3 August

P1013 hex digits

Conclusion: The addition will be for \ (n-1 \) hex; \ ({(-n-1)} ^ 1 \) bits must be a digital 1; \ (0 + 0 = 0 \) .

Analog string.

#include <cstdio>
#include <map>
#include <cstring>
using namespace std;

int n, num[11], id[11], tab[11][11];
map<char, int> p;
map<int, char> q;
char s[3];

bool check() {
    for (int i=1; i<n; ++i) for (int j=1; j<n; ++j) 
        if (tab[i][j]!=id[(num[i]+num[j])%(n-1)]) return false;
    return true;
}

int main() {
    memset(num, -1, sizeof num);
    scanf("%d", &n); scanf("%s", s);
    for (int i=1; i<n; ++i) {
        scanf("%s", s); p[s[0]]=i, q[i]=s[0];
    }
    for (int i=1; i<n; ++i) {
        scanf("%s", s); int k=p[s[0]];
        for (int j=1; j<n; ++j) {
            scanf("%s", s);
            if (s[1]) num[id[1]=p[s[0]]]=1, tab[k][j]=p[s[1]];
            else tab[k][j]=p[s[0]];
        }
    }
    for (int i=1; i<n; ++i) if (tab[i][i]==i) num[id[0]=i]=0;
    int k=1;
    while (tab[id[1]][id[k]]!=id[0]) {
        num[id[k+1]=tab[id[1]][id[k]]]=k+1; ++k;
        if (k>n-1) break;
    }
    if (check()) {
        for (int i=1; i<n; ++i) printf("%c=%d ", q[i], num[i]);
        printf("\n%d\n", n-1);
    } else printf("ERROR!\n");
    return 0;
}