Compilare: user.cpp: In function ‘int main()’: user.cpp:31:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &nrlin, &nrcol); ^ user.cpp:40:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &m[i][j]); ^ user.cpp:64:42: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d %d\n", lin-1, col-1); ^ user.cpp:64:42: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized]