Submission #153689

#	Time	Username	Problem	Language	Result	Execution time	Memory
153689		semiauto	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	100 / 100	2971 ms	262144 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;
int n,m,i,j,l,r,ans,N=1024*1024;
int mas[1000001],val[1000001],tree[2048*1024];
pair <int,int> p[1000001][20];
vector <int> v[1000001];
inline int maxi(int a,int b) {
    if (a>b)
        return a;
    return b;
}
void dfs(int u) {
    int i;
    for (i=1;i<20;++i)
        if (p[p[u][i-1].first][i-1].first)
            p[u][i]={p[p[u][i-1].first][i-1].first,maxi(p[u][i-1].second,p[p[u][i-1].first][i-1].second)};
    for (i=0;i<(v[u].size());++i)
        dfs(v[u][i]);
}
int solve(int x,int y,int p,int l,int r) {
    if (l>y || x>r)
        return 0;
    if (l>=x && r<=y)
        return tree[p];
    return maxi(solve(x,y,2*p,l,(l+r)/2),solve(x,y,2*p+1,(l+r)/2+1,r));
}
void build_tree(int p) {
    if (p>=N) {
        if ((p-N+1)<=n)
            tree[p]=mas[p-N+1];
        return;
    }
    build_tree(2*p);
    build_tree(2*p+1);
    tree[p]=maxi(tree[2*p],tree[2*p+1]);
}
int main() {
    scanf("%d %d",&n,&m);
    for (i=1;i<=n;++i)
        scanf("%d",&(mas[i]));
    build_tree(1);
    for (i=n;i>0;--i) {
        for (;r>0;--r)
            if (mas[val[r]]>=mas[i])
                break;
        p[i][0].first=val[r];
        if (val[r]>(i+1))
            p[i][0].second=mas[i]+solve(i+1+N-1,val[r]-1+N-1,1,N,2*N-1);
        v[val[r]].push_back(i);
        val[++r]=i;
    }
    for (i=0;i<(v[0].size());++i)
        dfs(v[0][i]);
    for (mas[0]=1;mas[0]<=m;++mas[0]) {
        scanf("%d %d %d",&l,&r,&j);
        if (l==r) {
            printf("1\n");
            continue;
        }
        ans=0;
        for (i=19;i>=0;--i)
            if (p[l][i].first && p[l][i].first<=r) {
                ans=maxi(ans,p[l][i].second);
                l=p[l][i].first;
            }
        if (r>l)
            ans=maxi(ans,mas[l]+solve(l+1+N-1,r+N-1,1,N,2*N-1));
        if (ans>j)
            printf("0\n");
        else
            printf("1\n");
    }
}

Compilation message (stderr)

sortbooks.cpp: In function 'void dfs(int)':
sortbooks.cpp:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i=0;i<(v[u].size());++i)
              ~^~~~~~~~~~~~~~
sortbooks.cpp: In function 'int main()':
sortbooks.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i=0;i<(v[0].size());++i)
              ~^~~~~~~~~~~~~~
sortbooks.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~
sortbooks.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&(mas[i]));
         ~~~~~^~~~~~~~~~~~~~~~
sortbooks.cpp:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d",&l,&r,&j);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 30 / 30
• Subtask 6: 23 / 23