x = y;
            return true;
        } else return false;
    }
template<class T>
    T Abs(const T &x) {
        return (x < 0 ? -x : x);    
    }

const int mod = 1e9 + 7;
const int inf = 1e9;
const int N = 5e5 + 5;

#include "gift.h"
int construct(int n, int r, vector<int> &a, vector<int> &b, vector<int> &x) {
    vector<pii> one, two;
    REP(i, 0, r) {
        if(x[i] == 1) one.emplace_back(a[i], b[i]);
        else two.emplace_back(a[i], b[i]);            
    }
    sort(all(one));

    vector<int> res(n, 0);
    int posL = -1, posR = -1, val = 1;
    if(one.size()) posL = one[0].fi, posR = one[0].se;

    for(auto &[l, r] : one) {
        if(posR >= l) posR = max(posR, r);
        else {
            FOR(i, posL, posR) res[i] = val;
            if((l - posR) & 1) val = 3 - val;
            posL = l;
            posR = r;
        }
    }
    FOR(i, posL, posR) res[i] = val;
    val = 1;
    REP(i, 0, n) {
        if(res[i]) val = 3 - res[i];
        else res[i] = val;

    }
    FORD(i, n - 1, 0) {
        if(res[i]) val = 3 - res[i];
        else res[i] = val;
    }
    vector<int> sumR(n + 1, 0), sumB(n + 1, 0);
    REP(i, 0, n) {
        sumR[i + 1] = sumR[i] + (res[i] == 1);
        sumB[i + 1] = sumB[i] + (res[i] == 2);
    }
    for(auto &[l, r] : two) {
        int red = sumR[r + 1] - sumR[l];
        int blue = sumB[r + 1] - sumB[l];
        if(red + blue != 2) 
            return 0;
    }
    string s = "";
    REP(i, 0, n) {
        if(res[i] == 1) s += 'R';
        else s += 'B';
    }
    craft(s);
    return 1;
}

// void process() {
//     int n, r;
//     cin >> n >> r;
//     vector<int> a(r), b(r), x(r);
//     for(int &val : a) cin >> val;
//     for(int &val : b) cin >> val;
//     for(int &val : x) cin >> val;
//     construct(n, r, a, b, x);
// }

// signed main() {
//     if(fopen("test.inp","r")) {
//         freopen("test.inp","r",stdin);
//         freopen("test.out","w",stdout);
//     }
//     ios::sync_with_stdio(0);
//     cin.tie(0); cout.tie(0);

//     // clock_t start = clock();

//     int ntests = 1;
//     // cin >> ntests;
//     while(ntests--) process();

//     // cerr << "Time elapsed: " << clock() - start << " ms!\n";
//     return 0;
// }
// https://oj.uz/problem/view/IOI20_gift

Compilation message (stderr)

/usr/bin/ld: /tmp/cchFRR7s.o: in function `main':
grader.cpp:(.text.startup+0x272): undefined reference to `construct(int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status