Submission #920346

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define each(itr,c) for(__typeof(c.begin()) itr=c.begin(); itr!=c.end(); ++itr)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define fi first
#define se second

struct MaxSegTree{
    long n; vector<ll> dat;
    //初期化
    MaxSegTree(long _n){
        n=1;
        while(n<_n) n*=2;
        dat=vector<ll>(2*n-1,-1);
    }
    //k番目(0-indexed)の値をaに変更
    void update(long k, ll a){
        k+=n-1;
        dat[k]=a;
        //更新
        while(k>0){
            k=(k-1)/2;
            dat[k]=max(dat[2*k+1],dat[2*k+2]);
        }
    }
    //k番目(0-indexed)の値からaを引く
    void minus(long k, ll a){
        k+=n-1;
        dat[k]-=a;
        //更新
        while(k>0){
            k=(k-1)/2;
            dat[k]=max(dat[2*k+1],dat[2*k+2]);
        }
    }
    ll get(long idx)
    {
        return dat[idx+n-1];
    }
    //内部的に投げられるクエリ
    ll _query(long a, long b, long k, long l, long r){
        if(r<=a || b<=l) return -1;

        if(a<=l && r<=b) return dat[k];
        else{
            ll vl=_query(a,b,2*k+1,l,(l+r)/2);
            ll vr=_query(a,b,2*k+2,(l+r)/2,r);
            return max(vl,vr);
        }
    }
    //[a,b)の最大値を求める
    ll query(long a, long b){
        return _query(a,b,0,0,n);
    }
};

int main()
{
    int n;
    scanf(" %d", &n);

    MaxSegTree st(n);

    rep(i,n)
    {
        int a;
        scanf(" %d", &a);
        st.update(i,a);
    }

    ll ans=st.get(0)-1;
    st.update(0,1);


    for(int i=1; i<n; ++i)
    {
        ll p=st.query(0,i)+1;
        ll val=st.get(i);

        ll add=val/p;
        if(val%p==0) --add;
        if(add==0) continue;

        val-=(add-1)*p;
        ans+=add;
        st.update(i,1);

        // printf(" --- %d end , p= %lld\n", i,p);
        // rep(j,n) printf(" %lld\n", st.get(j));
        // printf("  ans = %lld\n", ans);
    }

    cout << ans << endl;
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:64:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf(" %d", &n);
                     ^
./Main.cpp:71:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf(" %d", &a);
                         ^

Judge Result