Submission #388249

#	Time	Username	Problem	Language	Result	Execution time	Memory
388249		ACmachine	Sorting (IOI15_sorting)	C++17	74 / 100	1088 ms	22464 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)

const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;

template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "[";  REP(i, U) out << v[i] << ", ";  out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}

template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }

int trivial_sort(int n, vector<int> &positions, vector<int>& P, vector<int> &Q){
    int id = 0;
    REP(i, n){
        REP(j, n){
            if(positions[j] == i){
                if(j != i){
                    swap(positions[i], positions[j]);
                    P[id] = positions[i]; Q[id] = positions[j];
                    id++;
                    break;
                }
            }
        }
    }
    return id;
}
void adapt(vector<int> &init, vector<int> &X, vector<int> &Y, vector<int> &P, vector<int> &Q){
    vector<int> pos(init.size());
    REP(i, init.size()){
        pos[init[i]] = i;
    }
    auto swap2 = [&](int a, int b){
        swap(init[a], init[b]);
        pos[init[a]] = a;
        pos[init[b]] = b;
    };
    REP(i, X.size()){
        swap2(X[i], Y[i]);
        P[i] = pos[P[i]];
        Q[i] = pos[Q[i]];
        swap2(P[i], Q[i]);
    }
}
int findSwapPairs(int n, int S[], int m, int X[], int Y[], int P[], int Q[]) {
    vector<int> nX(m);
    vector<int> nY(m);
    REP(i, m){
        nX[i] = X[i]; nY[i] = Y[i];
    }
	int ans = INF;
	int l = 0;
	int r = m - 1;
	vector<int> init_arr(n);
	vector<int> arr(n);
	REP(i, n) init_arr[i] = S[i];
	vector<int> nP(m);
	vector<int> nQ(m);

	while(l <= r){
	    fill(all(nP), 0);
	    fill(all(nQ), 0);
	    arr = init_arr;
        int mid = (l + r) >> 1;
        REP(i, mid){
            swap(arr[X[i]], arr[Y[i]]);
        }
        int num = trivial_sort(n, arr, nP, nQ);
        if(num <= mid){
            ans = mid;
            r = mid - 1;
        }
        else{
            l = mid + 1;
        }
	}

	//ans = 3;
    fill(all(nP), 0);
    fill(all(nQ), 0);
    arr = init_arr;
    REP(i, ans){
        swap(arr[X[i]], arr[Y[i]]);
    }
	trivial_sort(n, arr, nP, nQ);
	adapt(init_arr, nX, nY, nP, nQ);
	REP(i, ans) {P[i] = nP[i]; Q[i] = nQ[i];}
	return ans;
}

Compilation message (stderr)

sorting.cpp: In function 'void adapt(std::vector<int>&, std::vector<int>&, std::vector<int>&, std::vector<int>&, std::vector<int>&)':
sorting.cpp:20:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
      |                                        ^
sorting.cpp:22:18: note: in expansion of macro 'FOR'
   22 | #define REP(i,b) FOR(i,0,b,1)
      |                  ^~~
sorting.cpp:76:5: note: in expansion of macro 'REP'
   76 |     REP(i, init.size()){
      |     ^~~
sorting.cpp:20:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
      |                                        ^
sorting.cpp:22:18: note: in expansion of macro 'FOR'
   22 | #define REP(i,b) FOR(i,0,b,1)
      |                  ^~~
sorting.cpp:84:5: note: in expansion of macro 'REP'
   84 |     REP(i, X.size()){
      |     ^~~

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