Submission #115028

#	Time	Username	Problem	Language	Result	Execution time	Memory
115028		MladenP	Sorting (IOI15_sorting)	C++17	0 / 100	19 ms	512 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], idxx, idx[MAXN];
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[idxx] = node;
        q[idxx] = s[node];
        idxx++;
        DFS1(s[node]);
    }
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    n = N, m = M; int rez;
    for(int i = 0; i < N; i++) s[i] = S[i], idx[s[i]] = i;
    for(int i = 0; i < M; i++) {
        swap(s[X[i]], s[Y[i]]);
        //swap(idx[s[X[i]], idx[s[Y[i]]]);
        for(int j = 0; j < N; j++) pos[j] = 0;
        int cnt = 0;
        for(int j = 0; j < N; j++) {
            if(!pos[j]) DFS(j), cnt++;
        }
        //PRINT(n-cnt);
        //PRINT(i);
        if(n-cnt <= i+1) {
            rez = i+1;
            for(int j = 0; j < N; j++) pos[j] = 0;
            for(int j = 0; j < N; j++) {
                if(!pos[j]) DFS1(j);
            }
            for(int j = 0; j < idxx; j++) P[j] = p[j], Q[j] = q[j];
            for(int j = idxx; j < i; j++) P[j] = 0, Q[j] = 0;
            break;
        }
    }//
    for(int i = 0; i < rez; i++) {
        swap(S[X[i]], S[Y[i]]);
        /*for(int j = 0; j < N; j++) cout << S[j] << ' ';
        cout << endl;
        for(int j = 0; j < N; j++) cout << idx[j] << ' ';
        cout << endl;*/
        swap(idx[S[X[i]]], idx[S[Y[i]]]);
        P[i] = idx[s[P[i]]], Q[i] = idx[s[Q[i]]];
        swap(S[P[i]], S[Q[i]]);
        swap(idx[S[P[i]]], idx[S[Q[i]]]);
    }
    return rez;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:69:12: warning: 'rez' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return rez;
            ^~~

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