Submission #97258

#	Time	Username	Problem	Language	Result	Execution time	Memory
97258		popovicirobert	Permutation Recovery (info1cup17_permutation)	C++14	25 / 100	38 ms	384 KiB

Main

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
#define ld long double
// 217
// 44

using namespace std;

const int MOD1 = 666013;
const int MOD2 = 666019;
const int MAXN = 70000;

ull dif[MAXN + 1], aux[MAXN + 1];
string str;

const int B = 300;

unordered_multiset <ull> fr[MAXN / B];
ull lazy[MAXN / B];

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, j, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin >> n;
    ull last = 0;
    for(i = 0; i < n; i++) {
        cin >> str;
        ull cur = 0;
        for(auto it : str) {
            cur = cur * 10 + it - '0';
        }
        dif[i] = cur - last;
        last = cur;
    }
    for(i = 0; i < n; i++) {
        fr[i / B].insert(dif[i]);
        aux[i] = dif[i];
    }
    vector <int> sol(n);
    for(int tt = 1; tt <= n; tt++) {
        i = (n - 1) / B;
        while(i > 0) {
            if(fr[i].find(1 + lazy[i]) != fr[i].end()) {
                break;
            }
            i--;
        }
        int pos;
        for(j = min(n - 1, (i + 1) * B - 1); j >= i * B; j--) {
            if(sol[j]) {
                continue;
            }
            if(aux[j] + lazy[i] == 1) {
                pos = j;
                break;
            }
        }
        sol[pos] = tt;
        for(j = pos; j < min(n, (i + 1) * B); j++) {
            fr[i].erase(fr[i].find(aux[j]));
            aux[j] -= dif[pos];
            fr[i].insert(aux[j]);
        }
        i++;
        while(i < (n - 1) / B) {
            lazy[i] += dif[pos];
            i++;
        }
        for(j = i * B; j < n; j++) {
            fr[i].erase(fr[i].find(aux[j]));
            aux[j] -= dif[pos];
            fr[i].insert(aux[j]);
        }
    }
    for(i = 0; i < n; i++) {
        cout << sol[i] << " ";
    }
    //cin.close();
    //cout.close();
    return 0;
}

Compilation message (stderr)

permutation.cpp: In function 'int main()':
permutation.cpp:53:13: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int pos;
             ^~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 0 / 18
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 7
• Subtask 7: 0 / 16
• Subtask 8: 0 / 6