No tags yet

No tag edit access

The problem statement has recently been changed. View the changes.

×
time limit per test: 0.5 sec.

memory limit per test: 65536 KB

memory limit per test: 65536 KB

input: standard

output: standard

output: standard

The terrorist group leaded by a well known international terrorist Ben Bladen is buliding a nuclear reactor to produce plutonium for the nuclear bomb they are planning to create. Being the wicked computer genius of this group, you are responsible for developing the cooling system for the reactor.

The cooling system of the reactor consists of the number of pipes that special cooling liquid flows by. Pipes are connected at special points, called nodes, each pipe has the starting node and the end point. The liquid must flow by the pipe from its start point to its end point and not in the opposite direction.

Let the nodes be numbered from 1 to N. The cooling system must be designed so that the liquid is circulating by the pipes and the amount of the liquid coming to each node (in the unit of time) is equal to the amount of liquid leaving the node. That is, if we designate the amount of liquid going by the pipe from i-th node to j-th as f_{ij}, (put f_{ij} = 0 if there is no pipe from node i to node j), for each i the following condition must hold:

sum(j=1..N, f_{ij}) = sum(j=1..N, f_{ji})

Each pipe has some finite capacity, therefore for each i and j connected by the pipe must be f_{ij} ≤ c_{ij} where c_{ij} is the capacity of the pipe. To provide sufficient cooling, the amount of the liquid flowing by the pipe going from i-th to j-th nodes must be at least l_{ij}, thus it must be f_{ij} ≥ l_{ij}.

Given c_{ij} and l_{ij} for all pipes, find the amount f_{ij}, satisfying the conditions specified above.

The cooling system of the reactor consists of the number of pipes that special cooling liquid flows by. Pipes are connected at special points, called nodes, each pipe has the starting node and the end point. The liquid must flow by the pipe from its start point to its end point and not in the opposite direction.

Let the nodes be numbered from 1 to N. The cooling system must be designed so that the liquid is circulating by the pipes and the amount of the liquid coming to each node (in the unit of time) is equal to the amount of liquid leaving the node. That is, if we designate the amount of liquid going by the pipe from i-th node to j-th as f

sum(j=1..N, f

Each pipe has some finite capacity, therefore for each i and j connected by the pipe must be f

Given c

The first line of the input file contains the number N (1 ≤ N ≤ 200) - the number of nodes and and M — the number of pipes. The following M lines contain four integer number each - i, j, l

On the first line of the output file print YES if there is the way to carry out reactor cooling and NO if there is none. In the first case M integers must follow, k-th number being the amount of liquid flowing by the k-th pipe. Pipes are numbered as they are given in the input file.

Input

Test #1

4 6

1 2 1 2

2 3 1 2

3 4 1 2

4 1 1 2

1 3 1 2

4 2 1 2

Test #2

4 6

1 2 1 3

2 3 1 3

3 4 1 3

4 1 1 3

1 3 1 3

4 2 1 3

4 6

1 2 1 2

2 3 1 2

3 4 1 2

4 1 1 2

1 3 1 2

4 2 1 2

Test #2

4 6

1 2 1 3

2 3 1 3

3 4 1 3

4 1 1 3

1 3 1 3

4 2 1 3

Output

Test #1

NO

Test #2

YES

1

2

3

2

1

1

NO

Test #2

YES

1

2

3

2

1

1

Author: | Andrew Stankevich |

Resource: | Petrozavodsk Winter Trainings 2003 |

Date: | 2003-02-06 |

Codeforces (c) Copyright 2010-2021 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Mar/06/2021 04:25:07 (i2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|