oj.uz

Submission #999633

# Submission time Handle Problem Language Result Execution time Memory
999633 2024-06-16T01:30:35 Z Gilgamesh Sorting (IOI15_sorting) C++17
100 / 100
 171 ms 13344 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.emplace_back(v[i], v[v[i]]);
                swap(v[i], v[v[i]]);
            }
        }
        if (ops.size() <= mid) {
            r = mid;
        } else {
            l = mid + 1;
        }
    }
    r = l;
    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
    }
    int moves = 0;
    for (int i = 0; i < N; ++i) {
        while(v[i] != i) {
            ans.emplace_back(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 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:111:24: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int>, std::allocator<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  111 |         if (ops.size() <= mid) {
      |             ~~~~~~~~~~~^~~~~~
sorting.cpp:125:9: warning: unused variable 'moves' [-Wunused-variable]
  125 |     int moves = 0;
      |         ^~~~~
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 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 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 344 KB Output is correct

Subtask #2
12.0 / 12.0

# 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 0 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 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 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 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 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 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 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 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 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 0 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 344 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 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 348 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 2 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 1 ms 344 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 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 2 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 1 ms 344 KB Output is correct
15 Correct 126 ms 10760 KB Output is correct
16 Correct 129 ms 12316 KB Output is correct
17 Correct 164 ms 11440 KB Output is correct
18 Correct 47 ms 9236 KB Output is correct
19 Correct 88 ms 10096 KB Output is correct
20 Correct 90 ms 10632 KB Output is correct
21 Correct 92 ms 12288 KB Output is correct
22 Correct 126 ms 11548 KB Output is correct
23 Correct 145 ms 11644 KB Output is correct
24 Correct 141 ms 11424 KB Output is correct
25 Correct 171 ms 12840 KB Output is correct
26 Correct 99 ms 9212 KB Output is correct
27 Correct 89 ms 10592 KB Output is correct
28 Correct 137 ms 11416 KB Output is correct
29 Correct 132 ms 11084 KB Output is correct
30 Correct 64 ms 8568 KB Output is correct
31 Correct 132 ms 12724 KB Output is correct
32 Correct 154 ms 11444 KB Output is correct
33 Correct 141 ms 11480 KB Output is correct
34 Correct 143 ms 11464 KB Output is correct
35 Correct 87 ms 10108 KB Output is correct
36 Correct 36 ms 7244 KB Output is correct
37 Correct 141 ms 13344 KB Output is correct
38 Correct 140 ms 11524 KB Output is correct
39 Correct 139 ms 12828 KB Output is correct