Compilare: main.cpp: In function 'int main()': main.cpp:32:12: warning: array subscript has type 'char' [-Wchar-subscripts] 32 | fr[c] ++; | ^ main.cpp:25:15: warning: 'nrdif' may be used uninitialized [-Wmaybe-uninitialized] 25 | int n, i, nrdif, nrrepet; | ^~~~~ main.cpp:55:24: warning: 'nrrepet' may be used uninitialized [-Wmaybe-uninitialized] 55 | nr = ( nrrepet * n * ( n - 1 ) / 2 ) % MOD; | ~~~~~~~~^~~ main.cpp:25:22: note: 'nrrepet' was declared here 25 | int n, i, nrdif, nrrepet; | ^~~~~~~