Submission #115038

#	Time	Username	Problem	Language	Result	Execution time	Memory
115038		MladenP	Sorting (IOI15_sorting)	C++17	74 / 100	43 ms	14840 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]);
    }
}
bool check(int key) {
    for(int i = 0; i < key; i++) swap(s[x[i]], s[y[i]]);
    for(int i = 0; i < n; i++) pos[i] = 0;
    int cnt = 0;
    for(int i = 0; i < n; i++) {
        if(!pos[i]) DFS(i), cnt++;
    }
    return n-cnt <= key;
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    n = N, m = M; int rez = M, l = 1, r = M;
    bool sorted = 1;
    for(int i = 0; i < N; i++) if(S[i] != i) sorted = 0;
    for(int i = 0; i < M; i++) x[i] = X[i], y[i] = Y[i];
    if(sorted) return 0;
    for(int i = 0; i < N; i++) s[i] = S[i], idx[s[i]] = i;
    while(l <= r) {
        if(check(mid)) rez = mid, r = mid-1;
        else l = mid+1;

        for(int i = 0; i < n; i++) s[i] = S[i];
    }
    for(int i = 0; i < rez; i++) swap(s[X[i]], s[Y[i]]);
    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 < rez; j++) P[j] = 0, Q[j] = 0;
    for(int i = 0; i < rez; i++) {
        swap(S[X[i]], S[Y[i]]);
        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;
}

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