제출 #231046

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
231046		JooDdae	역사적 조사 (JOI14_historical)	C++17	25 / 100	4011 ms	13560 KiB

historic

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


const ll sz = 1000000;

char in_buf[sz];
char out_buf[sz];

inline char read_next()
{
    static ll i = sz;
    if (i == sz)
    {
        fread(in_buf, 1, sz, stdin);
        i = 0;
    }
    return in_buf[i++];
}

inline ll read_int()
{
    ll r = read_next() - '0';
    char ch;
    while ((ch = read_next()) >= '0' && ch <= '9')
        r = r * 10 + ch - '0';
    return r;
}

ll w_idx;
inline void write_next(char ch)
{
    if (w_idx == sz)
    {
        fwrite(out_buf, 1, sz, stdout);
        w_idx = 0;
    }
    out_buf[w_idx++] = ch;
}

inline void write_int(ll x)
{
    char s[10];
    ll i = 0;

    do {
        s[i++] = x % 10;
        x /= 10;
    } while (x > 0);

    i--;
    while (i >= 0)
        write_next(s[i--] + '0');
}

#define mid ((l+r)>>1)
struct query{
    int l, r, id;
    bool operator < (const query &o) const{
        return make_pair(l>>9, r) < make_pair(o.l >> 9, o.r);
    }
}q[100100];
int n, m, cnt;
ll x[100100], tree[400400], ans[100100];
map<ll, int> mp;

void update(int id, ll val, int node = 1, int l = 1, int r = cnt){
    if(id < l || r < id) return;
    if(l == r){
        tree[node] += val;
        return;
    }
    update(id, val, node*2, l, mid), update(id, val, node*2+1, mid+1, r);
    tree[node] = max(tree[node*2], tree[node*2+1]);
}

int main(){
    n = read_int();
    m = read_int();
    for(int i=1;i<=n;i++) x[i] = read_int(), mp[x[i]] = 0;
    for(auto &x : mp) x.second = ++cnt;

    for(int i=1;i<=m;i++) q[i].l = read_int(), q[i].r = read_int(), q[i].id = i;
    sort(q+1, q+1+m);
    
    int l = 1, r = 0;
    for(int i=1;i<=m;i++){
        while(l > q[i].l) l--, update(mp[x[l]], x[l]);
        while(r < q[i].r) r++, update(mp[x[r]], x[r]);
        while(l < q[i].l) update(mp[x[l]], -x[l]), l++;
        while(r > q[i].r) update(mp[x[r]], -x[r]), r--;

        ans[q[i].id] = tree[1];
    }
    for(int i=1;i<=m;i++){write_int(ans[i]); write_next('\n');}
    fwrite(out_buf, 1, w_idx, stdout);
}

컴파일 시 표준 에러 (stderr) 메시지

historic.cpp: In function 'char read_next()':
historic.cpp:16:14: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         fread(in_buf, 1, sz, stdin);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 25 / 25
• Subtask 4: 0 / 60