Submission #1253055

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253055		FernandoJC07	Obstacles for a Llama (IOI25_obstacles)	C++20	Compilation error	0 ms	0 KiB

obstacles

#include <bits/stdc++.h>
#define For(i, a, n) for(int i = a; i<n; ++i)
#define Forr(i, a, n) for(int i = a; i>=n; --i)
#define vi vector<int>
#define vii vector<vector<int>>
using namespace std;

const int INF = 1e9+7;
vi res1, res2;

void proced(vi T, vi H, vi paabajo){
    int n = T.size();
    int m = H.size();
    vi mt(n); mt[n-1] = T[n-1]; 
    Forr(i, n-2, 0) mt[i] = max(mt[i+1], T[i]);
    vi mint(n); mint[n-1] = T[n-1];
    Forr(i, n-2, 0) mint[i] = min(mint[i+1], T[i]);
    int minx = INF;
    Forr(i, m-1, 0){
        minx = min(minx, H[i]);
        if(paabajo[i] == -1) continue;
        if(paabajo[i] == n-1){
             minx = INF;
             res2.push_back(i);
             continue;
        }
        int l = 0, r = n-1;
        while(r>l){
            int mid = l + (r-l)/2;
            if(mint[mid]<=minx) r = mid;
            else l = mid+1;
        }
        if(paabajo[i]>=l){
            res2.push_back(i);
        }
    }
    //mos(res2);
}

void initialize(vi T, vi H){
    int n = T.size();
    int m = H.size();
    vi mt(n); mt[0] = T[0]; 
    For(i, 1, n) mt[i] = max(mt[i-1], T[i]);
    vi mint(n); mint[0] = T[0];
    For(i, 1, n) mint[i] = min(mint[i-1], T[i]);
    int minx = INF;
    vi paabajo(m);
    For(i, 0, m){
        minx = min(minx, H[i]);
        int upper = upper_bound(mt.begin(), mt.end(), H[i]) - mt.begin();
        paabajo[i] = upper-1;
        --upper;
        if(upper==-1) continue;
        if(upper == n-1){
             minx = INF;
             res1.push_back(i);
             continue;
        }
        int l = 0, r = n-1;
        while(r>l){
            int mid = l + (r-l)/2;
            if(mint[mid]<=minx) r = mid;
            else l = mid+1;
        }
        if(upper>=l) res1.push_back(i);
    }
    //mos(res1);
    proced(T, H, paabajo);
    reverse(res2.begin(), res2.end());
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccxzNBbG.o: in function `main':
grader.cpp:(.text.startup+0x402): undefined reference to `can_reach(int, int, int, int)'
collect2: error: ld returned 1 exit status