oj.uz

Submission #999798

# Submission time Handle Problem Language Result Execution time Memory
999798 2024-06-16T07:05:26 Z whatthemomooofun1729 Sorting (IOI15_sorting) C++17
100 / 100
 158 ms 21936 KB 
#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#include <stack>
#include <map>
#include <queue>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cstring>
#include <cmath>
#include <functional>
#include <cassert>
#include <iomanip>
#include <numeric>
#include <bitset>
#include <sstream>
#include <chrono>
#include <random>

#define ff first
#define ss second
#define PB push_back
#define sz(x) int(x.size())
#define rsz resize
#define fch(xxx, yyy) for (auto xxx : yyy) // abusive notation
#define all(x) (x).begin(),(x).end()
#define eps 1e-9

// more abusive notation (use at your own risk):
//#define int ll

using namespace std;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
using vll = vector<ll>;

// debugging
void __print(int x) {std::cerr << x;}
void __print(ll x) {std::cerr << x;} /* remember to uncomment this when not using THE MACRO */
void __print(unsigned x) {std::cerr << x;}
void __print(ull x) {std::cerr << x;}
void __print(float x) {std::cerr << x;}
void __print(double x) {std::cerr << x;}
void __print(ld x) {std::cerr << x;}
void __print(char x) {std::cerr << '\'' << x << '\'';}
void __print(const char *x) {std::cerr << '\"' << x << '\"';}
void __print(const string& x) {std::cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V> void __print(const pair<T, V> &x) {std::cerr << '{'; __print(x.ff); std::cerr << ", "; __print(x.ss); std::cerr << '}';}
template<typename T> void __print(const T& x) {int f = 0; std::cerr << '{'; for (auto &i: x) std::cerr << (f++ ? ", " : ""), __print(i); std::cerr << "}";}
void _print() {std::cerr << "]\n";}
template <typename T, typename... V> void _print(T t, V... v) {__print(t); if (sizeof...(v)) std::cerr << ", "; _print(v...);}
void println() {std::cerr << ">--------------------<" << endl;}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

// templates
template <class T> bool ckmin(T &a, const T &b) {return b<a ? a = b, 1 : 0;}
template <class T> bool ckmax(T &a, const T &b) {return b>a ? a = b, 1 : 0;}
template <class T> using gr = greater<T>;
template <class T> using vc = vector<T>;
template <class T> using p_q = priority_queue<T>;
template <class T> using pqg = priority_queue<T, vc<T>, gr<T>>;
template <class T1, class T2> using pr = pair<T1, T2>;
mt19937_64 rng_ll(chrono::steady_clock::now().time_since_epoch().count());
int rng(int M) {return (int)(rng_ll()%M);} /*returns any random number in [0, M) */

// const variables
constexpr int INF = (int)2e9;
constexpr int MOD = 998244353;
constexpr ll LL_INF = (ll)3e18;
constexpr int mod = (int)1e9 + 7;
constexpr ll inverse = 500000004LL; // inverse of 2 modulo 1e9 + 7

void setIO(const string& str) {// fast input/output
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (str.empty()) return;
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
}

int findSwapPairs(int N, int* s, int M, int* x, int* y, int* p, int* q) {
    vc<pii> ans;
    int l = 0, r = M;
    while (l <= r) {
        int mid = (l + r)/2;
        vi v(N);
        for (int i = 0; i < N; ++i) {
            v[i] = s[i];
        }
        for (int i = 0; i < mid; ++i) {
            swap(v[x[i]], v[y[i]]); // swapping the apples
        }
        vc<pii> ops;
        for (int i = 0; i < N; ++i) {
            while (v[i] != i) {
                ops.PB({v[i], v[v[i]]});
                swap(v[i], v[v[i]]);
            }
        }
        if (sz(ops) <= mid) {
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }
    r++;
    vi v(N);
    for (int i = 0; i < N; ++i) {
        v[i] = s[i];
    }
    for (int i = 0; i < r; ++i) {
        swap(v[x[i]], v[y[i]]); // swapping the apples
    }
    for (int i = 0; i < N; ++i) {
        while (v[i] != i) {
            ans.PB({v[i], v[v[i]]});
            swap(v[i], v[v[i]]);
        }
    }
    while (sz(ans) < r) {
        ans.PB({0, 0});
    }
    vi idx(N);
    for (int i = 0; i < N; ++i) {
        idx[s[i]] = i;
        v[i] = s[i];
    }
    for (int i = 0; i < r; ++i) {
        swap(v[x[i]], v[y[i]]);
    }
    for (int i = 0; i < r; ++i) {
        swap(idx[s[x[i]]], idx[s[y[i]]]);
        swap(s[x[i]], s[y[i]]);
        p[i] = idx[v[ans[i].ff]], q[i] = idx[v[ans[i].ss]];
        swap(idx[s[p[i]]], idx[s[q[i]]]);
        swap(s[p[i]], s[q[i]]);
    }
    return r;
}

/*
int N, M;
int S[10];
int x[10], y[10];
int p[10], q[10];


 FAILING TEST CASE:
 11
8 1 3 9 5 10 6 4 2 7 0
11
0 3
6 2
9 8
3 10
0 6
7 9
10 1
0 6
0 10
4 8
3 4

 */
/*
signed main() { // TIME YOURSELF !!!
    setIO("");
    int T = 50000;
    while (T--) {
        N = rng(11) + 1;
        vi s(N);
        iota(all(s), 0);
        unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
        shuffle(s.begin(), s.end(), default_random_engine(seed));
        for (int i = 0; i < N; ++i) {
            S[i] = s[i];
        }
        memset(x, 0, sizeof(x));
        memset(y, 0, sizeof(y));
        memset(p, 0, sizeof(p));
        memset(q, 0, sizeof(q));
        M = N;
        for (int i = 0; i < M; ++i) {
            x[i] = rng(N), y[i] = rng(N);
        }
        int ans = findSwapPairs(N, S, M, x, y, p, q);
        for (int i = 0; i < N; ++i) {
            S[i] = s[i];
        }
        for (int i = 0; i < ans; ++i) {
            swap(S[x[i]], S[y[i]]);
            swap(S[p[i]], S[q[i]]);
        }
        for (int i = 0; i < N; ++i) {
            if (i && S[i] < S[i-1]) {
                debug(N, M);
                for (int j = 0; j < N; ++j) {
                    cerr << S[j] << ' ';
                }
                cerr << '\n';
                for (int j = 0; j < M; ++j) {
                    cerr << x[j] << ' ' << y[j] << '\n';
                }
                cerr << "NOOOOOOO. Solution fails: \n";
                debug(ans);
                for (int j = 0; j < ans; ++j) {
                    debug(j, p[j], q[j]);
                }
                return 0;
            }
        }
    }
    return 0;*/
/*
    cin >> N;
    vi s(N);
    for (int i = 0; i < N; ++i) {
        cin >> S[i];
        s[i] = S[i];
    }
    cin >> M;
    for (int i = 0; i < M; ++i) {
        cin >> x[i] >> y[i];
    }
    int ans = findSwapPairs(N, S, M, x, y, p, q);
    debug(ans);
    debug(s);
    for (int i = 0; i < ans; ++i) {
        debug(i);
        debug(x[i], y[i]);
        debug(s);
        swap(s[x[i]], s[y[i]]);
        debug(s);
        debug(p[i], q[i]);
        debug(s);
        swap(s[p[i]], s[q[i]]);
        debug(s);
    }
    return 0;
}
*/
// TLE -> TRY NOT USING DEFINE INT LONG LONG
// CE -> CHECK LINE 45
// 5000 * 5000 size matrices are kinda big (potential mle)
// Do something, start simpler

Compilation message

sorting.cpp: In function 'void setIO(const string&)':
sorting.cpp:88:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sorting.cpp:89:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 2 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 2 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 127 ms 10808 KB Output is correct
16 Correct 138 ms 18628 KB Output is correct
17 Correct 154 ms 19600 KB Output is correct
18 Correct 56 ms 17116 KB Output is correct
19 Correct 92 ms 18544 KB Output is correct
20 Correct 100 ms 19340 KB Output is correct
21 Correct 100 ms 19240 KB Output is correct
22 Correct 144 ms 16216 KB Output is correct
23 Correct 141 ms 20128 KB Output is correct
24 Correct 151 ms 21388 KB Output is correct
25 Correct 148 ms 19580 KB Output is correct
26 Correct 106 ms 18028 KB Output is correct
27 Correct 92 ms 19028 KB Output is correct
28 Correct 146 ms 19872 KB Output is correct
29 Correct 147 ms 19608 KB Output is correct
30 Correct 72 ms 17076 KB Output is correct
31 Correct 141 ms 19612 KB Output is correct
32 Correct 145 ms 19652 KB Output is correct
33 Correct 146 ms 19936 KB Output is correct
34 Correct 147 ms 19996 KB Output is correct
35 Correct 92 ms 18308 KB Output is correct
36 Correct 40 ms 15692 KB Output is correct
37 Correct 155 ms 21936 KB Output is correct
38 Correct 145 ms 19648 KB Output is correct
39 Correct 158 ms 19884 KB Output is correct