Compilare: user.cpp: In function ‘void solveTest(FILE*, FILE*)’: user.cpp:75:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(var[ch] == -1) { ^ user.cpp:76:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] var[ch] = lastvar; ^ user.cpp:79:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] expr1[top++] = var[ch]; ^ user.cpp:80:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] col1 = col1 | (1 << var[ch]); ^ user.cpp:91:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(var[ch] == -1) { ^ user.cpp:92:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] var[ch] = lastvar; ^ user.cpp:95:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] expr2[top++] = var[ch]; ^ user.cpp:96:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] col2 = col2 | (1 << var[ch]); ^ user.cpp: In function ‘int main()’: user.cpp:122:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^