Submission #1051002

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051002		manhlinh1501	Sterilizing Spray (JOI15_sterilizing)	C++17	100 / 100	121 ms	4444 KiB

sterilizing

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
const int MAXN = 1e5 + 5;

int N, Q, K;
int a[MAXN];

struct segment_tree {
    int N;
    i64 tree[MAXN * 4];

    void build(int id, int l, int r) {
        if(l == r) {
            tree[id] = a[r];
            return;
        }
        int m = (l + r) / 2;
        build(id * 2, l, m);
        build(id * 2 + 1, m + 1, r);
        tree[id] = tree[id * 2] + tree[id * 2 + 1];
    }

    void init(int _N) {
        N = _N;
        build(1, 1, N);
    }

    void update(int id, int l, int r, int u, int v) {
        if(r < u or l > v or tree[id] == 0) return;
        if(u <= l and r <= v) {
            if(l == r)
                tree[id] /= K;
            else if(tree[id] > 0 and K > 1) {
                int m = (l + r) / 2;
                update(id * 2, l, m, u, v);
                update(id * 2 + 1, m + 1, r, u, v);
                tree[id] = tree[id * 2] + tree[id * 2 + 1];
            }
            return;
        }
        int m = (l + r) / 2;
        update(id * 2, l, m, u, v);
        update(id * 2 + 1, m + 1, r, u, v);
        tree[id] = tree[id * 2] + tree[id * 2 + 1];
    }

    void updatep(int p, int x) {
        int l = 1, r = N, id = 1;
        while(l < r) {
            int m = (l + r) / 2;
            if(p <= m) {
                id = id * 2;
                r = m;
            } else {
                id = id * 2 + 1;
                l = m + 1;
            }
        }
        tree[id] = x;
        while(id >= 1) {
            id >>= 1;
            tree[id] = tree[id * 2] + tree[id * 2 + 1];
        }
    }

    void update(int l, int r) {
        return update(1, 1, N, l, r);
    }

    i64 get(int id, int l, int r, int u, int v) {
        if(r < u or l > v or tree[id] == 0) return 0;
        if(u <= l and r <= v) return tree[id];
        int m = (l + r) / 2;
        return get(id * 2, l, m, u, v) + get(id * 2 + 1, m + 1, r, u, v);
    }

    i64 get(int l, int r) {
        return get(1, 1, N, l, r);
    }
} ST;

signed main() {
#define TASK "code"

    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> N >> Q >> K;

    for(int i = 1; i <= N; i++) cin >> a[i];

    ST.init(N);

    while(Q--) {
        int type;
        cin >> type;
        if(type == 1) {
            int p, x;
            cin >> p >> x;
            ST.updatep(p, x);
        } else if(type == 2) {
            int l, r;
            cin >> l >> r;
            ST.update(l, r);
        } else if(type == 3) {
            int l, r;
            cin >> l >> r;
            cout << ST.get(l, r) << "\n";
        }
    }

    return (0 ^ 0);
}

Compilation message (stderr)

sterilizing.cpp: In function 'int main()':
sterilizing.cpp:87:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sterilizing.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 75 / 75