Submission #949603

#	Time	Username	Problem	Language	Result	Execution time	Memory
949603		ace5	Rope (JOI17_rope)	C++17	100 / 100	804 ms	81748 KiB

rope

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1000001;

vector<int> cc[maxn];
int us[maxn];
int a[maxn];
int u[maxn];
int me[maxn];
int ans[maxn];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,m;
    cin >> n >> m;
    for(int j = 0;j < n;++j)
    {
        cin >> a[j];
        a[j]--;
        cc[a[j]].push_back(j);
    }
    for(int j = 0;j < m;++j)
    {
        me[j] = j;
        u[j] = cc[j].size();
        ans[j] = n+1;
    }
    sort(me,me+m,[&](int a,int b){return u[a] > u[b];});
    if(m == 1)
    {
        cout << 0;
        return 0;
    }
    for(int j = 0;j < m;++j)
    {
        us[j] = 1;
        int op = u[j];
        int xx = 0;
        for(int k = 0;k < cc[j].size();++k)
        {
            if(cc[j][k] == n-1 && n%2 == 1)
                break;
            int pr = a[cc[j][k]^1];
            us[pr] = 1;
            u[pr]--;
        }
        for(int k = 0;k < cc[j].size();++k)
        {
            if(cc[j][k] == n-1 && n%2 == 1)
                break;
            int pr = a[cc[j][k]^1];
            if(pr != j)
                xx = max(xx,u[pr]);
        }
        for(int j = 0;j < m;++j)
        {
            if(!us[me[j]])
            {
                xx = max(xx,u[me[j]]);
                break;
            }
        }
        ans[j] = min(ans[j],n-op-xx);
        for(int k = 0;k < cc[j].size();++k)
        {
            if(cc[j][k] == n-1 && n%2 == 1)
                break;
            int pr = a[cc[j][k]^1];
            us[pr] = 0;
            u[pr]++;
        }
        us[j] = 0;
    }
    for(int j = 0;j < m;++j)
    {
        us[j] = 1;
        int op = u[j];
        int xx = 0;
        for(int k = 0;k < cc[j].size();++k)
        {
            if(cc[j][k] == n-1 && n%2 == 0)
                break;
            if(cc[j][k] == 0)
                continue;
            int pr = a[((cc[j][k]-1)^1)+1];
            us[pr] = 1;
            u[pr]--;
        }
        for(int k = 0;k < cc[j].size();++k)
        {
            if(cc[j][k] == n-1 && n%2 == 0)
                break;
            if(cc[j][k] == 0)
                continue;
            int pr = a[((cc[j][k]-1)^1)+1];
            if(pr != j)
                xx = max(xx,u[pr]);
        }
        for(int j = 0;j < m;++j)
        {
            if(!us[me[j]])
            {
                xx = max(xx,u[me[j]]);
                break;
            }
        }
        ans[j] = min(ans[j],n-op-xx);
        for(int k = 0;k < cc[j].size();++k)
        {
            if(cc[j][k] == n-1 && n%2 == 0)
                break;
            if(cc[j][k] == 0)
                continue;
            int pr = a[((cc[j][k]-1)^1)+1];
            us[pr] = 0;
            u[pr]++;
        }
        us[j] = 0;
        cout << ans[j] << "\n";
    }
    return 0;
}

Compilation message (stderr)

rope.cpp: In function 'int main()':
rope.cpp:43:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         for(int k = 0;k < cc[j].size();++k)
      |                       ~~^~~~~~~~~~~~~~
rope.cpp:51:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |         for(int k = 0;k < cc[j].size();++k)
      |                       ~~^~~~~~~~~~~~~~
rope.cpp:68:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         for(int k = 0;k < cc[j].size();++k)
      |                       ~~^~~~~~~~~~~~~~
rope.cpp:83:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |         for(int k = 0;k < cc[j].size();++k)
      |                       ~~^~~~~~~~~~~~~~
rope.cpp:93:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |         for(int k = 0;k < cc[j].size();++k)
      |                       ~~^~~~~~~~~~~~~~
rope.cpp:112:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |         for(int k = 0;k < cc[j].size();++k)
      |                       ~~^~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 30 / 30
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 20 / 20