Submission #320492

#	Time	Username	Problem	Language	Result	Execution time	Memory
320492		qpwoeirut	Permutation Recovery (info1cup17_permutation)	C++17	10 / 100	5 ms	4972 KiB

Main

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int MN = 70001;

struct BigInt {
    vector<int> digits;
    bool done;

    BigInt() {
        digits = vector<int>();
        done = false;
    }
    BigInt(const string s) {
        digits = vector<int>(s.size());
        for (int i=0; i<s.size(); ++i) {
            digits[i] = (s[i] - '0');
        }
        reverse(digits.begin(), digits.end());
        done = false;
    }
    BigInt(ll x) {
        digits = vector<int>();
        while (x) {
            digits.push_back(x % 10);
            x /= 10;
        }
        reverse(digits.begin(), digits.end());
        done = false;
    }

    inline const BigInt operator+(const BigInt& other) const {
        const int n = max(digits.size(), other.digits.size());
        BigInt ret;
        ret.digits = vector<int>(n);
        bool carry = false;
        for (int i=0; i<digits.size() || i<other.digits.size(); ++i) {
            int x = i < digits.size() ? digits[i] : 0;    
            int y = i < other.digits.size() ? other.digits[i] : 0;    

            ret.digits[i] = (x + y + carry) % 10;
            carry = (x + y + carry) >= 10;
        }
        if (carry) {
            ret.digits.push_back(1);
        }
        return ret;
    }

    inline const BigInt operator-(const BigInt& other) const {
        const int n = max(digits.size(), other.digits.size());
        BigInt ret;
        ret.digits = vector<int>(n);
        for (int i=n; i>=0; --i) { 
            int x = i < digits.size() ? digits[i] : 0;    
            int y = i < other.digits.size() ? other.digits[i] : 0;    

            ret.digits[i] = x - y;
        }
        for (int i=0; i<ret.digits.size(); ++i) {
            if (ret.digits[i] < 0) {
                ret.digits[i] += 10;
                --ret.digits[i+1];
            }
        }
        while (ret.digits.back() == 0) ret.digits.pop_back();
        if (ret.digits.empty()) ret.digits.push_back(0);
        return ret;
    }
    inline const bool operator<(const BigInt& other) const {
        if (digits.size() != other.digits.size()) {
            return digits.size() < other.digits.size();
        }

        if (digits.empty()) return false;
        for (int i=digits.size() - 1; i>=0; --i) {
            if (digits[i] != other.digits[i]) {
                return digits[i] < other.digits[i];
            }
        }
        return false;
    }
    inline const bool operator==(const BigInt& other) const {
        return !(*this < other) && !(other < *this);
    }
    void print() {
        for (int i=digits.size() - 1; i>=0; --i) {
            cout << digits[i];
        }
        cout << endl;
    }
};

int N;
BigInt A[MN];
int pos[MN];

int main() {
    cin.tie(0)->sync_with_stdio(0);

    cin >> N;
    for (int i=0; i<N; ++i) {
        string s;
        cin >> s;
        A[i] = BigInt(s);
    }

    for (int i=N-1; i>0; --i) {
        A[i] = A[i] - A[i-1];
    }

    list<int> order;
    for (int i=0; i<N; ++i) {
        BigInt cur(1);
        for (auto it=order.begin(); it!=order.end(); ++it) {
            if (cur == A[i]) {
                order.insert(it, i);
                cur.done = true;
                break;
            }
            cur = cur + A[*it];
        }
        if (!cur.done && cur == A[i]) {
            order.push_back(i);
            cur.done = true;
        }

        assert(cur.done);
        //cerr << "order:";for (auto it=order.begin(); it!=order.end(); ++it) {cerr << ' ' << *it;} cerr << endl;
    }

    int idx = 0;
    for (auto it=order.begin(); it!=order.end(); ++it) {
        pos[*it] = ++idx;
    }
    for (int i=0; i<N; ++i) {
        if (i) cout << ' ';
        cout << pos[i];
    }
    cout << endl;
}

Compilation message (stderr)

permutation.cpp: In constructor 'BigInt::BigInt(std::string)':
permutation.cpp:19:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |         for (int i=0; i<s.size(); ++i) {
      |                       ~^~~~~~~~~
permutation.cpp: In member function 'const BigInt BigInt::operator+(const BigInt&) const':
permutation.cpp:40:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for (int i=0; i<digits.size() || i<other.digits.size(); ++i) {
      |                       ~^~~~~~~~~~~~~~
permutation.cpp:40:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for (int i=0; i<digits.size() || i<other.digits.size(); ++i) {
      |                                          ~^~~~~~~~~~~~~~~~~~~~
permutation.cpp:41:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |             int x = i < digits.size() ? digits[i] : 0;
      |                     ~~^~~~~~~~~~~~~~~
permutation.cpp:42:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |             int y = i < other.digits.size() ? other.digits[i] : 0;
      |                     ~~^~~~~~~~~~~~~~~~~~~~~
permutation.cpp: In member function 'const BigInt BigInt::operator-(const BigInt&) const':
permutation.cpp:58:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |             int x = i < digits.size() ? digits[i] : 0;
      |                     ~~^~~~~~~~~~~~~~~
permutation.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |             int y = i < other.digits.size() ? other.digits[i] : 0;
      |                     ~~^~~~~~~~~~~~~~~~~~~~~
permutation.cpp:63:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for (int i=0; i<ret.digits.size(); ++i) {
      |                       ~^~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 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