Go: package main

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

type Matrix struct {
	r int // num of row
	c int // num of column
}

type Range struct {
	start int // index, inclusive
	end   int // index, inclusive
}

func calcMultiplication(x, y Matrix) (Matrix, int) {
	if x.c != y.r {
		panic("cannnot calculate")
	}
	return Matrix{x.r, y.c}, x.r * y.c * x.c
}

func calcMinMatrixChainMultiplication(matrices []Matrix, r Range, memo map[Range]int) (Matrix, int) {
	if v, ok := memo[r]; ok {
		return Matrix{matrices[0].r, matrices[len(matrices)-1].c}, v
	}
	if len(matrices) == 0 {
		panic("must not be empty")
	} else if len(matrices) == 1 {
		return matrices[0], 0
	} else if len(matrices) == 2 {
		return calcMultiplication(matrices[0], matrices[1])
	}

	var minCount int = math.MaxInt32

	for i := 0; i < len(matrices)-1; i++ {
		formerMatrices := matrices[:i+1]
		latterMatrices := matrices[i+1:]
		matF, countF := calcMinMatrixChainMultiplication(formerMatrices, Range{0, i}, memo)
		matL, countL := calcMinMatrixChainMultiplication(latterMatrices, Range{i + 1, len(matrices) - 1}, memo)
		_, countFL := calcMultiplication(matF, matL)
		count := countF + countL + countFL
		if count < minCount {
			minCount = count
		}
	}
	return Matrix{matrices[0].r, matrices[len(matrices)-1].c}, minCount
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	n, _ := nextInt(sc)
	matrices := make([]Matrix, n)
	for i := 0; i < n; i++ {
		r, _ := nextInt(sc)
		c, _ := nextInt(sc)
		matrices[i] = Matrix{r, c}
	}
	memo := make(map[Range]int)
	_, resultCount := calcMinMatrixChainMultiplication(matrices, Range{0, len(matrices) - 1}, memo)
	fmt.Println(resultCount)
}

func nextInt(sc *bufio.Scanner) (int, error) {
	sc.Scan()
	return strconv.Atoi(sc.Text())
}

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

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

int main() {

    int n;
    cin >> n;
    int p[101] = {0};
    for (int i = 1; i <= n; ++i) {
        cin >> p[i - 1] >> p[i];
    }

    int m[101][101] = {0};
    for (int l = 2; l <= n; ++l) {
        for (int i = 1; i <= n - l + 1; ++i) {
            int j = i + l - 1;
            m[i][j] = (1 << 21);
            for (int k = i; k <= j - 1; ++k) {
                m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]);
            }
        }
    }

    cout << m[1][n] << endl;
    return 0;
}

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

int main()
{
	int n, i, j, l,k;
	int A[101];
	int q[101][101];
	cin >> n;
	for (i = 1; i < n+1; i++) {
		cin >> A[i - 1] >> A[i];
	}
	for (i = 0; i < n + 1; i++) q[i][i] = 0;

	for (l = 2; l < n + 1; l++) {
		for (i = 1; i < n - l + 2; i++) {
			j = i + l - 1;
			q[i][j] = (1<<21);
			for (k = i; k < j; k++) {
				q[i][j] = min(q[i][j], q[i][k] + q[k + 1][j] + A[i - 1] * A[k] * A[j]);
			}
		}
	}
	cout << q[1][n] << endl;

}

C++: #include <algorithm>
#include <cstdio>

using namespace std;

#define MAX_N (105)
#define MAX_R (105)
#define MAX_C (105)
#define INF (MAX_N * MAX_R * MAX_C)

int r[MAX_N];
int c[MAX_N];
int dp[MAX_N][MAX_N];
int n;

int main()
{
    scanf("%d", &n);
    for ( int i = 0; i < n; i++ ) {
	scanf("%d %d", &r[i], &c[i]);
    }
    
    for ( int l = 1; l <= n; l++ ) {
	for ( int h = 0; h <= n - l; h++ ) {
	    if ( l == 1 ) dp[h][h+l-1] = 0;
	    else {
		// (h~m), (m+1~h+l-1)
		int min_cost = INF;
		for ( int m = h; m < h + l - 1; m++ ) {
		    int cost = dp[h][m] + dp[m+1][h+l-1] + r[h] * c[m] * c[h+l-1];
		    min_cost = min( min_cost, cost );
		}
		dp[h][h+l-1] = min_cost;
	    }
	}
    }
    printf("%d\n", dp[0][n-1]);
    return 0;
}

C++: #include <iostream>
#include <cmath>
#include <iomanip>
#include <limits>
#include <string>
#include <vector>
#include <algorithm>
#include <stack>
#include <queue>
#include <map>
#include <list>
#include <cctype>
using namespace std;
typedef long long ll;
#define rep(i,n) for(ll i=0;i<(n);i++)
ll INF=1000000007;

int main(){
    ll dp[110][110];
    ll n;
    cin >> n;
    ll r[n],c[n];
    rep(i,n) cin >> r[i] >> c[i];
    rep(i,n) dp[i][i]=0;
    for(ll m=1;m<=n-1;m++){
        rep(i,n-m){
            dp[i][i+m]=INF;
            for(ll k=i;k<=i+m-1;k++){
                if(dp[i][i+m]>dp[i][k]+dp[k+1][i+m]+r[i]*c[k]*c[i+m]){
                    dp[i][i+m] = dp[i][k]+dp[k+1][i+m]+r[i]*c[k]*c[i+m];
                }
            }
        }
    }
    cout << dp[0][n-1] << endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define INFTY powl(2,60)

vector<vector<long long>> m(101,vector<long long>(101));
vector<int> p(101);

long long matrixChainMultiplication(int n){
    for(int i=1;i<n+1;i++){
        m[i][i]=0;
    }
    for(int l=1;l<n;l++){
        for(int i=1;i<n-l+1;i++){
            int j=i+l;
            m[i][j]=INFTY;
            for(int k=i;k<j;k++){
                m[i][j]=min(m[i][j],m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j]);
            }
        }
    }
    return m[1][n];
}

int main(){
    int n;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>p[i]>>p[i+1];
    }
    cout<<matrixChainMultiplication(n)<<endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define all(n) begin(n),end(n)


const int INF = 1e9;
int main() {
    int n;
    cin >> n;
    vector<int> p(n+1);
    int dp[105][105];
    rep(i,n) cin >> p[i] >> p[i+1];
    rep(i,n){
        rep(j,n) dp[i][j] = INF;
    }
    int mn;
    for(int i = 0; i < n; ++i) dp[i][i] = 0;
    for(int l = 2; l <= n; ++l){
        for(int i = 1; i + l -1 <= n; ++i){
            int j = i + l -1;
            for(int k = i; k < j; ++k){
                if(k==i) mn = dp[i][k] + dp[k+1][j] + p[i-1] * p[k] * p[j];
                else mn = min(mn, dp[i][k] + dp[k+1][j] + p[i-1] * p[k] * p[j]);
            }
            dp[i][j] = mn;
        }
    }
    cout << dp[1][n] << endl;
    return 0;
}

C++: 
#include <stdio.h>
#include <stdlib.h>

int *r, *c;

int main() {
  int n, i;

  scanf("%d", &n);

  r = (int *) malloc(sizeof(int)*n);
  c = (int *) malloc(sizeof(int)*n);

  for(i = 0; i < n; i++) {
    scanf("%d %d", &r[i], &c[i]);
  }

  printf("%d\n", cost(0, n-1));

  free(r);
  free(c);

  return 0;
}

int cost(int a, int b) {
  if (a == b) {
    return 0;
  } else {
    int total, minTotal = 1000000, m;

    for(m = a; m < b; m++) {
      total = cost(a, m) + cost(m+1, b) + r[a]*c[m]*c[b];
      if (total < minTotal)
        minTotal = total;
    }

    return minTotal;
  }
}

C++: #include<iostream>
#include<climits>
using namespace std;
int main(){
  int n,data[101]; cin>>n;
  for(int i=0;i<n;++i) cin>>data[i]>>data[i+1];
  int dp[100][100]={};
  for(int num=2;num<=n;++num){
    for(int first=0;first<=n-num;++first){
      int end=first+num-1;
      dp[first][end]=INT_MAX/2;
      for(int i=first;i<=end;++i){
	if(dp[first][end]>dp[first][i]+dp[i+1][end]+data[first]*data[i+1]*data[end+1])
	  dp[first][end]=dp[first][i]+dp[i+1][end]+data[first]*data[i+1]*data[end+1];
      }
    }
  }
  cout<<dp[0][n-1]<<endl;
  return 0;
}

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

static const int N = 100;

int main() {
	int n, p[N + 1], m[N + 1][N + 1];
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> p[i - 1] >> p[i];
	}

	for (int i = 1; i <= n; i++)m[i][i] = 0;
	for (int l = 2; l <= n; l++) {
		for(int i=1;i<=n-l+1;i++){
		int j = i + l - 1;
		m[i][j] = (1 << 21);
		for (int k = i; k <= j - 1; k++) {
			m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]);
			}
		}
	}

	cout <<  m[1][n] << endl;

	return 0;
}