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 (r Range) length() int {
	return r.end - r.start + 1
}

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[r.start].r, matrices[r.end].c}, v
	}
	if r.length() == 0 {
		panic("must not be empty")
	} else if r.length() == 1 {
		return matrices[r.start], 0
	}

	var minCount int = math.MaxInt32

	for i := 0; i < r.length()-1; i++ {
		formerRange := Range{r.start, r.start + i}
		latterRange := Range{r.start + i + 1, r.end}
		matF, countF := calcMinMatrixChainMultiplication(matrices, formerRange, memo)
		matL, countL := calcMinMatrixChainMultiplication(matrices, latterRange, memo)
		_, countFL := calcMultiplication(matF, matL)
		count := countF + countL + countFL
		if count < minCount {
			minCount = count
		}
	}
	memo[r] = minCount
	return Matrix{matrices[r.start].r, matrices[r.end].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 <bits/stdc++.h>
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;
}

C++: #include <cassert>
// #include <algorithm>
#include <iostream>
#include <vector>
#include <climits>

struct TSize
{
    int r;
    int c;
    TSize() : r(0), c(0) {}
    TSize(int Ar, int Ac)
     : r(Ar), c(Ac)
    {}
};

class TMcmSolver
{
    typedef std::vector<std::vector<int> > TMatrix;
    TMatrix FMemo;
    const std::vector<TSize>& FChain;

    static int Count(const TSize& Left, const TSize& Right)
    {
        return Left.r * Right.c * Left.c;
    }
    int Solve(int s, int l)
    {
        assert(s <= l);
        if(s == l) return 0;
        if(FMemo[s][l] != 0) return FMemo[s][l];
        if(s + 1 == l){
            FMemo[s][l] = Count(FChain[s], FChain[l]);
        }else{
            int min = INT_MAX;
            for(int i = s; i < l; ++i){
                int c = Solve(s, i) + Count(TSize(FChain[s].r, FChain[i].c), TSize(FChain[i+1].r, FChain[l].c)) + Solve(i+1, l);
                min = std::min(min, c);
            }
            FMemo[s][l] = min;
        }
        // std::cout << "Solve! [" << s << "], [" << l << "]" << std::endl; 
        return FMemo[s][l];
    }
public:
    TMcmSolver(const std::vector<TSize>& Chain)
     : FChain(Chain)
    {
        FMemo.resize(Chain.size());
        for(std::size_t i = 0; i < FMemo.size(); ++i){
            FMemo[i].resize(Chain.size(), 0);
        }
    }
    int Answer()
    {
        return Solve(0, FMemo.size()-1);
    }
    void Print()const
    {
        for(std::size_t s = 0; s < FMemo.size(); ++s){
            for(std::size_t l = 0; l < FMemo[0].size(); ++l){
                std::cout << FMemo[s][l] << '\t';
            }
            std::cout << '\n';
        }
    }
};

int main()
{
    int n;
    std::cin >> n;
    if(n == 1){
        std::cout << 0 << std::endl;
        return 0;
    }
    std::vector<TSize> Chain(n);
    for(int i = 0; i < n; ++i){
        std::cin >> Chain[i].r >> Chain[i].c;
    }
    TMcmSolver Solver(Chain);
    
    std::cout << Solver.Answer() << std::endl;
    // Solver.Print();
    return 0;
}

C++: #include <cstdio>
#include <cstring>
#include <cstdlib>
#include <vector>
using namespace std;


#define min(a, b) ((a) < (b) ? (a) : (b))

int N;
const int MAX_N = 110;
const int INF = 0x3fffffff;
int A[MAX_N];
int B[MAX_N];
int dp[MAX_N][MAX_N];

void init() {
    scanf("%d", &N);
    for(int i = 0; i < N; ++i)
        scanf("%d%d",&A[i], &B[i]);
    for(int i = 0 ;i < N; ++i)
        for(int j = 0; j < N; ++j)
            dp[i][j] = INF;
    for(int i = 0; i < N; ++i)
        dp[i][i] = 0;
}

int solve() {
    for(int k = 1; k < N; ++k) {
        for(int i = 0; i < N - k; ++i) {
            for(int j = i; j < i + k; ++j) {
                printf("i = %d j = %d k = %d\n", i, j, k);
                int sz = A[i] * B[j] * B[i + k];
                dp[i][i + k] = min(dp[i][i + k],dp[i][j] + dp[j+1][i + k] + sz);
            }
        }
    }
    // for(int i = 0; i < N; ++i) {                                                                                                                                              
    //  for(int j = 0; j < N; ++j)                                                                                                                                               
    //      printf("%d ", dp[i][j]);                                                                                                                                             
    //  printf("\n");                                                                                                                                                            
    // }                                                                                                                                                                         
    return dp[0][N - 1];
}

int main() {
    init();
    printf("%d\n", solve());
    return 0;
}

C++: #include <bits/stdc++.h>
using ll = long long;
using namespace std;
#define rep(i,n) for(int i=0, i##_len=(int)(n); i<i##_len; i++)
#define reps(i,n) for(int i=1 , i##_len=(int)(n);i<=i##_len;i++)
#define rrep(i,n) for(int i=((int)(n)-1);i>=0;i--)
#define rreps(i,n) for(int i=((int)(n));i>0;i--)
#define all(x) (x).begin(), (x).end()
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define solve(a) ((a)?"Yes":"No")
typedef vector<long long> V;
typedef vector<V> VV;
typedef pair<long long , long long> P;
typedef vector<P> VP;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1;} return 0;}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1;} return 0;}
const long long INFLL = 1LL<<62;
const int INF = 1<<30;
const double PI=acos(-1);
ll func(int l,int r,VV &dp,vector<pair<ll,ll>>&data){
	if(dp[l][r]==-1){
		dp[l][r]=INFLL;
		for(int med=l;med<r;med++){
			chmin(dp[l][r],func(l,med,dp,data)+func(med+1,r,dp,data)+data[l].F*data[med].S*data[r].S);
		}
	}
	return dp[l][r];
}
int main(){
	int n;
	
	cin >>n;
	vector<pair<ll,ll>>data(n,mp(1,1));
	rep(i,n){
		cin>>data[i].F>>data[i].S;
	}
	VV dp(n,V(n,-1));
	rep(i,n){
		dp[i][i]=0LL;
	}

	cout<<func(0,n-1,dp,data)<<endl;
}