Submission #334804

#	Time	Username	Problem	Language	Result	Execution time	Memory
334804		juggernaut	Nice sequence (IZhO18_sequence)	C++14	76 / 100	2047 ms	42088 KiB

sequence

#include<bits/stdc++.h>
using namespace std;
int n,m,len,pref[1000005];
bool vis[1000005];
vector<int>top;
void dfs(int v){
    vis[v]=1;
    if(v-m>=0&&!vis[v-m])dfs(v-m);
    if(v+n<=len&&!vis[v+n])dfs(v+n);
    top.push_back(v);
}
bool check(int x){
    len=x;
    top.clear();
    for(int i=0;i<=len;i++)vis[i]=0;
    for(int i=0;i<=len;i++)if(!vis[i])dfs(i);
    for(int i=0;i<=len;i++)pref[top[i]]=i;
    for(int i=0;i<=len;i++){
        if(i-m>=0&&pref[i]<=pref[i-m])return false;
        if(i+n<=len&&pref[i]<=pref[i+n])return false;
    }
    return true;
}
int main(){
    int test;
    scanf("%d",&test);
    while(test--){
        scanf("%d%d",&n,&m);
        int l=0,r=500000;
        while(l<r){
            int mid=(l+r+1)>>1;
            if(check(mid))l=mid;
            else r=mid-1;
        }
        check(l);
        printf("%d\n",l);
        if(l){
            for(int i=1;i<=l;i++)printf("%d ",pref[i]-pref[i-1]);
            puts("");
        }
    }
}

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |     scanf("%d",&test);
      |     ~~~~~^~~~~~~~~~~~
sequence.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |         scanf("%d%d",&n,&m);
      |         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 14 / 14
• Subtask 6: 18 / 18
• Subtask 7: 0 / 24