Submission #99898

#	Time	Username	Problem	Language	Result	Execution time	Memory
99898		TadijaSebez	Travelling Merchant (APIO17_merchant)	C++11	100 / 100	104 ms	1528 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#define ll long long
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("%i %i %i",&n,&m,&k);
	for(int i=1;i<=n;i++) for(int j=1;j<=k;j++) scanf("%i %i",&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("%i %i",&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 top=1e9,bot=1,mid,ans=0;
	while(top>=bot)
	{
		mid=top+bot>>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,bot=mid+1;
		else top=mid-1;
	}
	printf("%i\n",ans);
	return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:21:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid=top+bot>>1;
       ~~~^~~~
merchant.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i %i",&n,&m,&k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
merchant.cpp:13:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) for(int j=1;j<=k;j++) scanf("%i %i",&b[i][j],&s[i][j]);
                                              ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:16:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=m;i++) scanf("%i %i",&u,&v),scanf("%lld",&dist[u][v]);
                        ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:16:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]

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