Submission #1302454

#	Time	Username	Problem	Language	Result	Execution time	Memory
1302454		nhmktu	만두 (JOI14_ho_t2)	C++17	100 / 100	11 ms	720 KiB

2014_ho_t2

#include <bits/stdc++.h>
#define ll long long
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define ROF(i,a,b) for(int i=a;i>=b;i--)
#define pi pair<int,int>
#define pii pair<int,pi>
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(a) (int) a.size()
#define endl '\n'
#define data "data"

using namespace std;
const ll linf = 1e18;
const int inf = 1e9;
const int MOD = 1e9 + 7, N = 1e4;

void add(int &a, int b)
{
    a += b;
    if(a>=MOD)
        a-=MOD;
    if(a<0)
        a += MOD;
}

int modulo(int x)
{
    if(x<=1)
        return 1;
    return (MOD - MOD/x) * modulo(MOD/x) % MOD;
}

int mul(int a, int b)
{
    return (1ll *a%MOD * b%MOD) % MOD;
}

int n, m;
int p[N+3];
pi box[503];
ll dp[2][N+3];
ll pref[N+3];

void inp(void)
{
    cin >> n >> m;
    FOR(i, 1, n) cin >> p[i];
    FOR(i, 1, m) cin >> box[i].fi >> box[i].se;
}

void solve(void)
{
    sort(p+1, p+n+1, greater<int>());
    memset(dp, -0x3f, sizeof(dp));
    dp[0][0] = 0;
    FOR(i, 1, n) pref[i] = pref[i-1] + 1ll * p[i];
    FOR(i, 1, m)
    {
        int cur = i & 1;
        int pre = !cur;

        FOR(j, 0, n) dp[cur][j] = dp[pre][j];
        FOR(j, 0, n)
        {
            int k = j - box[i].fi;
            k = max(0, k);
            if(dp[pre][k] < -linf) continue;
            ll cost = pref[j] - pref[k] - box[i].se;
            dp[cur][j] = max(dp[cur][j], dp[pre][k] + cost);
        }
    }

    ll ans = 0;
    FOR(i, 1, n) ans = max(ans, dp[m & 1][i]);
    cout << ans;
}

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

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

    inp();
    solve();
    return 0;
}

Compilation message (stderr)

2014_ho_t2.cpp: In function 'int main()':
2014_ho_t2.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(data".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
2014_ho_t2.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen(data".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 35 / 35
• Subtask 3: 40 / 40