LOJ#6279. 数列分块入门 3

区间加值还是正常的操作，查找前驱的时候用lower_bound查找，然后范围所在位置的值

#include<map>
#include<set>
#include<ctime>
#include<cmath>
#include<stack>
#include<queue>
#include<string>
#include<vector>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<iostream>
#include<algorithm>
#define first fi
#define second se
#define lowbit(x) (x & (-x))

typedef unsigned long long int ull;
typedef long long int ll;
const double pi = 4.0*atan(1.0);
const int inf = 0x3f3f3f3f;
const int maxn = 100005;
const int maxm = 100000;
const int mod = 998244353;
using namespace std;

int n, m, tol, T;
int block;
int a[maxn];
int b[maxn];
int add[maxn];
int belong[maxn];

void init() {
    memset(a, 0, sizeof a);
    memset(add, 0, sizeof a);
    memset(belong, 0, sizeof belong);
}

int L(int x) {
    return (x-1)*block+1;
}

int R(int x) {
    return min(x*block, n);
}

void sor(int x) {
    for(int i=L(x); i<=R(x); i++) {
        a[i] += add[x];
        b[i] = a[i];
    }
    add[x] = 0;
    sort(b+L(x), b+R(x)+1);
}

void update(int l, int r, int c) {
    for(int i=l; i<=min(r, R(belong[l])); i++)    a[i] += c;
    sor(belong[l]);
    if(belong[l] == belong[r])    return;
    if(belong[l] != belong[r]) {
        for(int i=L(belong[r]); i<=r; i++)    a[i] += c;
        sor(belong[r]);
    }
    for(int i=belong[l]+1; i<belong[r]; i++)    add[i] += c;
}

int query(int l, int r, int c) {
    int ans = -inf;
    for(int i=l; i<=min(r, R(belong[l])); i++) {
        if(a[i] + add[belong[i]]< c)    ans = max(ans, a[i] + add[belong[i]]);
    }
    if(belong[l] != belong[r]) {
        for(int i=L(belong[r]); i<=r; i++) {
            if(a[i] + add[belong[i]] < c)    ans = max(ans, a[i] + add[belong[i]]);
        }
    }
    for(int i=belong[l]+1; i<belong[r]; i++) {
        int pl = L(i);
        int pr = R(i);
        if(b[pl] + add[i] >= c)    continue;
        int pos = lower_bound(b+L(i), b+R(i)+1, c - add[i]) - b - 1;
        while(b[pos] + add[i] >= c) {
            pos--;
        }
        ans = max(ans, b[pos] + add[i]);
    }
    return ans == -inf ? -1 : ans;
}

int main() {
    while(~scanf("%d", &n)) {
        init();
        block = sqrt(n);
        int num = n / block + (n % block == 1);
        for(int i=1; i<=n; i++)    {
            scanf("%d", &a[i]);
            belong[i] = (i-1) / block + 1;
        }
        for(int i=1; i<=num; i++)    sor(i);
        m = n;
        while(m--) {
            int op, l, r, c;
            scanf("%d%d%d%d", &op, &l, &r, &c);
            if(op == 0) {
                update(l, r, c);
            } else {
                int ans = query(l, r, c);
                printf("%d
", ans);
            }
        }
    }
    return 0;
}