#include <bits/stdc++.h>
#include <random>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef double ld;
//#define ll __int128
//#define int ll
//#define int ll
//#define char ll
typedef vector<char> vc;
typedef vector<vc> vvc;
typedef vector<vvc> vvvc;
typedef pair<int, int> pii;
typedef pair<pii, pii> piii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vpi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;

#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < int(n); ++i)
#define SZ(a) ((int)((a).size()))
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>
#define watch(x) cerr << (#x) << " = " << (x) << endl;

#ifdef MAX_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif

const double PI = 2 * acos(0.0);
#define rand shittttty_shit
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";


template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1>
inline istream & operator >> (istream &in, pair<T0, T1> &a) {
    return in >> a.first >> a.second;
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}


void smain();



signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
#ifdef MAX_HOME
    freopen("input.txt", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(4) << fixed;
    smain();
#ifdef MAX_HOME
    cout << "\n\n\n\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
    return 0;
}

const int N = 2020;

bool mat[N][N];
bool used[N][N];
int px[N][N], py[N][N];
int n, m;


vi di = {0, 0, -1, 1};
vi dj = {-1, 1, 0, 0};

int pref[N][N];

void dfs(int x, int y, pii par = {-1, -1}) {
    px[x][y] = par.first, py[x][y] = par.second;
//    cerr << "parent[" << x << "][" << y << "] = " << par << endl;
    if (par.first == -1) {
        pref[x][y]++;
        px[x][y] = x, py[x][y] = y;
    }
    used[x][y] = true;
    fori (dir, di.size()) {
        int xx = x + di[dir];
        int yy = y + dj[dir];
        if (!used[xx][yy] && mat[xx][yy]) {
            dfs(xx, yy, {x, y});
        }
    }
}


int prefxl[N][N], prefxr[N][N];
int prefyl[N][N], prefyr[N][N];


void smain() {



    int n, m, q;
    cin >> n >> m >> q;
    for (int i = 1; i <= n; ++i) {
        string s;
        cin >> s;
        for (int j = 1; j <= m; ++j){
            mat[i][j] = s[j - 1] == '1';
        }
    }


    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            if (!used[i][j] && mat[i][j]) {
                dfs(i, j);
            }
        }
    }

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
//            cerr << pref[i][j] << ' ';
            pref[i][j] += pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1];
            prefxl[i][j] += mat[i][j] && px[i][j] < i;
            prefxr[i][j] += mat[i][j] && px[i][j] > i;
            prefyl[i][j] += mat[i][j] && py[i][j] < j;
            prefyr[i][j] += mat[i][j] && py[i][j] > j;
            prefxl[i][j] += prefxl[i][j - 1];
            prefxr[i][j] += prefxr[i][j - 1];
            prefyl[i][j] += prefyl[i - 1][j];
            prefyr[i][j] += prefyr[i - 1][j];
        }
//        cerr << '\n';
    }


    while (q--) {
        int xl, xr, yl, yr;
        cin >> xl >> yl >> xr >> yr;
        int ans = pref[xr][yr] - pref[xl - 1][yr] - pref[xr][yl - 1] + pref[xl - 1][yl - 1];
        ans += prefxl[xl][yr] - prefxl[xl][yl - 1];
        ans += prefxr[xr][yr] - prefxr[xr][yl - 1];
        ans += prefyl[xr][yl] - prefyl[xl - 1][yl];
        ans += prefyr[xr][yr] - prefyr[xl - 1][yr];
        cout << ans << '\n';
    }

}



Measured memory_bytes: 122240