#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif
#pragma GCC optimize("O3")

#include<bits/stdc++.h>

using namespace std;

#define pb push_back

typedef long long ll;
typedef double ld;
int n, m;
const int maxN = 205;
int cnt_other[4 * maxN];
int info[4 * maxN][maxN][2];
int tp[maxN][maxN];
int q;
int par[4 * maxN];
int rnk[4 * maxN];

int get(int x) {
    if (x == par[x]) return x;
    return par[x] = get(par[x]);
}

void unite(int a, int b) {
    a = get(a);
    b = get(b);
    if (a == b) return;
    if (rnk[b] < rnk[a]) swap(a, b);
    if (rnk[b] == rnk[a]) rnk[b]++;
    par[a] = b;
}

int MP[4 * maxN];
int SZ[4 * maxN];
int EDGE[2 * maxN][2 * maxN];
int CNT[4 * maxN];
int id[4 * maxN];
int Q[4 * maxN];
int ITER = 0;
int inter[4 * maxN];

void merge(int v, int l, int mid, int r) {
    cnt_other[v] = cnt_other[2 * v] + cnt_other[2 * v + 1];
    int SZ1 = SZ[2 * v];
    int SZ2 = SZ[2 * v + 1];
    for (int u = 0; u < SZ1; u++) {
        CNT[2 * u] = 0;
        id[2 * u] = -1;
    }
    for (int u = 0; u < SZ2; u++) {
        CNT[2 * u + 1] = 0;
        id[2 * u + 1] = -1;
    }
    for (int x = 1; x <= m; x++) {
        if (tp[mid][x] == tp[mid + 1][x]) {
            int P = info[2 * v][x][1] * 2;
            int Q = info[2 * v + 1][x][0] * 2 + 1;
            EDGE[P][CNT[P]] = Q;
            EDGE[Q][CNT[Q]] = P;
            CNT[P]++;
            CNT[Q]++;
        }
    }
    int CMP = 0;
    for (int x = 1; x <= m; x++) {
        if (id[info[2 * v][x][1] * 2] == -1) {
            int u = info[2 * v][x][1];
            ++CMP;
            int topQ = 0;
            Q[topQ++] = 2 * u;
            id[2 * u] = 2 * u;
            for (int z = 0; z < topQ; z++) {
                int vert = Q[z];
                for (int p = 0; p < CNT[vert]; p++) {
                    if (id[EDGE[vert][p]] == -1) {
                        id[EDGE[vert][p]] = 2 * u;
                        Q[topQ++] = EDGE[vert][p];
                    }
                }
            }
        }
    }
    ITER++;
    for (int x = 1; x <= m; x++) {
        if (id[info[2 * v][x][0] * 2] == -1) {
            ++CMP;
            id[info[2 * v][x][0] * 2] = info[2 * v][x][0] * 2;
        }
        inter[id[info[2 * v][x][0] * 2]] = ITER;
        if (id[info[2 * v + 1][x][1] * 2 + 1] == -1) {
            ++CMP;
            id[info[2 * v + 1][x][1] * 2 + 1] = info[2 * v + 1][x][1] * 2 + 1;
        }
        inter[id[info[2 * v + 1][x][1] * 2 + 1]] = ITER;
    }
    int sz = 0;
    for (int j = 0; j < 2 * SZ1; j += 2) {
        if (inter[j] == ITER) {
            CMP--;
            MP[j] = sz;
            sz++;
        }
    }
    for (int j = 1; j < 2 * SZ2; j += 2) {
        if (inter[j] == ITER) {
            CMP--;
            MP[j] = sz;
            sz++;
        }
    }
    cnt_other[v] += CMP;
    for (int x = 1; x <= m; x++) {
        info[v][x][0] = MP[id[info[2 * v][x][0] * 2]];
        info[v][x][1] = MP[id[info[2 * v + 1][x][1] * 2 + 1]];
    }
    SZ[v] = sz;
}

void build(int v, int tl, int tr) {
    if (tl == tr) {
        cnt_other[v] = 0;
        int sz = 0;
        for (int j = 1; j <= m; j++) {
            if (j == 1 || tp[tl][j] != tp[tl][j - 1]) {
                info[v][j][0] = info[v][j][1] = sz;
                sz++;
            } else {
                info[v][j][0] = info[v][j][1] = info[v][j - 1][0];
            }
        }
        SZ[v] = sz;
        return;
    }
    int tm = (tl + tr) / 2;
    build(2 * v, tl, tm);
    build(2 * v + 1, tm + 1, tr);
    merge(v, tl, tm, tr);
}

int calc() {
    return SZ[1] + cnt_other[1];
}

void upd(int v, int tl, int tr, int pos) {
    if (tl == tr) {
        cnt_other[v] = 0;
        int sz = 0;
        for (int j = 1; j <= m; j++) {
            if (j == 1 || tp[tl][j] != tp[tl][j - 1]) {
                info[v][j][0] = info[v][j][1] = sz;
                sz++;
            } else {
                info[v][j][0] = info[v][j][1] = info[v][j - 1][0];
            }
        }
        SZ[v] = sz;
        return;
    }
    int tm = (tl + tr) / 2;
    if (pos <= tm) {
        upd(2 * v, tl, tm, pos);
    } else {
        upd(2 * v + 1, tm + 1, tr, pos);
    }
    merge(v, tl, tm, tr);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifdef DEBUG
    freopen("input.txt", "r", stdin);
#endif
    cin >> n >> m >> q;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            char c;
            cin >> c;
            if (c == '1') tp[i][j] = 1;
        }
    }
    build(1, 1, n);
    int op = calc();
    while (q--) {
        int x, y;
        cin >> x >> y;
        x ^= op;
        y ^= op;
        tp[x][y] ^= 1;
        upd(1, 1, n, x);
        op = calc();
        cout << op << '\n';
    }
    return 0;
}