This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int kon(char z) {
return (int)z - 65;
}
int l[30][30];
int p[30][30];
int g[30][30];
int d[30][30];
int c[30][30][30][30];
int gp[30][30][30];
int dl[30][30][30];
int lg[30][30][30];
int pd[30][30][30];
int main() {
int n;
cin >> n;
int ans = 0;
for(int i = 1; i <= n; i++) {
char tmp1, tmp2, tmp3, tmp4;
cin >> tmp1 >> tmp2 >> tmp3 >> tmp4;
int z1 = kon(tmp1);
int z2 = kon(tmp2);
int z3 = kon(tmp3);
int z4 = kon(tmp4);
ans += d[z1][z2];
ans += l[z2][z4];
ans += g[z3][z4];
ans += p[z1][z3];
if(z1 == z4) {
ans -= dl[z2][z1][z2];
ans -= gp[z3][z1][z3];
}
if(z2 == z3) {
ans -= lg[z4][z2][z4];
ans -= pd[z1][z2][z1];
}
if(z1 == z4 && z2 == z3) {
ans += 3 * c[z2][z1][z1][z2];
}
ans -= c[z2][z1][z4][z3];
ans -= c[z3][z4][z1][z2];
g[z1][z2]++;
p[z2][z4]++;
d[z3][z4]++;
l[z1][z3]++;
lg[z3][z1][z2]++;
gp[z1][z2][z4]++;
pd[z2][z4][z3]++;
dl[z4][z3][z1]++;
c[z1][z2][z3][z4]++;
}
printf("%d\n", ans);
}
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