Compilare: user.cpp: In function ‘void back(char, char, char, char)’: user.cpp:16:6: warning: array subscript has type ‘char’ [-Wchar-subscripts] { s[k]=s[k-1]+p[n-k+1][val]; ^ user.cpp:16:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] { s[k]=s[k-1]+p[n-k+1][val]; ^ user.cpp:17:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[k]<smin) ^ user.cpp:18:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] { x[k]=val; ^ user.cpp:19:8: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[lin][col]=0; ^ user.cpp:19:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[lin][col]=0; ^ user.cpp:32:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[lin][col]=x[k]; ^ user.cpp:32:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[lin][col]=x[k]; ^ user.cpp:32:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[lin][col]=x[k]; ^ user.cpp: In function ‘int main()’: user.cpp:41:28: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘char*’ [-Wformat=] { scanf("%d",&v[i][j]); ^ user.cpp:58:24: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘int’ [-Wformat=] printf("%ld\n",smin); ^ user.cpp:37:29: warning: unused variable ‘w’ [-Wunused-variable] short i,j,r,l,c,lp,cp,t,w; ^ user.cpp:38:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma3.in","r",stdin); freopen("suma3.out","w",stdout); ^ user.cpp:38:67: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma3.in","r",stdin); freopen("suma3.out","w",stdout); ^ user.cpp:39:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp:41:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { scanf("%d",&v[i][j]); ^