Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	p := make([]int, N+1)
	dp := make([][]int, N+1)
	for i, _ := range dp {
		dp[i] = make([]int, N+1)
	}
	for i := 0; i < N; i++ {
		p[i] = sc.nextInt()
		p[i+1] = sc.nextInt()
	}
	for i := 1; i <= N; i++ {
		dp[i][i] = 0
	}
	for l := 2; l <= N; l++ {
		for i := 1; i <= N-l+1; i++ {
			j := i + l - 1
			dp[i][j] = 1 << 60
			for k := i; k <= j-1; k++ {
				dp[i][j] = min(dp[i][j], dp[i][k]+dp[k+1][j]+p[i-1]*p[k]*p[j])
			}
		}
	}

	fmt.Fprintln(wtr, dp[1][N])
	wtr.Flush()
}

C++: #include <iostream>
using namespace std;

template<typename T, typename U> void dmin(T &x, U y) { if(x > y) x = y; }

const int MAX_N = 100;
const int INF = 1001001001;

int main() {
  int n, r, c;
  int rc[MAX_N][2];
  cin >> n;
  for (int i=0; i<n; i++) {
    cin >> r >> c;
    rc[i][0] = r; rc[i][1] = c;
  }

  int dp[MAX_N][MAX_N];
  for (int i=0; i<n; i++) {
    for (int j=0; j<n; j++) {
      dp[i][j] = INF;
    }
    dp[i][i] = 0;
  }

  for (int l=2; l<=n; l++) {
    for (int i=0; i+l-1<n; i++) {
      for (int j=1; j<l; j++) {
        dmin(dp[i][i+l-1], dp[i][i+j-1] + rc[i][0]*rc[i+j-1][1]*rc[i+l-1][1] + dp[i+j][i+l-1]);
      }
    }
  }

  cout << dp[0][n-1] << endl;
  return 0;
}

C++: #include <cstdio>
#include <algorithm>
using namespace std;
const int M = 128;
const int inf = (1<<25);

int d[M][M], p[M+2];
int path[M][M];

int main()
{
	int n;
	scanf("%d", &n);
	for (int i = 0; i < n; ++i)
		scanf("%d %d", p+i, p+i+1);
	
	for (int i = 1; i <= n; ++i) d[i][i] = 0;
	for (int ln = 2; ln <= n; ++ln)	// 枚举矩阵链的长度 
	{
		int m = n - ln + 1; 		// 剩余矩阵的长度 
		
		for (int i = 1; i <= m; ++i)// len-ln = j-i+1 j = ln+i-1
		{
			int j = ln + i - 1;
			d[i][j] = inf;			
			for (int k = i; k < j; ++k)
				d[i][j] = min(d[i][j], d[i][k] + d[k+1][j] + p[i-1] * p[k] * p[j]);
		}		
	}
	
	printf("%d\n", d[1][n]);
	return 0;
}

C++: #include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<climits>
#include<iostream>
#include<sstream>
#include<utility>
#include<map>
#include<vector>
#include<queue>
#include<algorithm>
#include<set>
#include<stack>
using namespace std;
typedef long long ll;
typedef pair<int,int>P;
int N;
int r[105],c[105];
ll dp[105][105]={0};

void dbg()
{
	for(int i=0;i<N;i++,puts(""))
		for(int j=0;j<N;j++)
			printf("%7d ",dp[i][j]);
}

int main()
{
	scanf("%d",&N);
	for(int i=0;i<N;i++)
		scanf("%d%d",&r[i],&c[i]);
	for(int i=0;i<N;i++)dp[i][i]=0;
	for(int l=1;l<N;l++)
		for(int i=0;i<N-l;i++)
		{
			int j=i+l;
			dp[i][j]=1e15;
			for(int k=i;k<j;k++)
			{
				//printf("%d %d %d %d\n",i,j,i+l,k);
				dp[i][j]=min(dp[i][j],dp[i][k]+dp[k+1][j]+r[i]*c[k]*c[j]);
			}
		}
	//dbg();
	printf("%lld\n",dp[0][N-1]);
	return 0;
}

C++: #include<iostream>
using namespace std;
struct mat
{
	int w;
	int h;
};
typedef struct mat mat_t;
long long min(long long a,long long b);

int n;
mat_t a[101];
long long dp[101][101] ;

int main(){
	cin >> n;
	for(int i=0;i<n;i++){
		cin >> a[i].h >> a[i].w;
	}
	for(int x = 0;x<n;x++){
		for(int y =0;y<n;y++){
			dp[x][y] = 2000000;
			if(x == y) dp[x][y] = 0;
		}
	}
	int i = 0;
	int j = 1;
	for(int l = 1;l<n;l++){
		i = 0;
		for(j=l;j<n;j++){
			for(int k = i;i <= k && k < j;k++){
				dp[i][j] = min(dp[i][j],dp[i][k] + dp[k+1][j] + a[i].h *a[k].w * a[j].w);
			}
			i++;
		}
	}
	cout << dp[0][n-1] << endl;
}

long long min(long long a,long long b) {
	return a<b? a:b;
}