Submission #768981

#	Time	Username	Problem	Language	Result	Execution time	Memory
768981		nguyentunglam	Two Dishes (JOI19_dishes)	C++17	10 / 100	8 ms	596 KiB

dishes

#include<bits/stdc++.h>
#define fi first
#define se second
#define endl "\n"
#define ii pair<int, int>
using namespace std;
const int N = 2010;
long long a[N], b[N], s[N], t[N], p[N], q[N];
long long f[N];
vector<int> event[N];
int n, m;

void up(int j, int x) {
    long long sum = 0;
    for(int i = j; i >= 1; i--) {
        if (x <= t[i]) sum += q[i];
        f[j] = max(f[j], f[i - 1] + sum);
    }
}

int main() {
    #define task ""
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen ("task.inp", "r")) {
        freopen ("task.inp", "r", stdin);
        freopen ("task.out", "w", stdout);
    }
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    cin >> n >> m;
    for(int i = 1; i <= n; i++) {
        cin >> a[i] >> s[i] >> p[i];
        p[i] = p[i];
        a[i] += a[i - 1];
    }
    for(int i = 1; i <= m; i++) {
        cin >> b[i] >> t[i] >> q[i];
        q[i] = q[i];
        b[i] += b[i - 1];
    }
    for(int i = 1; i <= n; i++) {
        int l = 0, r = m, last = -1;
        while (l <= r) {
            int mid = l + r >> 1;
            if (a[i] + b[mid] <= s[i]) {
                last = mid;
                l = mid + 1;
            }
            else r = mid - 1;
        }
        s[i] = last;
    }
    for(int i = 1; i <= m; i++) {
        int l = 0, r = n, last = -1;
        while (l <= r) {
            int mid = l + r >> 1;
            if (b[i] + a[mid] <= t[i]) {
                last = mid;
                l = mid + 1;
            }
            else r = mid - 1;
        }
        t[i] = last;
        if (last >= 0) event[last].push_back(i);
    }
    for(int i = 1; i <= m; i++) f[i] = -1e9;
    for(int i = 1; i <= n; i++) {
        for(int &j : event[i - 1]) up(j, i - 1);
        up(s[i] + 1, i - 1);
        for(int j = 0; j <= s[i]; j++) f[j] += p[i];
//        for(int j = 0; j <= m; j++) cout << f[j] << " ";
    }
    up(m, n);
    cout << f[m];
}

Compilation message (stderr)

dishes.cpp: In function 'int main()':
dishes.cpp:46:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |             int mid = l + r >> 1;
      |                       ~~^~~
dishes.cpp:58:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   58 |             int mid = l + r >> 1;
      |                       ~~^~~
dishes.cpp:25:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         freopen ("task.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dishes.cpp:26:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         freopen ("task.out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
dishes.cpp:29:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dishes.cpp:30:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 3 / 3
• Subtask 3: 7 / 7
• Subtask 4: 0 / 39
• Subtask 5: 0 / 11
• Subtask 6: 0 / 9
• Subtask 7: 0 / 17
• Subtask 8: 0 / 9