Go: package main

/*
連鎖行列積
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"math"
	"os"
	"strconv"
	"strings"
)

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

type mem *[][]int

func main() {
	scanner := makeScanner(1024)
	n := eGetInt(scanner)
	p := make([]int, n+1)
	for i := 0; i < n; i++ {
		rowcol := eGetInts(scanner)
		p[i] = rowcol[0]
		p[i+1] = rowcol[1]
	}
	m := make([][]int, n)
	for i := 0; i < n; i++ {
		m[i] = make([]int, n)
	}
	// 初期値の格納
	for i := 0; i < n; i++ {
		for j := i; j < n; j++ {
			if i == j {
				m[i][j] = 0 //  同じ行列へのコストは当然0
			} else {
				m[i][j] = math.MaxInt64
			}
		}
	}

	// num : 行列の数. num == 1の場合は初期値0を格納ずみ
	for num := 2; num <= n; num++ {
		// s : スタート行列番号
		for s := 0; s+num <= n; s++ {
			// t : 終了行列番号
			t := s + num - 1
			// k : 仕切
			for k := s; k < t; k++ {
				m[s][t] = min(m[s][t], m[s][k]+m[k+1][t]+p[s]*p[k+1]*p[t+1])
			}
		}
	}
	fmt.Println(m[0][n-1])
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}

// func min(a []int) int {
// 	m := a[0]
// 	for _, v := range a {
// 		if v < m {
// 			m = v
// 		}
// 	}
// 	return m
// }

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

C++: #include <bits/stdc++.h>
#define INF 1e7

using namespace std;
typedef long long int ll;

int main()
{
    int n;
    cin >> n;
    vector<int>l(n),r(n);
    for(int i = 0; i < n; i++) cin >> l[i] >> r[i];
    vector<vector<int>>dp(n,vector<int>(n,INF));
    for(int i = 0; i < n; i++) dp[i][i] = 0;
    for(int p = 2; p <= n; p++)
    {
        for(int i = 0; i+p-1 <= n-1; i++)
        {
            int j = i+p-1;
            int S = INF;
            for(int k = i; k < j; k++) S = min(S,dp[i][k]+dp[k+1][j]+l[i]*r[k]*r[j]);
            dp[i][j] = S;
        }
    }
    cout << dp[0][n-1] << endl;
}

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]m[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+1; 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;
        }
        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 <bits/stdc++.h>

using namespace std;

typedef long long int ll;
typedef pair<ll, ll> pll;

#define FOR(i, n, m) for(ll (i)=(m);(i)<(n);++(i))
#define REP(i, n) FOR(i,n,0)
#define OF64 std::setprecision(10)

const ll MOD = 1000000007;
const ll INF = (ll) 1e15;

ll dp[105][105];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N;
    cin >> N;
    vector<pll> A(N);
    REP(i, N) {
        cin >> A[i].first >> A[i].second;
    }

    REP(i, N + 1) {
        REP(j, N + 1) {
            dp[i][j] = INF;
        }
        dp[i][i] = 0;
    }

    FOR(len, N, 1) {
        REP(left, N) {
            if (left + len >= N)
                break;
            REP(i, len) {
                ll mul = dp[left][left + i] + dp[left + i + 1][left + len];
                mul += A[left].first * A[left + i].second * A[left + len].second;
                dp[left][left + len] = std::min(dp[left][left + len], mul);
            }
        }
    }

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

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

int calc(const vector<pair<int, int> >& M, int idx_b, int idx_e,
         vector<vector<int> >& Memo) {
    if (idx_b == idx_e) return 0;
    if (Memo[idx_b][idx_e]) return Memo[idx_b][idx_e];
    int min = 2e9;
    for (int i = idx_b; i < idx_e; i++) {
        int val  = calc(M, idx_b, i, Memo) + calc(M, i + 1, idx_e, Memo)
                   + M[idx_b].first * M[i].second * M[idx_e].second;
        if (val < min) min = val;
    }
    return Memo[idx_b][idx_e] = min;
}

int main(){
    int n;
    cin >> n;
    vector<pair<int, int> > M;

    for (int i = 0; i < n; i++) {
        pair<int, int> input;
        cin >> input.first >> input.second;
        M.push_back(input);
    }
    vector<int> tmp(n, 0);
    vector<vector<int> > Memo(n, tmp);
    cout << calc(M, 0, M.size() - 1, Memo) << endl;

    return 0;
}