Submission #1081744

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081744		SugarCubes69	September (APIO24_september)	C++17	0 / 100	1018 ms	3160 KiB

september

#include "september.h"
#include <bits/stdc++.h>
using namespace std;
int deg[100005];
int fst[100005],lst[100005];
vector<int> adj[100005];

void dfs(int x){
    for(int child:adj[x]){
        dfs(child);
        lst[x] = max(lst[x],lst[child]);
    }
}

int solve(int n, int m, vector<int> P, vector<vector<int> > a)
{
    for(int i=1;i<n;i++) adj[P[i]].push_back(i);
    fill(fst,fst+n,n);
    memset(lst,0,sizeof(lst));
    for(int i=0;i<m;i++) for(int j=0;j<n-1;j++){
        fst[a[i][j]] = min(fst[a[i][j]],j);
        lst[a[i][j]] = max(lst[a[i][j]],j);
    }
    dfs(0);

    vector<pair<int,int> > intervals;
    for(int i=1;i<n;i++) intervals.push_back(pair<int,int>(fst[i],lst[i]));
    sort(intervals.begin(),intervals.end());

    int ans = 0;
    int bak = -1;
    for(int i=0;i<intervals.size();i++){
        if(bak < intervals[i].first){
            ans++;
        }
        bak = max(bak,intervals[i].second);
    }
    return ans;
}

Compilation message (stderr)

september.cpp: In function 'int solve(int, int, std::vector<int>, std::vector<std::vector<int> >)':
september.cpp:32:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(int i=0;i<intervals.size();i++){
      |                 ~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 5
• Subtask 4: 0 / 9
• Subtask 5: 0 / 5
• Subtask 6: 0 / 11
• Subtask 7: 0 / 9
• Subtask 8: 0 / 11
• Subtask 9: 0 / 9
• Subtask 10: 0 / 16