제출 #724961

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
724961		dooompy	Arranging Shoes (IOI19_shoes)	C++17	100 / 100	232 ms	34424 KiB

shoes

#include "bits/stdc++.h"
#include "shoes.h"

using namespace std;

void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cout << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    while (l != r) cout << *l << " \n"[++l == r];
}
template <typename A, typename B> istream& operator >> (istream& o, pair<A, B> &a) {
    return o >> a.first >> a.second;
}
template <typename A, typename B> ostream& operator << (ostream& o, pair<A, B> a) {
    return o << '(' << a.first << ", " << a.second << ')';
}
template <typename T> ostream& operator << (ostream& o, vector<T> a) {
    bool is = false;
    for (T i : a) {o << (is ? ' ' : '{'), is = true, o << i;}
    return o << '}';
}

#ifdef local
#define test(args...) abc("[" + string(#args) + "]", args)
#else
#define test(args...) void(0)
#endif

using ll = long long;

map<int, vector<int>> m;

vector<pair<int, int>> pairs;

int bit[300005];

void add(int p, int v) {
    p++;
    for (int i = p; i < 300005; i+= i & -i) bit[i] += v;
}

ll res(int p) {
    p++;
    ll sum = 0;
    for (; p; p -= p & -p) {
        sum += bit[p];
    }
    return sum;
}

long long count_swaps(vector<int> s) {
    for (int i = 0; i < s.size(); i++) {
        m[s[i]].push_back(i);
    }
    ll ans = 0;

    for (int i = 1; i <= s.size(); i++) {
        for (int j = 0; j < m[i].size(); j++) {
            int x = m[i][j], y = m[-i][j];

            if (x < y) ans++;
            else swap(x, y);

            pairs.push_back({x, y});

        }
    }
sort(pairs.begin(), pairs.end());

    for (int i = 0; i < s.size(); i++) add(i, 1);

    for (auto [a, b] : pairs) {
        add(a, -1);
        add(b, -1);
        ans += res(b);
    }

    return ans;

}

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~
shoes.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for (int i = 1; i <= s.size(); i++) {
      |                     ~~^~~~~~~~~~~
shoes.cpp:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         for (int j = 0; j < m[i].size(); j++) {
      |                         ~~^~~~~~~~~~~~~
shoes.cpp:72:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |     for (int i = 0; i < s.size(); i++) add(i, 1);
      |                     ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 15 / 15