Submission #106198

#	Time	Username	Problem	Language	Result	Execution time	Memory
106198		ekrem	Travelling Merchant (APIO17_merchant)	C++98	100 / 100	525 ms	4088 KiB

merchant

#include <bits/stdc++.h>
#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define orta ((bas+son+1)/2)
#define linf 10000000000000000ll
#define inf 1000000007
#define N 1005
using namespace std;

typedef long long ll;
typedef pair < int , int > ii;

ll n, m, k, mx, bas, son, a[N][N+N], d[105][105], dd[105][105];

bool yap(int x){
	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= n; j++){
			if(i == j){
				dd[i][i] = -linf;
				continue;
			}
			mx = 0;
			for(int y = 1; y <= k+k; y += 2)
				if(a[i][y] != -1 and a[j][y + 1] != -1)
					mx = max(mx, a[j][y + 1] - a[i][y]);
			dd[i][j] = mx - x*d[i][j];
			// cout << i << " " << j << " " << d[i][j] << " " << mx << endl;
 		}
	for(int k = 1; k <= n; k++)
		for(int i = 1; i <= n; i++)
			for(int j = 1; j <= n; j++)
				dd[i][j] = max(dd[i][j], dd[i][k] + dd[k][j] );
	// for(int i = 1; i <= n; i++)
	// 	for(int j = 1; j <= n; j++)
	// 		cout << i << " " << j << " " << dd[i][j] << endl;
	for(int i = 1; i <= n; i++)
		if(dd[i][i] >= 0)
			return true;
	return false;
}

int main() {
	// freopen("in.txt", "r", stdin);
	// freopen("out.txt", "w", stdout);

	scanf("%lld %lld %lld",&n ,&m ,&k);

	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= k+k; j++)
			scanf("%lld",&a[i][j]);


	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= n; j++){
			d[i][j] = inf;
			d[i][i] = 0;
		}

	for(int i = 1; i <= m; i++){
		ll x, y, z;
		scanf("%lld %lld %lld",&x ,&y ,&z);
		d[x][y] = min(d[x][y], z);
	}
	for(int k = 1; k <= n; k++)
		for(int i = 1; i <= n; i++)
			for(int j = 1; j <= n; j++)
				d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
	// yap(2);
	// cout << yap(4) << endl;
	bas = 0, son = 1000000007;
	while(bas < son){
		if(yap(orta))
			bas = orta;
		else
			son = orta - 1;
	}
	printf("%lld\n", bas);
	return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld",&n ,&m ,&k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:52:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lld",&a[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~
merchant.cpp:63:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld %lld",&x ,&y ,&z);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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