Compilare: user.cpp: In function ‘void solveTest(FILE*, FILE*)’: user.cpp:73:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(var[ch] == -1) { ^ user.cpp:74:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] var[ch] = lastvar; ^ user.cpp:77:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] expr1[top++] = var[ch]; ^ user.cpp:88:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(var[ch] == -1) { ^ user.cpp:89:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] var[ch] = lastvar; ^ user.cpp:92:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] expr2[top++] = var[ch]; ^ user.cpp: In function ‘int main()’: user.cpp:118:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^