C++ error: expected identifier before “(” token

In these if statements there are absent external parentheses

for (int i=1;i<=m;i++) if (A[i]>minim) && (A[i]<maxim) nn1++;
for (int j=1;j<=n;j++) if (B[j]>minim) && (B[j]<maxim) nn2++;

I think that there should be

for (int i=1;i<=m;i++) if ( (A[i]>minim) && (A[i]<maxim) ) nn1++;
for (int j=1;j<=n;j++) if ( (B[j]>minim) && (B[j]<maxim) ) nn2++;

And the loops look suspeciously. Take into account that array indices start from 0. So for example if you have an array of size N then the valid range of indices is [0, N-1]

And you forgot to initialize nn1 and nn2.

It seems that you mean the following

int nn1 = 0, nn2 = 0;

for ( int i = 0; i < m; i++ ) 
{
    if ( ( A[i] > minim ) && ( A[i] < maxim ) ) nn1++;
}

for ( int i = 0; i < n; i++ ) 
{
    if ( ( B[i] > minim ) && ( B[i] < maxim ) ) nn2++;
}

if ( nn1 > nn2 ) cout << "1";
else if ( nn1 < nn2 ) cout << "2";
else cout << "0";

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