Compilare: user.cpp: In function ‘int main()’: user.cpp:21:49: warning: operation on ‘K’ may be undefined [-Wsequence-point] case 'W': { D1[++K] = D1[K - 1] + nr; cnt++; break; } ^ user.cpp:29:49: warning: operation on ‘K’ may be undefined [-Wsequence-point] case 'W': { D2[++K] = D2[K - 1] + nr; break; } ^ user.cpp:15:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %s", &N, S + 1 ); ^