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Submission #583751

# Submission time Handle Problem Language Result Execution time Memory
583751 2022-06-26T07:31:50 Z InternetPerson10 Sorting (IOI15_sorting) C++17
74 / 100
 1000 ms 18232 KB 
#include "sorting.h"
#include <bits/stdc++.h>

using namespace std;

bool trySwapPairs(int n, int S[], int m, int X[], int Y[], int P[], int Q[]) {
    vector<int> targetArr(n);
    vector<int> revInd(n);
    int countMatches = 0;
    for(int i = 0; i < n; i++) {
        targetArr[i] = i;
        if(S[i] == i) countMatches++;
    }
    for(int i = m-1; i >= 0; i--) {
        swap(targetArr[X[i]], targetArr[Y[i]]);
    }
    for(int i = 0; i < n; i++) {
        revInd[targetArr[i]] = i;
    }
    unordered_set<int> notGood; // Indices of places where no match
    for(int i = 0; i < n; i++) {
        if(S[i] != targetArr[i]) notGood.insert(i);
    }
    auto swapTwo = [&](int i, int a, int b) {
        if(a == S[a]) countMatches--;
        if(b == S[b]) countMatches--;
        swap(S[a], S[b]);
        P[i] = a; Q[i] = b;
        if(a == S[a]) countMatches++;
        if(b == S[b]) countMatches++;
    };
    for(int i = 0; i < m; i++) {
        if(countMatches == n) {
            m = i;
            break;
        }
        if(X[i] != Y[i]) {
            int x = (int)notGood.count(X[i]);
            int y = (int)notGood.count(Y[i]);
            if(X[i] == S[X[i]]) countMatches--;
            if(Y[i] == S[Y[i]]) countMatches--;
            swap(revInd[targetArr[X[i]]], revInd[targetArr[Y[i]]]);
            swap(targetArr[X[i]], targetArr[Y[i]]);
            swap(S[X[i]], S[Y[i]]);
            notGood.erase(X[i]);
            notGood.erase(Y[i]);
            if(x) notGood.insert(Y[i]);
            if(y) notGood.insert(X[i]);
            if(X[i] == S[X[i]]) countMatches++;
            if(Y[i] == S[Y[i]]) countMatches++;
        }
        if(notGood.size() == 0) {
            swapTwo(i, 0, 0);
            continue;
        }
        int a = *(notGood.begin());
        int b = revInd[S[a]];
        swapTwo(i, a, b);
        assert(S[b] == targetArr[b]);
        if(S[a] == targetArr[a]) notGood.erase(a);
        if(S[b] == targetArr[b]) notGood.erase(b);
    }
    return (countMatches == n);
}

int findSwapPairs(int n, int R[], int m, int X[], int Y[], int P[], int Q[]) {
    int V[200001];
    int l = -1, r = m;
    while(l != r - 1) {
        for(int i = 0; i < n; i++) {
            V[i] = R[i];
        }
        int mid = (l + r + 1) / 2;
        if(trySwapPairs(n, V, mid, X, Y, P, Q)) r = mid;
        else l = mid;
    }
    trySwapPairs(n, R, r, X, Y, P, Q);
    return r;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 1 ms 980 KB Output is correct
4 Correct 1 ms 980 KB Output is correct
5 Correct 1 ms 980 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 1 ms 980 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 1 ms 980 KB Output is correct
4 Correct 1 ms 980 KB Output is correct
5 Correct 1 ms 980 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 1 ms 980 KB Output is correct
8 Correct 1 ms 980 KB Output is correct
9 Correct 1 ms 980 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 1 ms 1108 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 1 ms 1108 KB Output is correct
4 Correct 1 ms 1108 KB Output is correct
5 Correct 1 ms 1108 KB Output is correct
6 Correct 1 ms 980 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 1 ms 980 KB Output is correct
4 Correct 1 ms 980 KB Output is correct
5 Correct 1 ms 980 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 1 ms 980 KB Output is correct
8 Correct 1 ms 980 KB Output is correct
9 Correct 1 ms 980 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 1 ms 1108 KB Output is correct
13 Correct 1 ms 980 KB Output is correct
14 Correct 1 ms 980 KB Output is correct
15 Correct 1 ms 1108 KB Output is correct
16 Correct 1 ms 1108 KB Output is correct
17 Correct 1 ms 1108 KB Output is correct
18 Correct 1 ms 980 KB Output is correct
19 Correct 1 ms 980 KB Output is correct
20 Correct 1 ms 980 KB Output is correct
21 Correct 4 ms 1236 KB Output is correct
22 Correct 3 ms 1236 KB Output is correct
23 Correct 3 ms 1236 KB Output is correct
24 Correct 3 ms 1272 KB Output is correct
25 Correct 3 ms 1236 KB Output is correct
26 Correct 3 ms 1236 KB Output is correct
27 Correct 3 ms 1236 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1236 KB Output is correct
2 Correct 8 ms 1268 KB Output is correct
3 Correct 6 ms 1236 KB Output is correct
4 Correct 2 ms 1224 KB Output is correct
5 Correct 3 ms 1236 KB Output is correct
6 Correct 4 ms 1236 KB Output is correct
7 Correct 6 ms 1236 KB Output is correct
8 Correct 7 ms 1236 KB Output is correct
9 Correct 7 ms 1248 KB Output is correct
10 Correct 6 ms 1236 KB Output is correct
11 Correct 7 ms 1236 KB Output is correct
12 Correct 5 ms 1236 KB Output is correct
13 Correct 6 ms 1236 KB Output is correct
14 Correct 1 ms 1108 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1236 KB Output is correct
2 Correct 8 ms 1268 KB Output is correct
3 Correct 6 ms 1236 KB Output is correct
4 Correct 2 ms 1224 KB Output is correct
5 Correct 3 ms 1236 KB Output is correct
6 Correct 4 ms 1236 KB Output is correct
7 Correct 6 ms 1236 KB Output is correct
8 Correct 7 ms 1236 KB Output is correct
9 Correct 7 ms 1248 KB Output is correct
10 Correct 6 ms 1236 KB Output is correct
11 Correct 7 ms 1236 KB Output is correct
12 Correct 5 ms 1236 KB Output is correct
13 Correct 6 ms 1236 KB Output is correct
14 Correct 1 ms 1108 KB Output is correct
15 Execution timed out 1093 ms 18232 KB Time limit exceeded
16 Halted 0 ms 0 KB -