Compilare: user.cpp: In function ‘int main()’: user.cpp:29:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&n); ^ user.cpp:32:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&mat[i][j]); ^ user.cpp:52:22: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] j=nextc[l][c]; ^ user.cpp:52:22: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized]