Compilare: user.cpp: In function ‘int main()’: user.cpp:67:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] P[L[i]][C[i]] = K; ^ user.cpp:67:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] P[L[i]][C[i]] = K; ^ user.cpp:84:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (S[j]<min) { ^ user.cpp:96:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (W[i]>Max) { ^ user.cpp:47:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&N, &M); ^ user.cpp:50:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^