Submission #979782

#	Time	Username	Problem	Language	Result	Execution time	Memory
979782		someone	Fish 3 (JOI24_fish3)	C++14	100 / 100	805 ms	73272 KiB

Main

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

const int M = 1 << 19, N = 2 * M, INF = 1e15 + 42;

struct Query {
    int l, r, val = 0;
};

int sum[N], tag[N];

void applyOp(int i, int len, int add) {
    sum[i] += len * add;
    tag[i] += add;
}

void propage(int i, int len) {
    applyOp(i*2, len, tag[i]);
    applyOp(i*2+1, len, tag[i]);
    tag[i] = 0;
}

int update(int i, int deb, int fin, int l, int r, int add) {
    if(fin <= l || r <= deb) return 0;
    if(l <= deb && fin <= r) {
        applyOp(i, fin - deb, add);
        return sum[i];
    }
    int mid = (deb + fin) >> 1;
    propage(i, mid - deb);
    int ans = update(i*2, deb, mid, l, r, add) + update(i*2+1, mid, fin, l, r, add);
    sum[i] = sum[i*2] + sum[i*2+1];
    return ans;
}

Query req[M];
vector<int> id[M];
int n, q, d, c[M], prefD[M], zero[M], nbD[M];

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> d;
    for(int i = 1; i <= n; i++)
        cin >> c[i];
    cin >> q;
    for(int i = 0; i < q; i++) {
        cin >> req[i].l >> req[i].r;
        id[req[i].r].push_back(i);
        req[i].r++;
    }
    for(int i = n; i > 0; i--) {
        zero[i] = zero[i+1];
        if(c[i] % d > c[i+1] % d)
            zero[i]++;
        nbD[i] = c[i] / d + zero[i];
        prefD[i] = nbD[i];
    }
    for(int i = 1; i <= n; i++)
        prefD[i] += prefD[i-1];

    deque<int> imin;
    nbD[0] = -INF;
    imin.push_back(0);
    for(int i = 1; i <= n; i++) {
        while(nbD[imin[0]] > nbD[i]) {
            update(1, 0, M, imin[1]+1, imin[0]+1, - nbD[imin[0]]);
            imin.pop_front();
        }
        update(1, 0, M, imin[0]+1, i+1, nbD[i]);
        imin.push_front(i);
        for(int iQ : id[i]) {
            if(update(1, 0, M, req[iQ].l, req[iQ].l+1, 0) < zero[req[iQ].l]) {
                req[iQ].val = -1;
            } else {
                req[iQ].val = prefD[req[iQ].r-1] - prefD[req[iQ].l-1] - update(1, 0, M, req[iQ].l, req[iQ].r, 0);
            }
        }
    }
    for(int i = 0; i < q; i++)
        cout << req[i].val << '\n';
}

• Subtask 1: 9 / 9
• Subtask 2: 7 / 7
• Subtask 3: 28 / 28
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36