Submission #225701

#	Time	Username	Problem	Language	Result	Execution time	Memory
225701		LittleFlowers__	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	284 ms	4472 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0);
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define bit(x,i) ((x>>(i-1))&1)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1<<(i-1)))
#define gg exit(0);

const int N=110,
          K=1010,
          INF=1e15;

int n,m,k;
int buy[N][K],sell[N][K];
int to[N][N],inc[N][N];
long double f[N][N];


int chk(int val){
    forinc(i,1,n) forinc(j,1,n) if(to[i][j]<INF) f[i][j]=(long double)inc[i][j]-(long double)to[i][j]*val; else f[i][j]=-INF;
    forinc(t,1,n) forinc(i,1,n) forinc(j,1,n) f[i][j]=max(f[i][j],f[i][t]+f[t][j]);
	forinc(i,1,n) if(f[i][i]>=0) return 1;
	return 0;
}


main(){
    #define task "merchant"
    //freopen(task".inp","r",stdin);
    //freopen(task".out","w",stdout);

    n=in,m=in,k=in;
    forinc(i,1,n) forinc(j,1,k) buy[i][j]=in, sell[i][j]=in;
    forinc(i,1,n)  forinc(j,1,n) to[i][j]=INF;
    forinc(i,1,m){
        int u=in,v=in;
        to[u][v]=min(to[u][v],in);
    }
    forinc(t,1,n) forinc(i,1,n) forinc(j,1,n) to[i][j]=min(to[i][j],to[i][t]+to[t][j]);
    forinc(t,1,k) forinc(i,1,n) forinc(j,1,n) if(sell[j][t]>0 && buy[i][t]>0) inc[i][j]=max(inc[i][j],sell[j][t]-buy[i][t]);
    int le=1,mi,ri=1e9,ret=0;
    while(le<=ri){
        mi=(le+ri)/2;
        if(chk(mi)) ret=mi, le=mi+1; else ri=mi-1;
    }
    cout<<ret<<"\n";
}

Compilation message (stderr)

merchant.cpp:41:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

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