Compilare: main.cpp: In function 'int main()': main.cpp:71:14: warning: array subscript has type 'char' [-Wchar-subscripts] charId[ch] = k++; ^ main.cpp:79:34: warning: array subscript has type 'char' [-Wchar-subscripts] linChar[charId[matr[l][c]]] = l; ^ main.cpp:80:34: warning: array subscript has type 'char' [-Wchar-subscripts] colChar[charId[matr[l][c]]] = c; ^ main.cpp:64:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &c, &n, &m); ^