Submission #533978

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Source Code Expand

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using System.Numerics;
using System.Globalization;

namespace Solver
{
    class Program
    {
        const int M = 1000000007;
        const double eps = 1e-9;
        static void Main()
        {
            var sw = new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            var sc = new Scan();
            int t = sc.Int;
            for (int i = 0; i < t; i++)
            {
                int n = sc.Int;
                var a = new int[n][];
                for (int j = 0; j < n; j++)
                {
                    a[j] = sc.IntArr;
                    if (a[j][j] != 0)
                    {
                        sw.WriteLine("NO");
                        goto A;
                    }
                }
                var b = WarshallFloyd(a);
                for (int j = 0; j < n; j++)
                {
                    for (int k = 0; k < n; k++)
                    {
                        if (a[j][k] != b[j][k] && a[j][k] != -1)
                        {
                            sw.WriteLine("NO");
                            goto A;
                        }
                    }
                }
                sw.WriteLine("YES");

            A:
                continue;
            }
            sw.Flush();
        }
        static int[][] WarshallFloyd(int[][] g)
        {
            var d = Copy(g);
            int n = d.Length;
            for (int i = 0; i < n; ++i)
                for (int j = 0; j < n; ++j)
                    for (int k = 0; k < n; ++k)
                        d[j][k] = Math.Min(d[j][k], d[j][i] + d[i][k]);

            return d;
        }
        static int[][] Copy(int[][] g)
        {
            var ret = new int[g.Length][];
            for (int i = 0; i < g.Length; ++i)
            {
                ret[i] = new int[g[i].Length];
                for (int j = 0; j < g[i].Length; ++j)
                {
                    if (g[i][j] == -1)
                        ret[i][j] = 1000000007;
                    else
                        ret[i][j] = g[i][j];
                }
            }
            return ret;
        }
    }
    class Scan
    {
        public int Int { get { return int.Parse(Console.ReadLine().Trim()); } }
        public long Long { get { return long.Parse(Console.ReadLine().Trim()); } }
        public string Str { get { return Console.ReadLine().Trim(); } }
        public int[] IntArr { get { return Console.ReadLine().Trim().Split().Select(int.Parse).ToArray(); } }
        public int[] IntArrWithSep(char sep) { return Console.ReadLine().Trim().Split(sep).Select(int.Parse).ToArray(); }
        public long[] LongArr { get { return Console.ReadLine().Trim().Split().Select(long.Parse).ToArray(); } }
        public double[] DoubleArr { get { return Console.ReadLine().Split().Select(double.Parse).ToArray(); } }
        public string[] StrArr { get { return Console.ReadLine().Trim().Split(); } }
        public List<int> IntList { get { return Console.ReadLine().Trim().Split().Select(int.Parse).ToList(); } }
        public List<long> LongList { get { return Console.ReadLine().Trim().Split().Select(long.Parse).ToList(); } }
        public void Multi(out int a, out int b) { var arr = IntArr; a = arr[0]; b = arr[1]; }
        public void Multi(out int a, out int b, out int c) { var arr = IntArr; a = arr[0]; b = arr[1]; c = arr[2]; }
        public void Multi(out int a, out int b, out int c, out int d) { var arr = IntArr; a = arr[0]; b = arr[1]; c = arr[2]; d = arr[3]; }
        public void Multi(out int a, out string b) { var arr = StrArr; a = int.Parse(arr[0]); b = arr[1]; }
        public void Multi(out int a, out int b, out string c) { var arr = StrArr; a = int.Parse(arr[0]); b = int.Parse(arr[1]); c = arr[2]; }
        public void Multi(out int a, out char b) { var arr = StrArr; a = int.Parse(arr[0]); b = arr[1][0]; }
        public void Multi(out char a, out int b) { var arr = StrArr; a = arr[0][0]; b = int.Parse(arr[1]); }
        public void Multi(out long a, out long b) { var arr = LongArr; a = arr[0]; b = arr[1]; }
        public void Multi(out long a, out int b) { var arr = LongArr; a = arr[0]; b = (int)arr[1]; }
        public void Multi(out string a, out string b) { var arr = StrArr; a = arr[0]; b = arr[1]; }
    }
    class mymath
    {
        int M;
        const double eps = 1e-9;
        public mymath(int M) { this.M = M; }
        public long pow(long a, long b)
        {
            if (b == 0) return 1;
            if (b == 1) return a % M;

            long t = pow(a, b / 2);

            if ((b & 1) == 0) return t * t % M;
            else return t * t % M * a % M;
        }
        public long gcd(long a, long b)
        {
            while (b != 0)
            {
                var t = a % b;
                a = b;
                b = t;
            }
            return a;
        }
        public long lcm(int a, int b) { return (a * b) / gcd(a, b); }
    }
}

Submission Info

Judge Result