Submission #402140

#	Time	Username	Problem	Language	Result	Execution time	Memory
402140		juggernaut	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	115 ms	3392 KiB

merchant

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
typedef long long ll;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef IOI2021SG
    #define printl(args...)printf(args)
#else
    #define printl(args...)((void)0)
#endif
const ll inf=1e18;
const int N=105;
const int K=1050;
int b[N][K],s[N][K],p[N][N];
ll dist[N][N],work[N][N];
int main(){
    int n,m,k,u,v;
	scanf("%d %d %d",&n,&m,&k);
	for(int i=1;i<=n;i++)for(int j=1;j<=k;j++)scanf("%d %d",&b[i][j],&s[i][j]);
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)for(int l=1;l<=k;l++)if(b[i][l]!=-1&&s[j][l]!=-1)p[i][j]=max(p[i][j],s[j][l]-b[i][l]);
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)dist[i][j]=inf;
	for(int i=1;i<=m;i++)scanf("%d %d",&u,&v),scanf("%lld",&dist[u][v]);
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)for(int l=1;l<=n;l++)dist[j][l]=min(dist[j][l],dist[j][i]+dist[i][l]);
	int r=1e9,l=1,mid,ans=0;
	while(l<=r){
		mid=r+l>>1;
		for(int i=1;i<=n;i++) for(int j=1;j<=n;j++) work[i][j]=(ll)mid*min(dist[i][j],inf/mid)-p[i][j];
		for(int i=1;i<=n;i++) for(int j=1;j<=n;j++) for(int l=1;l<=n;l++) work[j][l]=min(work[j][l],work[j][i]+work[i][l]);
		bool ok=0;for(int i=1;i<=n;i++) ok|=work[i][i]<=0;
		if(ok) ans=mid,l=mid+1;
		else r=mid-1;
	}
	printf("%d",ans);
}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:35:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   35 |   mid=r+l>>1;
      |       ~^~
merchant.cpp: In function 'void usaco(std::string)':
merchant.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp: In function 'int main()':
merchant.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  scanf("%d %d %d",&n,&m,&k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~
merchant.cpp:28:49: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |  for(int i=1;i<=n;i++)for(int j=1;j<=k;j++)scanf("%d %d",&b[i][j],&s[i][j]);
      |                                            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:31:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |  for(int i=1;i<=m;i++)scanf("%d %d",&u,&v),scanf("%lld",&dist[u][v]);
      |                       ~~~~~^~~~~~~~~~~~~~~
merchant.cpp:31:49: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |  for(int i=1;i<=m;i++)scanf("%d %d",&u,&v),scanf("%lld",&dist[u][v]);
      |                                            ~~~~~^~~~~~~~~~~~~~~~~~~~

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