oj.uz

Submission #601936

# Submission time Handle Problem Language Result Execution time Memory
601936 2022-07-22T12:40:02 Z PiejanVDC Sorting (IOI15_sorting) C++17
74 / 100
 1000 ms 18980 KB 
#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;

int findSwapPairs(int n, int s[], int m, int X[], int Y[], int P[], int Q[]) {
    auto sorted = [&] (vector<int>&v) -> bool {
        for(int i = 0 ; i < n ; i++)
            if(v[i] != i)
                return 0;
        return 1;
    };
    int ans;
    int l = 0, r = m;
    while(l <= r) {
        int T = (l+r)/2;
        //cout << "T : " << T << '\n';
        vector<int>c(n);
        for(int i = 0 ; i < n ; i++) c[i]= i;
        for(int i = 0 ; i < T ; i++)
            swap(c[X[i]], c[Y[i]]);
        vector<int>go(n, -1);
        for(int i = 0 ; i < n ; i++) {
            //assert(go[c[i]] == -1);
            go[c[i]] = i;
        }
        vector<int>v(n);
        auto S = [&] (int W) {
            for(int i = 0 ; i < n ; i++)
                if(v[i] == W)
                    return i;
            //assert(0);
        };
        vector<int>P_(m), Q_(m);
        for(int i = 0 ; i < n ; i++) v[i] = s[i];
        int cnt = 0;
        for(int i = 0 ; i < T ; i++) {
            cnt++;
            swap(v[X[i]], v[Y[i]]);
            swap(go[X[i]], go[Y[i]]);
            int j;
            for(j = 0 ; j < n ; j++) {
                if(go[j] != v[j]) {
                    int p = S(go[j]);
                    P_[cnt-1] = p;
                    Q_[cnt-1] = j;
                    swap(v[p], v[j]);
                    break;
                }
            }
            /*cout << "    " << i << '\n';
            cout << "    ";
            for(auto z : v)
                cout << z << ' ';
            cout << '\n';*/
            if(j == n)
                P_[cnt-1] = 0, Q_[cnt-1] = 0;
            // do the swappings
            // look for first element not correct in go
        }
        if(sorted(v)) {
            r = T-1;
            for(int i_ = 0 ; i_ < cnt ; i_++)
                P[i_] = P_[i_], Q[i_] = Q_[i_];
            ans = cnt;
        } else l = T+1;
    }
   return ans;
}

Compilation message

sorting.cpp: In lambda function:
sorting.cpp:32:9: warning: control reaches end of non-void function [-Wreturn-type]
   32 |         };
      |         ^
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:67:11: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   67 |    return ans;
      |           ^~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 304 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 340 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 304 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 308 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 300 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 6 ms 700 KB Output is correct
22 Correct 7 ms 700 KB Output is correct
23 Correct 6 ms 692 KB Output is correct
24 Correct 7 ms 596 KB Output is correct
25 Correct 6 ms 684 KB Output is correct
26 Correct 7 ms 596 KB Output is correct
27 Correct 8 ms 724 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 424 KB Output is correct
2 Correct 26 ms 504 KB Output is correct
3 Correct 21 ms 476 KB Output is correct
4 Correct 7 ms 476 KB Output is correct
5 Correct 7 ms 468 KB Output is correct
6 Correct 8 ms 468 KB Output is correct
7 Correct 15 ms 468 KB Output is correct
8 Correct 23 ms 500 KB Output is correct
9 Correct 28 ms 500 KB Output is correct
10 Correct 26 ms 500 KB Output is correct
11 Correct 21 ms 508 KB Output is correct
12 Correct 14 ms 440 KB Output is correct
13 Correct 23 ms 440 KB Output is correct
14 Correct 8 ms 384 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 424 KB Output is correct
2 Correct 26 ms 504 KB Output is correct
3 Correct 21 ms 476 KB Output is correct
4 Correct 7 ms 476 KB Output is correct
5 Correct 7 ms 468 KB Output is correct
6 Correct 8 ms 468 KB Output is correct
7 Correct 15 ms 468 KB Output is correct
8 Correct 23 ms 500 KB Output is correct
9 Correct 28 ms 500 KB Output is correct
10 Correct 26 ms 500 KB Output is correct
11 Correct 21 ms 508 KB Output is correct
12 Correct 14 ms 440 KB Output is correct
13 Correct 23 ms 440 KB Output is correct
14 Correct 8 ms 384 KB Output is correct
15 Execution timed out 1041 ms 18980 KB Time limit exceeded
16 Halted 0 ms 0 KB -