Submission #115021

#	Time	Username	Problem	Language	Result	Execution time	Memory
115021		MladenP	Sorting (IOI15_sorting)	C++17	0 / 100	166 ms	696 KiB

sorting

#include<bits/stdc++.h>
#define STIZE(x) fprintf(stderr, "STIZE%d\n", x);
#define PRINT(x) fprintf(stderr, "%s = %d\n", #x, x);
#define NL(x) printf("%c", " \n"[(x)]);
#define lld long long
#define pii pair<int,int>
#define pb push_back
#define fi first
#define se second
#define mid (l+r)/2
#define endl '\n'
#define all(a) begin(a),end(a)
#define sz(a) int((a).size())
#define LINF 1000000000000000LL
#define INF 1000000000
#define EPS 1e-9
using namespace std;
#define MAXN 200010
int n, s[MAXN], m, x[MAXN], y[MAXN], p[MAXN], q[MAXN], idx;
bool pos[MAXN];
void DFS(int node) {
    pos[node] = 1;
    if(!pos[s[node]]) DFS(s[node]);
}
void DFS1(int node) {
    pos[node] = 1;
    if(!pos[s[node]]) {
        p[idx] = node;
        q[idx] = s[node];
        idx++;
        DFS1(s[node]);
    }
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    n = N, m = M;
    for(int i = 0; i < N; i++) s[i] = S[i];
    for(int i = 0; i < M; i++) x[i] = X[i], y[i] = Y[i];
    for(int i = 0; i < M; i++) {
        swap(s[x[i]], s[y[i]]);
        fill(pos, pos+MAXN, 0);
        int cnt = 0;
        for(int j = 0; j < N; j++) {
            if(!pos[j]) DFS(j), cnt++;
        }
        if(n-cnt <= i) {
            fill(pos, pos+MAXN, 0);
            for(int j = 0; j < N; j++) {
                if(!pos[j]) DFS1(j);
            }
            for(int j = 0; j < idx; j++) P[j] = p[j], Q[j] = q[j];
            for(int j = idx; j < i; j++) P[j] = 0, Q[j] = 0;
            return i+1;
        }
    }
}
/*
int main() {
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0); cerr.tie(0);
    cin >> n;
    for(int i = 0; i < n; i++) cin >> s[i];
    cin >> m;
    for(int i = 0; i < m; i++) cin >> x[i] >> y[i];
    int r = findSwapPairs(n, s, m, x, y, p, q);
    cout << r << endl;
    for(int i = 0; i < r; i++) cout << p[i] << ' ' << q[i] << endl;
}
*/

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:55:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26