제출 #1042007

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1042007		c2zi6	정렬하기 (IOI15_sorting)	C++14	100 / 100	212 ms	23848 KiB

sorting

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<typename T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#include "sorting.h"

#define ANSWER {\
        rep(i, ans.size()) {\
            P[i] = ans[i].ff;\
            Q[i] = ans[i].ss;\
        }\
        return ans.size();\
    }

struct PERM {
    int n;
    VI a;
    VI ind;
    PERM(int N_ARG) : n(N_ARG) {
        a = ind = VI(n);
        rep(i, n) a[i] = ind[i] = i;
    }
    PERM(VI A_ARG) : a(A_ARG) {
        n = a.size();
        ind = VI(n);
        rep(i, n) ind[a[i]] = i;
    }
    int size() {
        return n;
    }
    int& operator[](const int i) {
        return a[i];
    }
};

PERM operator*(const PERM& perm, const PII p) {
    auto[x, y] = p;
    PERM ret = perm;
    swap(ret.ind[ret[x]], ret.ind[ret[y]]);
    swap(ret[x], ret[y]);
    return ret;
}
void operator*=(PERM& perm, const PII p) {
    auto[x, y] = p;
    swap(perm.ind[perm[x]], perm.ind[perm[y]]);
    swap(perm[x], perm[y]);
}

VPI ans;
bool f(const VI& A_ARG, const VPI& op) {
    ans.clear();
    PERM a(A_ARG);
    int n = a.size();
    int m = op.size();
    PERM cur(n);
    reprl(i, m-1, 0) cur *= op[i];
    int i = 0;
    for (const PII& p : op) {
        cur *= p;
        a *= p;
        while (i < n && a.ind[i] == cur.ind[i]) i++;
        int x, y;
        if (i == n) {
            x = y = 0;
        } else {
            x = a.ind[i];
            y = cur.ind[i];
        }
        ans.pb({x, y});
        a *= mkp(x, y);
    }
    rep(i, n) if (a[i] != i) return false;
    return true;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    int n = N;
    int m = min(M, N);
    VI a(n);
    rep(i, n) a[i] = S[i];
    VPI op(m);
    rep(i, m) op[i] = mkp(X[i], Y[i]);

    auto func = [&](int x) {
        VPI curop;
        rep(i, x) curop.pb(op[i]);
        return f(a, curop);
    };

    int l = -1, r = m;
    while (l + 1 < r) {
        int m = (l + r) / 2;
        if (func(m)) r = m;
        else l = m;
    }
    func(r);
    ANSWER

    /*rep(i, m+1) {*/
    /*    if (f(a, curop)) {*/
    /*        ANSWER*/
    /*    }*/
    /*    if (i == m) break;*/
    /*    curop.pb(op[i]);*/
    /*}*/
    /*ANSWER;*/
}

컴파일 시 표준 에러 (stderr) 메시지

sorting.cpp: In constructor 'PERM::PERM(VI)':
sorting.cpp:51:19: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   51 |         n = a.size();
      |             ~~~~~~^~
sorting.cpp: In function 'PERM operator*(const PERM&, PII)':
sorting.cpp:64:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   64 |     auto[x, y] = p;
      |         ^
sorting.cpp: In function 'void operator*=(PERM&, PII)':
sorting.cpp:71:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   71 |     auto[x, y] = p;
      |         ^
sorting.cpp: In function 'bool f(const VI&, const VPI&)':
sorting.cpp:81:20: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   81 |     int m = op.size();
      |             ~~~~~~~^~
sorting.cpp:99:9: warning: declaration of 'i' shadows a previous local [-Wshadow]
   99 |     rep(i, n) if (a[i] != i) return false;
      |         ^
sorting.cpp:9:28: note: in definition of macro 'rep'
    9 | #define rep(i, n) for (int i = 0; i < int(n); ++i)
      |                            ^
sorting.cpp:84:9: note: shadowed declaration is here
   84 |     int i = 0;
      |         ^
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:119:13: warning: declaration of 'm' shadows a previous local [-Wshadow]
  119 |         int m = (l + r) / 2;
      |             ^
sorting.cpp:105:9: note: shadowed declaration is here
  105 |     int m = min(M, N);
      |         ^
sorting.cpp:39:24: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   39 |         return ans.size();\
      |                ~~~~~~~~^~
sorting.cpp:124:5: note: in expansion of macro 'ANSWER'
  124 |     ANSWER
      |     ^~~~~~

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