// BEGIN CUT HERE// END CUT HERE#line 5 "ChocolateDividingHard.cpp"#include <cstdlib>#include <cctype>#include <cstring>#include <cstdio>#include <cmath>#include <algorithm>#include <vector>#include <string>#include <iostream>#include <sstream>#include <map>#include <set>#include <queue>#include <stack>#include <fstream>#include <numeric>#include <iomanip>#include <bitset>#include <list>#include <stdexcept>#include <functional>#include <utility>#include <ctime>using namespace std;#define PB push_back#define MP make_pairtypedef vector<int> VI;typedef vector<string> VS;typedef vector<double> VD;typedef long long LL;typedef pair<int,int> PII;const int maxn = 80;int nsum[maxn], num[4][maxn];int val[maxn][maxn], n, m, csum[maxn][maxn];bool ok(int val) {    int pcnt = 0, p0 = 0, p1 = 0, p2 = 0, p3 = 0;    for(int i = 1; i <= m; i++) {        p0 += num[0][i]; p1 += num[1][i]; p2 += num[2][i]; p3 += num[3][i];        if(p0 >= val && p1 >= val && p2 >= val && p3 >= val) {            pcnt++; p0 = p1 = p2 = p3 = 0;        }        if(pcnt >= 4) return true;    }    return pcnt >= 4;}int calc(int pos1, int pos2, int pos3) {    for(int i = 1; i <= m; i++) {        num[0][i] = csum[pos1][i];        num[1][i] = csum[pos2][i] - csum[pos1][i];        num[2][i] = csum[pos3][i] - csum[pos2][i];        num[3][i] = csum[n][i] - csum[pos3][i];    }    int l = 0, r = 75 * 75 * 9 + 100, ret;    while(l <= r) {        int mid = (l + r) >> 1;        if(ok(mid)) {            ret = mid; l = mid + 1;        }        else r = mid - 1;    }    return ret;}int solve() {    int ret = 0;    for(int i = 1; i <= n; i++) {        for(int j = i + 1; j <= n; j++) {            for(int k = j + 1; k <= n; k++) {                ret = max(ret, calc(i, j, k));            }        }    }    return ret;}class ChocolateDividingHard{    public:        int findBest(vector <string> chocolate)        {            n = chocolate.size();            m = chocolate[0].size();            for(int i = 1; i <= n; i++) {                for(int j = 1; j <= m; j++) {                    val[i][j] = chocolate[i - 1][j - 1] - ‘0‘;                    csum[i][j] = csum[i - 1][j] + val[i][j];                }            }            return solve();        }        // BEGIN CUT HERE    public:        void run_test(int Case) { if ((Case == -1) || (Case == 0)) test_case_0(); if ((Case == -1) || (Case == 1)) test_case_1(); if ((Case == -1) || (Case == 2)) test_case_2(); if ((Case == -1) || (Case == 3)) test_case_3(); }    private:        template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << ‘\"‘ << *iter << "\","; os << " }"; return os.str(); }        void verify_case(int Case, const int &Expected, const int &Received) { cerr << "Test Case #" << Case << "..."; if (Expected == Received) cerr << "PASSED" << endl; else { cerr << "FAILED" << endl; cerr << "\tExpected: \"" << Expected << ‘\"‘ << endl; cerr << "\tReceived: \"" << Received << ‘\"‘ << endl; } }        void test_case_0() { string Arr0[] = {            "95998",            "21945",            "23451",            "99798",            "74083"        }; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 3; verify_case(0, Arg1, findBest(Arg0)); }        void test_case_1() { string Arr0[] = {            "12942",            "23456",            "99798",            "98998",            "67675"        }; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 5; verify_case(1, Arg1, findBest(Arg0)); }        void test_case_2() { string Arr0[] = {            "129420",            "234560",            "997980",            "989980",            "676760"        }; vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 6; verify_case(2, Arg1, findBest(Arg0)); }        void test_case_3() { string Arr0[] = {"987055360916669852598058396375563481229411099995156272011861439988222463", "765684319037260548602622644880358846578673519776658830295695853657506574", "827026882685707468963429171048633355035213903841967401541765520055750294", "514011327279425591275391078390771194237174318088437966083115184423068706", "359450413111939543073417924816671518750081376523840104908509168439216434", "774426703733345195321187318971658092862158592004836177800817292091509715", "586018414221933914736965317201989582625268361874448066899519617885269886"};            vector <string> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[0]))); int Arg1 = 87; verify_case(3, Arg1, findBest(Arg0)); }        // END CUT HERE};// BEGIN CUT HEREint main(){    ChocolateDividingHard ___test;    ___test.run_test(-1);    return 0;}// END CUT HERE