Submission #946334

#	Time	Username	Problem	Language	Result	Execution time	Memory
946334		Boycl07	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	103 ms	3664 KiB

merchant

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define rep(i, n) for(int i = 1; (i) <= (n); ++i)
#define forn(i, l, r) for(int i = (l); i <= (r); ++i)
#define ford(i, r, l) for(int i = (r); i >= (l); --i)
#define FOR(i, n) for(int i = 0; i < (n); ++i)
#define FORD(i, n) for(int i = ((n) - 1); i >= 0; --i)
#define fi first
#define se second
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define endl "\n"
#define task "merchant"
#define sz(a) int(a.size())
#define C(x, y) make_pair(x, y)
#define all(a) (a).begin(), (a).end()
#define bit(i, mask) (mask >> i & 1)

template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }

inline int readInt()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();int n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline ll readLong()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();ll  n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline string readString() {char c;while(c=getchar(),c==' '||c=='\n'||c=='\t');string s({c});while(c=getchar(),c!=EOF&&c!=' '&&c!='\n'&&c!='\t')s+=c;return s;}


const int N =  100 + 33;
const int M = 9900 + 33;
const int N1 = 2e3 + 10;
const int K = 1e3 + 10;
const int MOD = 1e9 + 7;
const int INF = 0x3f3f3f3f;
const ll LINF = 1e17 + 2;
const int block_size = 500;
const int LOG = 40;
const int offset = N;
const int LIM = 11 ;
const int AL = 26;

int n, m, num_market;

int b[N][K], s[N][K], w[M];
pii e[M];

ll max_path[N][N], d[N][N];

ll d_[N][N];

bool check(ll val)
{
    rep(i, n) rep(j, n)
    {
        if(d[i][j] != LINF)
            d_[i][j] = max_path[i][j] - val * d[i][j];
        else d_[i][j] = -LINF;
    }
    rep(k, n) rep(i, n) rep(j, n)
        maximize(d_[i][j], d_[i][k] + d_[k][j]);
    rep(i, n) if(d_[i][i] >= 0) return 1;
    return 0;
}

void solve()
{
    cin >> n >> m >> num_market;
    rep(i, n) rep(j, num_market) cin >> b[i][j] >> s[i][j];
    rep(i, m) cin >> e[i].fi >> e[i].se >> w[i];

    rep(i, n)
    {
        rep(j, n) d[i][j] = LINF;
        d[i][i] = 0;
    }

    rep(i, m)
        d[e[i].fi][e[i].se] = w[i];

    rep(k, n) rep(i, n) rep(j, n)
        minimize(d[i][j], d[i][k] + d[k][j]);
    rep(i, n) d[i][i] = LINF;
    rep(i, n) rep(j, n)
    {
        max_path[i][j] = 0;
        rep(k, num_market)
            if(b[i][k] != -1 && s[j][k] != -1)
                maximize(max_path[i][j], 1ll * s[j][k] - b[i][k]);
    }

    ll l = 1, r = 1e9, res = 0;
    while(l <= r)
    {
        ll mid = l + r >> 1;
        if(check(mid)) res = mid, l = mid + 1;
        else r = mid - 1;
    }
    cout << res;
}

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

    int TC = 1;

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


    while(TC--)
    {
        solve();
        cout << endl;
    }

    return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'void solve()':
merchant.cpp:97:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   97 |         ll mid = l + r >> 1;
      |                  ~~^~~
merchant.cpp: In function 'int main()':
merchant.cpp:113:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 21 / 21
• Subtask 3: 33 / 33
• Subtask 4: 34 / 34