Submission #538642

#	Time	Username	Problem	Language	Result	Execution time	Memory
538642		ddy888	Cloud Computing (CEOI18_clo)	C++17	100 / 100	490 ms	1284 KiB

clo

#undef _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long 
#define pb push_back
#define fi first
#define si second
#define ar array
typedef pair<int,int> pi;
typedef tuple<int,int,int> ti;  
void debug_out() {cerr<<endl;}
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {cerr<<" "<<to_string(H);debug_out(T...);}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:",debug_out(__VA_ARGS__)

struct event {
    int c, f, v, flag;
} items[5010];

const int INF = 1e18, lim = 100010;
int N, M, st, ans = 0;
int dp[100010];

signed main() {
    cin >> N;
    for (int i = 1; i <= N; ++i) {
        cin >> items[i].c >> items[i].f >> items[i].v;
        items[i].flag = 1;
    }
    cin >> M;
    for (int i = N + 1; i <= N + M; ++i) {
        cin >> items[i].c >> items[i].f >> items[i].v;
        items[i].flag = 0;
    }
    sort(items + 1, items + 1 + N + M, [](event a, event b) {
        if (a.f == b.f) return a.flag > b.flag;
        return a.f > b.f;
    });
    for (int i = 0; i <= lim; ++i) dp[i] = -INF;
    dp[0] = 0;
    for (int i = 1; i <= N + M; ++i) {
        if (items[i].flag) {
            for (int j = lim - 1; j >= 0; --j) {
                int index = j + items[i].c;
                int profit = dp[j] - items[i].v;
                if (index < lim) dp[index] = max(dp[index], profit);
            }
        } else {
            for (int j = 0; j < lim; ++j) {
                int index = j - items[i].c;
                int profit = dp[j] + items[i].v;
                if (index >= 0 && dp[j] != -INF) dp[index] = max(dp[index], profit);
            }
        }
    } // push dp
    for (int i = 0; i < lim; ++i) ans = max(ans, dp[i]);
    cout << ans;
    return 0;
}

Compilation message (stderr)

clo.cpp: In function 'int main()':
clo.cpp:40:42: warning: iteration 100010 invokes undefined behavior [-Waggressive-loop-optimizations]
   40 |     for (int i = 0; i <= lim; ++i) dp[i] = -INF;
      |                                    ~~~~~~^~~~~~
clo.cpp:40:23: note: within this loop
   40 |     for (int i = 0; i <= lim; ++i) dp[i] = -INF;
      |                     ~~^~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 18 / 18
• Subtask 3: 18 / 18
• Subtask 4: 18 / 18
• Subtask 5: 18 / 18
• Subtask 6: 10 / 10