Submission #1249399

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249399		mondellbit	Souvenirs (IOI25_souvenirs)	C++20	Compilation error	0 ms	0 KiB

souvenirs

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

#define INF 1000000000000000000

vector<int> hidden_p;
vector<int> counter;

pair<vector<int>, int> transaction(int m) {
    vector<int> bought;
    for (int i = 0; i < hidden_p.size(); i++) {
        if (m >= hidden_p[i]) {
            m -= hidden_p[i];
            bought.push_back(i);
            counter[i]++;
        }
    }
    return make_pair(bought, m);
}

vector<int> buy_souvenirs(int n, int p0) {
    vector<set<int>> depend(n);
    vector<int> sum(n);
    vector<int> ans(n, -1);
    ans[0] = p0;
    
    counter.assign(n, 0);
    
    while (true) {
        int left = 0;
        for (int i = 0; i < n; i++) {
            left += ans[i] == -1;
        }
        
        if (left == 0) {
            break;
        }
        
        bool have = false;
        
        for (int i = n - 1; i >= 0; i--) {
            if (ans[i] == -1) have = true;
            if (ans[i] != -1 && have) {
                auto [vv, ll] = transaction(ans[i] - 1);
                set<int> ss;
                for (auto x : vv) ss.insert(x), counter[x]++;
                int got = ans[i] - 1 - ll;
                
                for (int j = 0; j < n; j++) {
                    if (ans[j] != -1 && ss.count(j)) {
                        ss.erase(j);
                        got -= ans[j];
                    }
                }
                
                depend[i + 1] = ss;
                sum[i + 1] = got;
                break;
            }
            if (depend[i].size() == 1) {
                ans[i] = sum[i];
                depend[i].clear();
                
                for (int j = 0; j < n; j++) {
                    if (depend[j].count(i)) {
                        sum[j] -= ans[i];
                        depend[j].erase(i);
                    }
                }
                break;
            }
            if (depend[i].size()) {
                int x = sum[i] / (int)depend[i].size();
                auto [vv, ll] = transaction(x);
                set<int> ss;
                for (auto x : vv) ss.insert(x), counter[x]++;
                
                int got = x - ll;
                
                for (int j = 0; j < n; j++) {
                    if (ans[j] != -1 && ss.count(j)) {
                        got -= ans[j];
                        ss.erase(j);
                    }
                }
                
                assert(!ss.empty());
                int k = *ss.begin();
                depend[k] = ss;
                sum[k] = got;
                break;
            }
        }
    }
    
    for (int i = 0; i < n; i++) {
        while (counter[i] < i) {
            counter[i]++;
            transaction(ans[i]);
        }
    }
    
    return ans;
}

vector<int> find_prices(int N) {
    hidden_p.resize(N);
    counter.assign(N, 0);
    
    // First find p0
    int low = 1, high = INF;
    int p0 = -1;
    
    while (low <= high) {
        int mid = (low + high) / 2;
        auto [bought, rem] = transaction(mid);
        
        if (bought.size() == 1 && bought[0] == 0) {
            p0 = mid;
            break;
        }
        else if (bought.size() > 0 && bought[0] == 0) {
            high = mid - 1;
        }
        else {
            low = mid + 1;
        }
    }
    
    // Now use the buy_souvenirs function
    vector<int> prices = buy_souvenirs(N, p0);
    return prices;
}

Compilation message (stderr)

souvenirs.cpp: In function 'std::vector<int> find_prices(int)':
souvenirs.cpp:5:13: warning: overflow in conversion from 'long int' to 'int' changes value from '1000000000000000000' to '-1486618624' [-Woverflow]
    5 | #define INF 1000000000000000000
      |             ^~~~~~~~~~~~~~~~~~~
souvenirs.cpp:112:25: note: in expansion of macro 'INF'
  112 |     int low = 1, high = INF;
      |                         ^~~
/usr/bin/ld: /tmp/ccpcd5nN.o: in function `main':
stub.cpp:(.text.startup+0x99): undefined reference to `buy_souvenirs(int, long long)'
collect2: error: ld returned 1 exit status