12416.cpp

#include <bits/stdc++.h>
const int max = 1000000;
int main() {
    char a[max], b[max];
    int i, j, k, l, last, count;
    while (gets(a)) {
        l = 0;
        count = 1;
        while (count != 0) {
            count = 0;
            last = 0;
            j = 0;
            for (i = 0; a[i] != '\0'; i++) {
                if (a[i] == ' ') {
                    if (last == 0) {
                        last = 1;
                        b[j] = ' ';
                        j++;
                    }

                    else {
                        last = 0;
                        count = 1;
                    }
                } else {
                    last = 0;
                    b[j] = a[i];
                    j++;
                }
            }
            if (count == 1) l++;
            b[j] = '\0';
            strcpy(a, b);
        }
        printf("%d\n", l);
    }
    return 0;
}